Merge pull request #19 from theupriser/feat/hdmi-refresh-boost

Feat/hdmi refresh boost

AGENTS.md

@@ -142,7 +142,7 @@ gamescope and the Plasma desktop. Primary target: the Valve Steam Machine
   `steam-set-session plasma.desktop` plus the plasmalogin sync bridge when it
   exists, at every boot. CachyOS's `cachyos-gamescope-autologin` still sets
   gamescope during each desktop session; the unit corrects it at boot.
-- `bios` is an *action* (`ACTIONS` in `lib/menu.sh`), not an on/off
+- `bios` is an *action* (`ACTIONS` in `lib/menu.sh`) and a sub-option of `machine`, not an on/off
   component: never preselected (not even on a first run), never re-applied
   by `a`, not listed in the state overview, and `bios_status` is always off.
   Only selectable when Valve's version differs from the installed one
@@ -171,6 +171,15 @@ gamescope and the Plasma desktop. Primary target: the Valve Steam Machine
   The start script closes its window after a 10-second countdown on success
   and waits for Enter after an error; it uses `pipefail`, or a failed
   download would run an empty script and count as success.
+- HDMI refresh boost (`hdmi`, `lib/hdmi-refresh.sh`): a sub-option of
+  `machine` (like `kpin` and `bios`), only on Fremont with the pinned kernel
+  (stays visible while on); unticking `kpin` unticks it. It needs someone at the
+  screen: the graphical app's backend (`BACKEND=true`) must refuse it, and every step needs a "y" within 15 s
+  (`WIZARD_HDMI_CONFIRM_SECONDS` for scripted tests). debugfs is root-only
+  (glob it under sudo), and `edid_override` takes exactly `reset` with no
+  newline. Build the EDID from the DDC read, not from sysfs: a live override
+  replaces the kernel's copy. The kernel command-line value holds a path, so
+  `sed` uses `|` as its delimiter.
 - `Relogin=true` means a gamescope that fails to start is relaunched in a
   tight loop; keep that in mind when changing session handling.
 

CHANGELOG.md

@@ -5,6 +5,21 @@ All notable changes, per version and per commit. Versions follow
 `steamify.sh`. Versions before 0.7.0 were numbered afterwards,
 one per merged pull request.
 
+## 1.2.0 - 2026-09-25
+
+- **feat: HDMI refresh boost (Steam Machine, pinned kernel)**
+  - The pinned 7.1.6 kernel doesn't read the extra EDID block where monitors
+    list their fast modes, and does no HDMI 2.1, so HDMI displays often stay
+    at 60 Hz. The new menu item reads the display's EDID over DDC,
+    calculates the highest rate that fits HDMI 2.0 at the desktop resolution
+    (rounded down to ten, plus the hundred below as a safe option), tests
+    each step live with a confirmation, and makes the confirmed ones
+    permanent through `drm.edid_firmware` (Limine, sdboot-manage or GRUB).
+- **feat: HDMI refresh boost and Update BIOS under Steam Machine support**
+  - Both are sub-options now, shown only while Steam Machine support is
+    ticked. Unticking it unticks them; unticking the kernel pin unticks the
+    HDMI refresh boost.
+
 ## 1.1.4 - 2026-09-25
 
 - **fix: No lock screen in single user mode before a restart**

README.md

@@ -50,9 +50,15 @@ What Steamify can do on a Valve Steam Machine:
     [release](https://github.com/theupriser/steamify-cachyos/releases/tag/kernel-7.1.6-1),
     checked against CachyOS's signature
     ([details](TECHNICAL.md#kernel-pin-steam-machine)).
-- **Update BIOS** - installs Valve's newest Steam Machine BIOS. Never ticked
-  by default, at your own risk, and only after two warnings
-  ([details](TECHNICAL.md#bios-updates-steam-machine)).
+  - **HDMI refresh boost** - only with the pinned kernel, never ticked by
+    default: gets the highest refresh rate your HDMI display runs at the
+    desktop resolution (e.g. 110 Hz instead of 60 on a 3440x1440 monitor).
+    Each step is shown and you confirm it; no answer within 15 s switches
+    back. For more (e.g. 175 Hz), use DisplayPort
+    ([details](TECHNICAL.md#hdmi-refresh-boost-steam-machine)).
+  - **Update BIOS** - installs Valve's newest Steam Machine BIOS. Never ticked
+    by default, at your own risk, and only after two warnings
+    ([details](TECHNICAL.md#bios-updates-steam-machine)).
 
 ## Requirements
 

TECHNICAL.md

@@ -229,6 +229,48 @@ into the kernel directory yourself.
 Unticking it removes the pin and runs `sudo pacman -Syu`, which brings the
 kernel back to CachyOS's current version; the files stay for next time.
 
