diff --git a/AGENTS.md b/AGENTS.md
index 250e263..92d31a4 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -311,15 +311,16 @@ gamescope and the Plasma desktop. Primary target: the Valve Steam Machine
   `steamify.sh --boot gamescope|desktop` on its own (2.7.0, for scripts) only
   switches `boot` on an installed conversion: `WANTED` is `CURRENT` plus
   that, so no updates or removals a normal run would pick.
-- OS name for Steam (SteamOS conversion, 2.9.0): Steam's System settings
-  show `lsb_release -d`, so only `DISTRIB_DESCRIPTION` in `/etc/lsb-release`
-  becomes "CachyOS with Steamify" (a pacman hook, `zz-steamify-os-release`,
-  sets it again after cachyos-hooks resets it). In `/etc/os-release` only
-  `VARIANT`/`VARIANT_ID`/`VERSION_ID` (Steam's OS version, refreshed by
-  `os_version_refresh` after every run that changes something); never `NAME`
-  or `PRETTY_NAME`: limine-snapper-sync finds the boot entries by the OS name
-  ("Target OS name ... not found in /boot/limine.conf"). As a guard,
-  `/etc/default/limine` gets `TARGET_OS_NAME="CachyOS"` when it has none.
+- What Steam's System settings show (SteamOS conversion, 2.9.0): the OS name
+  stays CachyOS's everywhere (legal clarity; Steam reads `lsb_release -d`,
+  not touched). `/etc/os-release` gets only `VARIANT="Steamify <version>"`,
+  `VARIANT_ID`, `VERSION_ID` and `VERSION_CODENAME=steamos-X.Y` (Valve's
+  newest jupiter repo), refreshed by `os_version_refresh` after every run that
+  changes something; a pacman hook (`zz-steamify-os-release`) runs after
+  cachyos-hooks. Never `NAME` or `PRETTY_NAME`: limine-snapper-sync finds the
+  boot entries by the OS name ("Target OS name ... not found in
+  /boot/limine.conf"); `/etc/default/limine` gets `TARGET_OS_NAME="CachyOS"`
+  when it has none, as a guard.
 - `Relogin=true` means a gamescope that fails to start is relaunched in a
   tight loop; keep that in mind when changing session handling.
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b506b97..413c9f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,8 +8,9 @@ one per merged pull request.
 ## 2.9.0 - 2026-09-28
 
 - `d30d505` **chore: Version 2.9.0**
+- **feat: Steam's System settings: the OS name stays CachyOS (no renaming, also not in About this System), Steamify <version> as the variant, the SteamOS release it follows as the codename (steamos-3.9)**
 - `ce71b34` **feat: Steam's System settings and About this System like on SteamOS: OS name "CachyOS with Steamify" (lsb-release, kept through CachyOS updates by a pacman hook), Steamify as OS variant and version (os-release VARIANT/VERSION_ID; NAME/PRETTY_NAME stay CachyOS's for limine, TARGET_OS_NAME pinned), "CachyOS Linux with Steamify" in About this System; on a Steam Machine the serial number and Steam's Wi-Fi backend setting (existing installs get it as an update)**
-- **fix(ui): The progress screen's ✓ and ! stand upright: only a dot on the circle spins while a step runs (they kept the spinner's last angle)**
+- `07a94cd` **fix(ui): The progress screen's ✓ and ! stand upright: only a dot on the circle spins while a step runs (they kept the spinner's last angle)**
 
 ## 2.8.0 - 2026-09-28
 
diff --git a/lib/login-manager.sh b/lib/login-manager.sh
index 3a44e2a..510da38 100644
--- a/lib/login-manager.sh
+++ b/lib/login-manager.sh
@@ -18,22 +18,40 @@ gaming_status() {
     esac
 }
 
-# What Steam shows in its System settings: the OS name (`lsb_release -d`:
-# DISTRIB_DESCRIPTION in /etc/lsb-release) and Steamify as the OS variant and
-# version (os-release's VARIANT/VERSION_ID; its NAME and PRETTY_NAME stay
-# CachyOS's, which limine-snapper-sync finds the boot entries by).
-# cachyos-hooks resets lsb-release on updates, so our hook sets it again.
+# What Steam shows in its System settings besides the OS name (which stays
+# CachyOS's, for legal clarity and because limine-snapper-sync finds the boot
+# entries by it): Steamify as the variant and version, the SteamOS release it
+# follows as the codename (os-release VARIANT/VERSION_ID/VERSION_CODENAME).
 OS_NAME_SCRIPT=/usr/local/libexec/steamify-os-release
 OS_NAME_HOOK=/etc/pacman.d/hooks/zz-steamify-os-release.hook
 # limine's tools take the OS name from TARGET_OS_NAME, else os-release's
 # PRETTY_NAME: pinned to CachyOS, the boot entries never depend on os-release.
 LIMINE_DEFAULTS=/etc/default/limine
 