+## HDMI refresh boost (Steam Machine)
+
+With the pinned kernel (7.1.6), HDMI displays often stay at 60 Hz. Two
+reasons:
+
+- Monitors list their fast modes in an extra EDID block, announced by the
+  HDMI Forum EEODB data block. 7.1.6 only reads the first extension block,
+  so it never sees them. Newer kernels do.
+- Their fastest modes need HDMI 2.1 (FRL). 7.1.6's amdgpu only does HDMI
+  2.0 (TMDS, at most 600 MHz), but a mode with the display's own shortest
+  blanking at a slightly lower rate often fits.
+
+The menu item (only on a Steam Machine with the pinned kernel, never
+ticked by default, run from the desktop in Konsole):
+
+1. Takes the desktop resolution from KDE (`kscreen-doctor -j`) and reads the
+   display's complete EDID over DDC (`i2ctransfer`, segment pointer 0x30).
+   A live EDID left by an earlier test is cleared first.
+2. Calculates the highest rate that fits: the display's TMDS limit (HDMI
+   Forum VSDB, capped at amdgpu's 600 MHz), its shortest blanking at that
+   resolution and its maximum refresh (range limits, VRR maximum). Steps:
+   that rate rounded down to ten, and the hundred below it as a safe option.
+   Rates the display already lists, or that aren't faster than what works
+   now, are left out.
+3. Builds the EDID: all of the display's blocks, the block count and EEODB
+   fixed, plus a DisplayID block with the steps.
+4. Loads it live (debugfs `edid_override`, `trigger_hotplug`) and switches
+   to each step, lowest first. Each one needs a "y" within 15 s
+   (`WIZARD_HDMI_CONFIRM_SECONDS` for tests); anything else switches back
+   and stops.
+5. Makes it permanent with only the confirmed steps:
+   `/usr/lib/firmware/edid/steamify-<connector>.bin`, in the initramfs via
+   `/etc/mkinitcpio.conf.d/90-steamify-edid.conf` (amdgpu loads from there),
+   and `drm.edid_firmware=<connector>:edid/steamify-<connector>.bin` on the
+   kernel command line: `/etc/default/limine` (`limine-mkinitcpio`),
+   `/etc/sdboot-manage.conf` or `/etc/default/grub`.
+
+The display's manufacturer, model and serial are stored; re-applying with
+another display connected tests that one instead. Turning it off removes
+the files and the parameter and rebuilds. Untick it before removing the
+kernel pin: newer kernels read the EDID themselves and can do HDMI 2.1.
+
 ## BIOS updates (Steam Machine)
 
 The **Update BIOS** item is only shown on a Steam Machine and is never ticked
@@ -298,6 +340,7 @@ immediately, which can turn into a loop - see
 | `lib/bios.sh` | Update BIOS (Steam Machine, opt-in): current/newest version, double confirmation, fwupd |
 | `lib/cec.sh` | HDMI-CEC: Valve's `cecd` and friends from its `holo` repository |
 | `lib/steam-machine.sh` | Steam Machine support: LED driver, LED access, steamos-manager; kernel pin |
+| `lib/hdmi-refresh.sh` | HDMI refresh boost (Steam Machine, pinned kernel): EDID over DDC, calculated steps, live test, `drm.edid_firmware` |
 | `.github/tools/bundle.sh` | Builds the single-file version (`dist/steamify.sh`) |
 | `.github/workflows/bundle.yml` | Builds and checks it on every push; publishes it on `main` |
 

lib/hdmi-refresh.sh

@@ -0,0 +1,438 @@
+#!/bin/bash
+# "HDMI refresh boost" menu item, Steam Machine (Fremont) only: finds the
+# highest refresh rate the display runs at the desktop resolution over HDMI,
+# tests it live and makes it permanent with an EDID override
+# (drm.edid_firmware). Two things keep displays below what they can do:
+# - Monitors put their fast modes in an extra EDID block (HDMI Forum EEODB);
+#   the pinned kernel (7.1.6) only reads the first extension. Newer kernels
+#   do, and do HDMI 2.1, so it's only offered with the pinned kernel.
+# - Their fastest modes need HDMI 2.1 (FRL), which amdgpu doesn't do on
+#   every kernel; a mode with the display's shortest blanking at a slightly
+#   lower rate often still fits HDMI 2.0's TMDS limit (600 MHz).
+# What a display claims isn't what it accepts: every step is shown and must
+# be confirmed, and no answer within 15 s switches back (the screen may be
+# black). Sourced by steamify.sh; not meant to be run on its own.
+
+HDMI_FW_DIR=/usr/lib/firmware/edid
+HDMI_INITRAMFS_CONF=/etc/mkinitcpio.conf.d/90-steamify-edid.conf
+# No answer within this time switches back; longer for scripted tests.
+HDMI_CONFIRM_SECONDS="${WIZARD_HDMI_CONFIRM_SECONDS:-15}"
+# amdgpu's HDMI 2.0 limit; the display's own limit (from its EDID) may be lower.
+HDMI_TMDS_MAX_KHZ=600000
+
+hdmi_connectors() {
+    # Connected HDMI outputs, as "<card>-<connector>" (e.g. card1-HDMI-A-1).
+    local d
+    for d in /sys/class/drm/card*-HDMI-A-*; do
+        [[ "$(cat "$d/status" 2>/dev/null)" == connected ]] && basename "$d"
+    done
+}
+
+hdmi_boot_file() {
+    # The file holding the kernel command line, per boot loader.
+    if [[ -f /etc/default/limine ]]; then echo /etc/default/limine
+    elif [[ -f /etc/sdboot-manage.conf ]] && command -v sdboot-manage >/dev/null; then echo /etc/sdboot-manage.conf
+    elif [[ -f /etc/default/grub ]]; then echo /etc/default/grub
+    fi
+}
+
+hdmi_cmdline_param() {
+    # The drm.edid_firmware= value we set, or nothing.
+    local f; f="$(hdmi_boot_file)"
+    [[ -n "$f" ]] && grep -oE 'drm\.edid_firmware=[^ "]*steamify-[^ "]*' "$f" 2>/dev/null | head -n 1
+}
+
+hdmi_available() {
+    # Stays available while on, so it can be turned off after the pin is gone.
+    detect_valve_fremont || return 1
+    hdmi_status || { pinned_kernel_installed && [[ -n "$(hdmi_connectors)" && -n "$(hdmi_boot_file)" ]]; }
+}
+
+hdmi_status() { [[ -n "$(hdmi_cmdline_param)" ]] && compgen -G "$HDMI_FW_DIR/steamify-*.bin" >/dev/null; }
+
+hdmi_edid_tool() {
+    # hdmi_edid_tool <command> ...: EDID parsing and building (python, as
+    # it's byte work). Commands:
+    #   blocks <edid>                number of blocks the display says it has
+    #   id <edid>                    vendor/product/serial, to recognise it
+    #   plan <edid> <w> <h> <cur_hz> "<limit_hz> <best> <step>..." for w x h
+    #   build <in> <out> <w> <h> <hz>...  full EDID plus a DisplayID block
+    #                                with those rates at the shortest blanking
+    python3 - "$HDMI_TMDS_MAX_KHZ" "$@" <<'PY'
+import sys
+
+src_khz = int(sys.argv[1]); cmd = sys.argv[2]; args = sys.argv[3:]
+def load(p): return bytearray(open(p, 'rb').read())
+def le(b): return int.from_bytes(b, 'little')
+
+def cta_blocks(e):
+    for i in range(128, len(e), 128):
+        if e[i] == 0x02: yield i
+
+def data_blocks(e, i):
+    # CTA data block collection: (tag, extended tag, offset, length)
+    end, p = e[i + 2], i + 4
+    while p < i + end and p < i + 127:
+        tag, n = e[p] >> 5, e[p] & 0x1f
+        yield tag, (e[p + 1] if tag == 7 and n else None), p, n
+        p += n + 1
+
+def eeodb(e):
+    for i in cta_blocks(e):
+        for tag, ext, p, n in data_blocks(e, i):
+            if tag == 7 and ext == 0x78: return p + 2
+    return None
+
+def nblocks(e):
+    p = eeodb(e)
+    return 1 + max(e[126], e[p] if p and p < len(e) else 0)
+
+def timings(e):