+steamos_codename() {
+    # The SteamOS release Steamify follows: Valve's newest jupiter-X.Y repo
+    # (where the SteamOS extras come from), as a codename (os-release allows
+    # no spaces or capitals: steamos-3.9). Offline (e.g. in the installer):
+    # the one set before, if any.
+    local v
+    v="$(curl -fsL --max-time 15 "$VALVE_MIRROR/" 2>/dev/null | grep -oE 'jupiter-[0-9]+\.[0-9]+/' | tr -d / | sort -V | tail -n 1)"
+    if [[ -n "$v" ]]; then echo "steamos-${v#jupiter-}"
+    else sed -n 's/^VERSION_CODENAME=//p' /etc/os-release 2>/dev/null; fi
+}
+
 os_name_enable() {
-    patch_file steamify-os-release.sh | fill VERSION="$VERSION" | sudo install -Dm755 /dev/stdin "$OS_NAME_SCRIPT" &&
+    # 2.9.0 pre-releases renamed the OS itself; the name stays CachyOS's.
+    if grep -q '^DISTRIB_DESCRIPTION=.*with Steamify' /etc/lsb-release 2>/dev/null &&
+        [[ -x /usr/share/libalpm/scripts/cachyos-branding ]]; then
+        sudo /usr/share/libalpm/scripts/cachyos-branding lsb-release
+    fi
+    [[ -n "$(kreadconfig6 --file kcm-about-distrorc --group General --key Name 2>/dev/null)" ]] &&
+        kset gaming kcm-about-distrorc General Name --delete
+    patch_file steamify-os-release.sh | fill VERSION="$VERSION" CODENAME="$(steamos_codename)" |
+        sudo install -Dm755 /dev/stdin "$OS_NAME_SCRIPT" &&
         patch_file steamify-os-release.hook | fill SCRIPT="$OS_NAME_SCRIPT" |
             sudo install -Dm644 /dev/stdin "$OS_NAME_HOOK" &&
-        sudo "$OS_NAME_SCRIPT" || { err "Setting the OS name for Steam failed."; return 1; }
+        sudo "$OS_NAME_SCRIPT" || { err "Setting Steamify's version for Steam failed."; return 1; }
     if [[ -f "$LIMINE_DEFAULTS" ]] && ! grep -q '^TARGET_OS_NAME=' "$LIMINE_DEFAULTS"; then
         backup_file "$LIMINE_DEFAULTS"
         printf '%s\n' 'TARGET_OS_NAME="CachyOS"' | sudo tee -a "$LIMINE_DEFAULTS" > /dev/null
@@ -44,10 +62,11 @@ os_name_enable() {
 
 os_name_disable() {
     sudo rm -f "$OS_NAME_HOOK" "$OS_NAME_SCRIPT"
-    [[ -f /etc/os-release ]] && sudo sed -i -e '/^VARIANT=/d' -e '/^VARIANT_ID=/d' -e '/^VERSION_ID=/d' /etc/os-release
+    [[ -f /etc/os-release ]] && sudo sed -i -e '/^VARIANT=/d' -e '/^VARIANT_ID=/d' -e '/^VERSION_ID=/d' -e '/^VERSION_CODENAME=/d' /etc/os-release
     # CachyOS's own values back, the way its hooks write them.
     if [[ -x /usr/share/libalpm/scripts/cachyos-branding ]]; then
         sudo /usr/share/libalpm/scripts/cachyos-branding os-release
+        # Undoes 2.9.0 pre-releases, which changed lsb-release's name too.
         sudo /usr/share/libalpm/scripts/cachyos-branding lsb-release
     fi
     if [[ -n "$(state_get gaming limine_target)" ]]; then
@@ -86,9 +105,6 @@ gaming_enable() {
     esac
     create_desktop_shortcut
     steam_enable
-    # System Settings' About this System: the name KInfoCenter shows instead
-    # of os-release's (package-owned, so not edited).
-    kset gaming kcm-about-distrorc General Name "CachyOS Linux with Steamify"
     os_name_enable || return 1
 }
 