+    # (hz, clk_khz, ha, hb, hf, hs, hpos, va, vb, vf, vs, vpos)
+    out = []
+    def dtd(b):
+        clk = le(b[0:2]) * 10
+        if not clk: return
+        ha = b[2] | (b[4] >> 4) << 8; hb = b[3] | (b[4] & 15) << 8
+        va = b[5] | (b[7] >> 4) << 8; vb = b[6] | (b[7] & 15) << 8
+        hf = b[8] | (b[11] >> 6 & 3) << 8; hs = b[9] | (b[11] >> 4 & 3) << 8
+        vf = (b[10] >> 4) | (b[11] >> 2 & 3) << 4; vs = (b[10] & 15) | (b[11] & 3) << 4
+        if b[17] & 0x80: return  # interlaced
+        out.append((clk * 1000 / ((ha + hb) * (va + vb)), clk, ha, hb, hf, hs, b[17] >> 1 & 1,
+                    va, vb, vf, vs, b[17] >> 2 & 1))
+    for o in range(54, 126, 18): dtd(e[o:o + 18])
+    for i in cta_blocks(e):
+        d = e[i + 2]
+        if d >= 4:
+            for o in range(i + d, i + 127 - 17, 18): dtd(e[o:o + 18])
+    for i in range(128, len(e), 128):
+        if e[i] != 0x70: continue
+        p, end = i + 5, i + 5 + e[i + 2]
+        while p + 3 <= end:
+            tag, n = e[p], e[p + 2]
+            if tag == 0 and n == 0: break
+            if tag == 0x03:
+                for o in range(p + 3, p + 3 + n - 19, 20):
+                    b = e[o:o + 20]
+                    clk = (le(b[0:3]) + 1) * 10
+                    hf, vf = le(b[8:10]), le(b[16:18])
+                    ha, hb, va, vb = le(b[4:6]) + 1, le(b[6:8]) + 1, le(b[12:14]) + 1, le(b[14:16]) + 1
+                    out.append((clk * 1000 / ((ha + hb) * (va + vb)), clk, ha, hb, (hf & 0x7fff) + 1,
+                                le(b[10:12]) + 1, hf >> 15, va, vb, (vf & 0x7fff) + 1, le(b[18:20]) + 1, vf >> 15))
+            p += 3 + n
+    return out
+
+def tmds_khz(e):
+    # The display's own TMDS limit: HDMI Forum VSDB, else the HDMI 1.4 VSDB.
+    hf = h14 = 0
+    for i in cta_blocks(e):
+        for tag, ext, p, n in data_blocks(e, i):
+            if tag != 3 or n < 3: continue
+            oui = e[p + 3] << 16 | e[p + 2] << 8 | e[p + 1]
+            if oui == 0xC45DD8 and n >= 5: hf = e[p + 5] * 5000
+            if oui == 0x000C03 and n >= 7: h14 = e[p + 7] * 5000
+    lim = hf or h14 or 165000
+    return min(lim, src_khz)
+
+def max_vrefresh(e):
+    # Range limits descriptor, the HDMI Forum / AMD VRR maximum.
+    best = 0
+    for o in range(54, 126, 18):
+        b = e[o:o + 18]
+        if b[0:3] == b'\0\0\0' and b[3] == 0xfd:
+            best = max(best, b[6] + (255 if b[4] & 2 else 0))
+    for i in cta_blocks(e):
+        for tag, ext, p, n in data_blocks(e, i):
+            if tag != 3 or n < 3: continue
+            oui = e[p + 3] << 16 | e[p + 2] << 8 | e[p + 1]
+            if oui == 0xC45DD8 and n >= 10: best = max(best, (e[p + 9] & 0xc0) << 2 | e[p + 10])
+            if oui == 0x00001A and n >= 7: best = max(best, e[p + 7])
+    return best
+
+def shortest(e, w, h):
+    ts = [t for t in timings(e) if t[2] == w and t[7] == h]
+    return min(ts, key=lambda t: (t[2] + t[3]) * (t[7] + t[8])) if ts else None
+
+if cmd == 'blocks':
+    print(nblocks(load(args[0])))
+elif cmd == 'id':
+    print(load(args[0])[8:18].hex())
+elif cmd == 'plan':
+    e = load(args[0]); w, h, cur = int(args[1]), int(args[2]), float(args[3])
+    lim, t = tmds_khz(e), shortest(e, w, h)
+    if not t: sys.exit(1)
+    listed = [x[0] for x in timings(e) if x[2] == w and x[7] == h and x[1] <= lim]
+    best = max(listed) if listed else cur
+    top = int(lim * 1000 // ((t[2] + t[3]) * (t[7] + t[8])))
+    vmax = max_vrefresh(e) or int(max(x[0] for x in timings(e) if x[2] == w and x[7] == h))
+    top = min(top, vmax)
+    # Not right at the limit: the top rounded down to ten, and the hundred
+    # below it as a safe option. Rates the display already lists are left
+    # out (its own timing is the safer one), and so is anything not faster
+    # than what already works.
+    steps = sorted({top // 10 * 10, top // 100 * 100})
+    steps = [s for s in steps if s > best + 1 and not any(abs(s - x) < 1 for x in listed)]
+    print(lim // 1000, round(best, 2), *steps)
+elif cmd == 'build':
+    e = load(args[0]); w, h = int(args[2]), int(args[3]); rates = [int(r) for r in args[4:]]
+    t = shortest(e, w, h)
+    n = nblocks(e)
+    e = e[:n * 128]
+    out = b''
+    for hz in rates:
+        _, _, ha, hb, hf, hs, hp, va, vb, vf, vs, vp = t
+        clk = round((ha + hb) * (va + vb) * hz / 1e4)
+        x = (clk - 1).to_bytes(3, 'little') + bytes([0x08])
+        for v, pol in ((ha, 0), (hb, 0), (hf, hp), (hs, 0), (va, 0), (vb, 0), (vf, vp), (vs, 0)):
+            x += ((v - 1) | pol << 15).to_bytes(2, 'little')
+        out += x
+    if out:
+        blk = bytearray(128)
+        blk[0:5] = bytes([0x70, 0x12, 121, 0x00, 0x00])
+        blk[5:8] = bytes([0x03, 0x00, len(out)])
+        blk[8:8 + len(out)] = out
+        blk[126] = (-sum(blk[1:126])) % 256
+        blk[127] = (-sum(blk[:127])) % 256
+        e += blk
+    count = len(e) // 128 - 1
+    e[126] = count
+    e[127] = (-sum(e[:127])) % 256
+    p = eeodb(e)
+    if p:
+        e[p] = count
+        i = p - p % 128
+        e[i + 127] = (-sum(e[i:i + 127])) % 256
+    open(args[1], 'wb').write(e)
+PY
+}
+
+hdmi_read_edid() {
+    # hdmi_read_edid <card-connector> <out>: the display's complete EDID,
+    # read over DDC block by block (the kernel's copy may miss blocks).
+    local conn="$1" out="$2" bus n i tmp
+    bus="$(basename "$(readlink -f "/sys/class/drm/$conn/ddc")")"; bus="${bus#i2c-}"
+    tmp="$(mktemp)"
+    cat "/sys/class/drm/$conn/edid" > "$out"
+    if [[ -n "$bus" ]] && sudo modprobe i2c-dev 2>/dev/null; then
+        n="$(hdmi_edid_tool blocks "$out")"
+        : > "$tmp"
+        for (( i = 0; i < n; i++ )); do
+            # Segment pointer (0x30) selects each pair of blocks.
+            sudo i2ctransfer -y "$bus" w1@0x30 $(( i / 2 )) w1@0x50 $(( (i % 2) * 128 )) r128@0x50 2>/dev/null |
+                xxd -r -p >> "$tmp" 2>/dev/null ||
+                { [[ $i -lt 2 ]] && { sudo i2ctransfer -y "$bus" w1@0x50 $(( i * 128 )) r128@0x50 | xxd -r -p >> "$tmp"; }; } || break
+        done
+        # Keep the DDC copy only when it's whole and the same display as the
+        # kernel's (not the whole block: a live override changes it).
+        if [[ "$(stat -c %s "$tmp")" == $(( n * 128 )) &&
+            "$(hdmi_edid_tool id "$tmp")" == "$(hdmi_edid_tool id "$out")" ]]; then
+            cat "$tmp" > "$out"
+        fi
+    fi
+    rm -f "$tmp"
+}
+
+hdmi_debugfs() {
+    # debugfs directory of a connector (one of several paths to the same
+    # GPU). Only root can list debugfs, so the glob runs under sudo.
+    local d
+    d="$(sudo sh -c 'for d in /sys/kernel/debug/dri/*/"$1"; do [ -e "$d/edid_override" ] && { echo "$d"; break; }; done' _ "${1#card*-}")"
+    [[ -n "$d" ]] && echo "$d"
+}
+
+hdmi_override_live() {
+    # hdmi_override_live <card-connector> <edid|reset>: swap the EDID the
+    # kernel uses right now, without a restart.
+    local d; d="$(hdmi_debugfs "$1")" || return 1
+    # The kernel takes exactly "reset", without a newline.
+    if [[ "$2" == reset ]]; then printf reset | sudo tee "$d/edid_override" >/dev/null
+    else sudo tee "$d/edid_override" < "$2" >/dev/null; fi || return 1
+    echo 1 | sudo tee "$d/trigger_hotplug" >/dev/null
+    sleep 3
+}
+
+hdmi_kscreen() {
+    # hdmi_kscreen current|mode <output> [<w> <h> <hz>]: KDE's view of the
+    # output: "w h hz" of the current mode, or set the mode closest to hz.
+    kscreen-doctor -j 2>/dev/null | python3 -c '
+import json, sys
+what, name = sys.argv[1], sys.argv[2]
+for o in json.load(sys.stdin)["outputs"]:
+    if o["name"] != name: continue
+    modes = {m["id"]: m for m in o["modes"]}
+    if what == "current":
+        m = modes[o["currentModeId"]]
+        print(m["size"]["width"], m["size"]["height"], round(m["refreshRate"], 2))
+    else:
+        w, h, hz = int(sys.argv[3]), int(sys.argv[4]), float(sys.argv[5])
+        ms = [m for m in o["modes"] if m["size"]["width"] == w and m["size"]["height"] == h]