diff --git a/patches/README.md b/patches/README.md
index 256f41c..a96e31d 100644
--- a/patches/README.md
+++ b/patches/README.md
@@ -13,5 +13,5 @@ read and reviewed on their own. `lib/*.sh` reads them with `patch_file
 | `steamify-fremont-poweroff.dkms.conf`, `steamify-cros-ec-cec.dkms.conf` | `lib/fremont-poweroff.sh`, `lib/cec.sh` | The DKMS modules' `dkms.conf` (`fill NAME=... VERSION=...`) |
 | `steam-shortcuts.py` | `lib/steam-game.sh` (Add as non-Steam game) | Reads and writes Steam's binary `shortcuts.vdf` (find, add or update, remove) |
 | `steamify-notifier.py` | `lib/update-notifier.sh` (Update notifications) | The daily check: notification and tray icon when there's a new release |
-| `steamify-os-release.sh`, `steamify-os-release.hook` | `lib/login-manager.sh` (SteamOS conversion) | Sets the OS name Steam shows ("CachyOS with Steamify": `DISTRIB_DESCRIPTION` in `/etc/lsb-release`, which `lsb_release -d` gives Steam; never `/etc/os-release`, whose `PRETTY_NAME` limine-snapper-sync needs); the pacman hook runs it again after cachyos-hooks resets it (`fill SCRIPT=...`) |
+| `steamify-os-release.sh`, `steamify-os-release.hook` | `lib/login-manager.sh` (SteamOS conversion) | Steamify as the OS variant and version, and the SteamOS release it follows as the codename, for Steam's System settings (`VARIANT`, `VERSION_ID`, `VERSION_CODENAME` in `/etc/os-release`; the OS name stays CachyOS's); the pacman hook runs it again after cachyos-hooks (`fill SCRIPT=... VERSION=... CODENAME=...`) |
 | `cros-ec-cec-single-port.patch` | `lib/cec.sh` (HDMI-CEC) | Makes Valve's Steam Machine CEC driver find amdgpu's HDMI port |
diff --git a/patches/steamify-os-release.hook b/patches/steamify-os-release.hook
index c4ce503..3aba938 100644
--- a/patches/steamify-os-release.hook
+++ b/patches/steamify-os-release.hook
@@ -1,15 +1,14 @@
 # Installed by Steamify CachyOS (SteamOS conversion): runs after
-# cachyos-hooks' lsb-release/cachyos-branding hooks (hooks run in file name
+# cachyos-hooks' os-release/cachyos-branding hooks (hooks run in file name
 # order).
 [Trigger]
 Operation = Install
 Operation = Upgrade
 Type = Package
 Target = filesystem
-Target = lsb-release
 Target = cachyos-hooks
 
 [Action]
-Description = Steamify: the OS name Steam shows (CachyOS with Steamify)
+Description = Steamify: the OS variant and version Steam shows
 When = PostTransaction
 Exec = @SCRIPT@
diff --git a/patches/steamify-os-release.sh b/patches/steamify-os-release.sh
index 07d4def..5a35ad4 100644
--- a/patches/steamify-os-release.sh
+++ b/patches/steamify-os-release.sh
@@ -1,11 +1,11 @@
 #!/bin/sh
 # Installed by Steamify CachyOS (SteamOS conversion): what Steam shows in its
-# System settings. The OS name is `lsb_release -d` (DISTRIB_DESCRIPTION in
-# /etc/lsb-release); the version comes from /etc/os-release's VARIANT and
-# VERSION_ID. CachyOS's hooks reset lsb-release on updates of lsb-release and
-# cachyos-hooks; the zz-steamify-os-release hook runs this after them.
-# os-release's NAME and PRETTY_NAME stay CachyOS's: limine-snapper-sync finds
-# the boot entries by the OS name.
-sed -i 's|^DISTRIB_DESCRIPTION=.*$|DISTRIB_DESCRIPTION="CachyOS with Steamify"|' /etc/lsb-release
-sed -i -e '/^VARIANT=/d' -e '/^VARIANT_ID=/d' -e '/^VERSION_ID=/d' /etc/os-release
-printf '%s\n' 'VARIANT="Steamify"' 'VARIANT_ID=steamify' 'VERSION_ID=@VERSION@' >> /etc/os-release
+# System settings besides the OS name, which stays CachyOS's: Steamify as the
+# variant and version, and the SteamOS release it follows as the codename
+# (/etc/os-release's VARIANT, VERSION_ID, VERSION_CODENAME). NAME and
+# PRETTY_NAME are never touched: limine-snapper-sync finds the boot entries by
+# the OS name. The zz-steamify-os-release hook runs this after cachyos-hooks.
+sed -i -e '/^VARIANT=/d' -e '/^VARIANT_ID=/d' -e '/^VERSION_ID=/d' -e '/^VERSION_CODENAME=/d' /etc/os-release
+printf '%s\n' 'VARIANT="Steamify @VERSION@"' 'VARIANT_ID=steamify' 'VERSION_ID=@VERSION@' >> /etc/os-release
+[ -n "@CODENAME@" ] && echo 'VERSION_CODENAME=@CODENAME@' >> /etc/os-release
+exit 0