+        if ms: print(min(ms, key=lambda m: abs(m["refreshRate"] - hz))["id"])
+' "$@"
+}
+
+hdmi_set_mode() {
+    # hdmi_set_mode <output> <w> <h> <hz>: returns 1 if KDE has no such mode.
+    local id rate
+    id="$(hdmi_kscreen mode "$@")" || return 1
+    [[ -n "$id" ]] || return 1
+    kscreen-doctor "output.$1.mode.$id" >/dev/null 2>&1 || return 1
+    sleep 2
+    rate="$(hdmi_kscreen current "$1" | cut -d' ' -f3)"
+    [[ "${rate%.*}" -ge $(( $4 - 1 )) ]]
+}
+
+hdmi_confirm() {
+    # No answer (black screen, nobody there) is a no.
+    local reply
+    read -rt "$HDMI_CONFIRM_SECONDS" -p "$(echo -e "${c_bold}$1${c_reset} [y/N, ${HDMI_CONFIRM_SECONDS}s] ")" reply || { echo; return 1; }
+    [[ "$reply" =~ ^[Yy]$ ]]
+}
+
+hdmi_boot_param() {
+    # hdmi_boot_param <value|"">: set or remove our drm.edid_firmware= in
+    # the boot loader's command line, then rebuild the initramfs and entries.
+    local f value="$1"
+    f="$(hdmi_boot_file)" || return 1
+    [[ -n "$f" ]] || { err "No supported boot loader (Limine, systemd-boot with sdboot-manage, GRUB) found."; return 1; }
+    backup_file "$f"
+    sudo sed -i -E 's/drm\.edid_firmware=[^ "]*steamify-[^ "]* ?//' "$f"
+    if [[ -n "$value" ]]; then
+        case "$f" in
+            # | as delimiter: the value holds a path.
+            /etc/default/limine) sudo sed -i -E "0,\|^KERNEL_CMDLINE\[default\]\+?=\"|s||&$value |" "$f" ;;
+            /etc/sdboot-manage.conf) sudo sed -i -E "0,\|^LINUX_OPTIONS=\"|s||&$value |" "$f" ;;
+            /etc/default/grub) sudo sed -i -E "0,\|^GRUB_CMDLINE_LINUX_DEFAULT=\"|s||&$value |" "$f" ;;
+        esac
+        grep -qF "$value" "$f" || { err "Couldn't add $value to $f."; return 1; }
+    fi
+    info "Rebuilding the initramfs and boot entries..."
+    case "$f" in
+        /etc/default/limine) sudo limine-mkinitcpio ;;
+        /etc/sdboot-manage.conf) sudo /usr/bin/mkinitcpio -P && sudo sdboot-manage gen ;;
+        /etc/default/grub) sudo /usr/bin/mkinitcpio -P && sudo grub-mkconfig -o /boot/grub/grub.cfg ;;
+    esac
+}
+
+hdmi_tune() {
+    # hdmi_tune <card-connector> <tmpdir>: find and confirm the highest rate
+    # at the desktop resolution. Sets HDMI_RESULT to "<w> <h> <hz>..." (the
+    # confirmed new rates) or leaves it empty.
+    local conn="$1" tmp="$2" out="${1#card*-}" cur w h hz plan lim best steps_str
+    local -a steps ok_rates=()
+    HDMI_RESULT=""
+    # From the display's own EDID: a live one left by an earlier test would
+    # make its rates look like what the display already does.
+    hdmi_override_live "$conn" reset 2>/dev/null
+    cur="$(hdmi_kscreen current "$out")"
+    [[ -n "$cur" ]] || { warn "$out: KDE doesn't show this output; skipped."; return 0; }
+    read -r w h hz <<< "$cur"
+    info "$out: desktop resolution ${w}x${h} at ${hz} Hz. Reading the display's EDID..."
+    hdmi_read_edid "$conn" "$tmp/$out.orig" || return 1
+    if ! plan="$(hdmi_edid_tool plan "$tmp/$out.orig" "$w" "$h" "$hz")"; then
+        warn "$out: the display lists no timing for ${w}x${h}; nothing to calculate."
+        return 0
+    fi
+    read -r lim best steps_str <<< "$plan"
+    read -ra steps <<< "${steps_str:-}"
+    info "$out: HDMI limit ${lim} MHz, fastest mode that fits now: ${best} Hz."
+    if [[ ${#steps[@]} -eq 0 ]]; then
+        ok "$out: already at the highest rate that fits HDMI here; nothing to change."
+        return 0
+    fi
+    info "$out: steps to try: ${steps[*]} Hz. After each one you're asked whether the"
+    info "picture is OK; no answer within ${HDMI_CONFIRM_SECONDS} s (e.g. a black screen) switches back."
+    ask_yn "Start the test?" y || return 0
+
+    hdmi_edid_tool build "$tmp/$out.orig" "$tmp/$out.test" "$w" "$h" "${steps[@]}" &&
+        hdmi_override_live "$conn" "$tmp/$out.test" ||
+        { err "$out: couldn't load the test EDID (debugfs)."; return 1; }
+    local s
+    for s in "${steps[@]}"; do
+        info "$out: switching to ${w}x${h} at $s Hz..."
+        if hdmi_set_mode "$out" "$w" "$h" "$s" && hdmi_confirm "Is the picture OK at $s Hz?"; then
+            ok "$out: $s Hz works."
+            ok_rates+=("$s")
+        else
+            warn "$out: $s Hz doesn't work; stopping here."
+            break
+        fi
+    done
+    if [[ ${#ok_rates[@]} -eq 0 ]]; then
+        hdmi_override_live "$conn" reset
+        hdmi_set_mode "$out" "$w" "$h" "$hz" >/dev/null
+        info "$out: back to ${hz} Hz; nothing changed."
+        return 0
+    fi
+    # Without the steps that failed, so KDE and gamescope never pick them.
+    hdmi_edid_tool build "$tmp/$out.orig" "$tmp/$out.final" "$w" "$h" "${ok_rates[@]}" &&
+        hdmi_override_live "$conn" "$tmp/$out.final"
+    hdmi_set_mode "$out" "$w" "$h" "${ok_rates[-1]}" >/dev/null
+    HDMI_RESULT="$w $h ${ok_rates[*]}"
+}
+
+hdmi_enable() {
+    if [[ "${BACKEND:-false}" == true ]]; then
+        err "HDMI refresh boost needs you at the screen: run it from the Steamify menu in Konsole."
+        return 1
+    fi
+    if [[ "${XDG_CURRENT_DESKTOP:-}" != *KDE* ]] || ! command -v kscreen-doctor >/dev/null; then
+        err "Run this from the Plasma desktop: the test switches the display mode through KDE."
+        return 1
+    fi
+    if hdmi_status; then
+        local conn stale=false
+        for conn in $(hdmi_connectors); do
+            [[ -f "$HDMI_FW_DIR/steamify-${conn#card*-}.bin" ]] || continue
+            [[ "$(state_get hdmi "${conn#card*-}")" == "$(hdmi_edid_tool id "/sys/class/drm/$conn/edid")" ]] || stale=true
+        done
+        if [[ "$stale" == false ]]; then
+            ok "Already set up for the connected display(s). Untick and tick it again to re-test."
+            return 0
+        fi
+        warn "Set up for another display; testing the one connected now."
+        hdmi_disable || return 1
+    fi
+    sudo pacman -S --needed --noconfirm i2c-tools python >/dev/null 2>&1 || { err "Installing i2c-tools failed."; return 1; }
+
+    local tmp conn out param="" files=() rc=0
+    tmp="$(mktemp -d)"
+    for conn in $(hdmi_connectors); do
+        out="${conn#card*-}"
+        hdmi_tune "$conn" "$tmp" || { rc=1; continue; }
+        [[ -n "$HDMI_RESULT" ]] || continue
+        sudo install -Dm644 "$tmp/$out.final" "$HDMI_FW_DIR/steamify-$out.bin" || { rc=1; continue; }
+        state_set hdmi "$out" "$(hdmi_edid_tool id "$tmp/$out.orig")"
+        state_set hdmi "$out-mode" "$HDMI_RESULT"
+        param+="${param:+,}$out:edid/steamify-$out.bin"
+        files+=("$HDMI_FW_DIR/steamify-$out.bin")
+    done
+    rm -rf "$tmp"
+    [[ -n "$param" ]] || return $rc
+
+    # amdgpu loads from the initramfs (the kms hook), before the root
+    # filesystem: the EDID file has to be in there too.
+    sudo mkdir -p "$(dirname "$HDMI_INITRAMFS_CONF")"
+    printf '# Written by steamify: EDID override for HDMI refresh boost.\nFILES+=(%s)\n' "${files[*]}" |
+        sudo tee "$HDMI_INITRAMFS_CONF" >/dev/null
+    if ! hdmi_boot_param "drm.edid_firmware=$param"; then
+        # Nothing half-done left behind; the live EDID lasts until a restart.
+        sudo rm -f "$HDMI_INITRAMFS_CONF" "${files[@]}"
+        for conn in $(hdmi_connectors); do hdmi_override_live "$conn" reset 2>/dev/null; done
+        state_clear hdmi
+        err "Making it permanent failed; the display is back on its own EDID."
+        return 1
+    fi
+    ok "HDMI refresh boost is set up; it's active now and after every restart."
+    return $rc
+}
+
+hdmi_disable() {
+    local f conn
+    # Drop-in and files first: the rebuild below leaves them out.
+    sudo rm -f "$HDMI_INITRAMFS_CONF"
+    for f in "$HDMI_FW_DIR"/steamify-*.bin; do [[ -e "$f" ]] && sudo rm -f "$f"; done
+    hdmi_boot_param "" || return 1
+    for conn in $(hdmi_connectors); do hdmi_override_live "$conn" reset 2>/dev/null; done
+    state_clear hdmi
+    ok "HDMI refresh boost removed; the display uses its own EDID again."
+}

lib/menu.sh

@@ -5,17 +5,18 @@
 
 # Menu order. Components are turned on in this order and off in reverse;
 # gaming must come first (single user builds on it).
-COMPONENTS=(gaming boot theme glyphs single launcher cec machine kpin bios)
+COMPONENTS=(gaming boot theme glyphs single launcher cec machine kpin hdmi bios)
 # One-off actions rather than on/off components: never preselected, never
 # re-applied, not listed as on or off.
 ACTIONS=(bios)
 # Sub-options, shown indented under their parent and only while it's ticked.
-declare -A PARENT=([boot]=gaming [kpin]=machine)
+declare -A PARENT=([boot]=gaming [kpin]=machine [hdmi]=machine [bios]=machine)
 # Never preselected on a first run: booting into the desktop is a choice,
 # gamescope is the default; HDMI-CEC is opt-in (it can wake the machine or
 # upset other devices on the TV, even on SteamOS), except on a Steam Machine,
-# which has CEC like on SteamOS.
-NO_PRESELECT=(boot cec)
+# which has CEC like on SteamOS. HDMI refresh boost needs someone at the
+# screen to confirm each step.
+NO_PRESELECT=(boot cec hdmi)
 
 declare -A LABEL=(
     [gaming]="SteamOS conversion: boot into gaming mode, Steam on the desktop"
@@ -27,6 +28,7 @@ declare -A LABEL=(
     [cec]="HDMI-CEC: use Steam with the TV remote, TV on/off with the PC (experimental)"
     [machine]="Steam Machine support: LED bar driver, hardware settings in Steam"
     [kpin]="Pin the kernel to $PINNED_KERNEL_VER (fixes rebooting after shutdown)"
+    [hdmi]="HDMI refresh boost: highest refresh your HDMI display runs"
     [bios]="Update BIOS"
 )
 declare -A CURRENT WANTED
@@ -34,6 +36,7 @@ declare -A CURRENT WANTED
 component_available() {
     case "$1" in
         machine|kpin) machine_available ;;
+        hdmi) hdmi_available ;;
         bios) bios_available ;;
     esac
 }
@@ -93,6 +96,12 @@ toggle_component() {
     # The kernel pin is opt-out: ticked along with Steam Machine support.
     if [[ "$c" == machine ]]; then WANTED[kpin]=${WANTED[machine]}; fi
     if [[ "$c" == kpin && "${WANTED[kpin]}" == 1 ]]; then WANTED[machine]=1; fi
+    # HDMI refresh boost and the BIOS update sit under Steam Machine support;
+    # the boost also needs the pinned kernel (newer kernels don't need it).
+    if [[ "$c" == machine && "${WANTED[machine]}" == 0 ]]; then WANTED[hdmi]=0; WANTED[bios]=0; fi
+    if [[ "$c" == kpin && "${WANTED[kpin]}" == 0 ]]; then WANTED[hdmi]=0; fi
+    if [[ "$c" == hdmi && "${WANTED[hdmi]}" == 1 ]]; then WANTED[machine]=1; WANTED[kpin]=1; fi
+    if [[ "$c" == bios && "${WANTED[bios]}" == 1 ]]; then WANTED[machine]=1; fi
 }
 
 show_menu() {
@@ -115,12 +124,13 @@ show_menu() {
             [[ "${CURRENT[gaming]}" == 1 ]] || now="-"
             want="gaming"; [[ "${WANTED[boot]}" == 1 ]] && want="desk"
             printf "  %-3s %-6s %-6s   └ %s\n" "$i" "$now" "$want" "$(boot_choice "${WANTED[boot]}")"
+        elif ! component_selectable "$c"; then
+            local tree=""; [[ -n "${PARENT[$c]:-}" ]] && tree="  └ "
+            printf "  %b%-3s %-6s %-6s %s%s (not available)%b\n" "$c_dim" "$i" "$now" "$want" "$tree" "${LABEL[$c]}" "$c_reset"
         elif [[ -n "${PARENT[$c]:-}" ]]; then
             printf "  %-3s %b %-6s   └ %s\n" "$i" "$now" "$want" "${LABEL[$c]}"
-        elif component_selectable "$c"; then
-            printf "  %-3s %b %-6s %s\n" "$i" "$now" "$want" "${LABEL[$c]}"
         else
-            printf "  %b%-3s %-6s %-6s %s (not available)%b\n" "$c_dim" "$i" "$now" "$want" "${LABEL[$c]}" "$c_reset"
+            printf "  %-3s %b %-6s %s\n" "$i" "$now" "$want" "${LABEL[$c]}"
         fi
     done
     echo
@@ -168,8 +178,9 @@ draw_menu_tui() {
         fi
         if ! component_selectable "$c"; then
             # Greyed out: nothing to do (e.g. BIOS already up to date).
-            local mark="   "; (( i == cursor )) && mark=" ${c_cyan}>${c_reset} "
-            echo -e "${mark}${c_dim}[ ] ${LABEL[$c]}  (not available)${c_reset}"
+            local mark="   " tree=""; (( i == cursor )) && mark=" ${c_cyan}>${c_reset} "
+            [[ -n "${PARENT[$c]:-}" ]] && tree="    └ "
+            echo -e "${mark}${c_dim}${tree}[ ] ${LABEL[$c]}  (not available)${c_reset}"
         elif (( i == cursor )); then
             # The green x's reset would end the bold too: re-enable it after.
             echo -e " ${c_cyan}>${c_reset} ${c_bold}${line//"$c_reset"/"$c_reset$c_bold"}${c_reset}${state}"

steamify.sh

@@ -15,11 +15,11 @@
 set -uo pipefail
 
 # Release version, see CHANGELOG.md.
-VERSION=1.1.4
+VERSION=1.2.0
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
-for lib in common state packages login-manager single-user steam-desktop steam-machine cec boot-session vapor-theme steamos-extras bios desktop-shortcut wizard-shortcut menu; do
+for lib in common state packages login-manager single-user steam-desktop steam-machine hdmi-refresh cec boot-session vapor-theme steamos-extras bios desktop-shortcut wizard-shortcut menu; do
     # shellcheck source=/dev/null
     source "$SCRIPT_DIR/lib/$lib.sh"
 done