fix: Show the HDMI-CEC settings in Steam

CachyOS's gaming mode script sets STEAM_ENABLE_CEC=0. A drop-in for
steam-launcher.service overrides it with a later EnvironmentFile=.

CHANGELOG.md

@@ -12,6 +12,11 @@ one per merged pull request.
     steamos-manager; so steamos-manager's `configure-cecd` unit couldn't be
     enabled and cecd ran without Steam's settings. Steam Machine support now
     links them once steamos-manager is there.
+- **fix: HDMI-CEC settings shown in Steam**
+  - CachyOS's gaming mode script sets `STEAM_ENABLE_CEC=0`, which hides
+    Steam's HDMI-CEC settings (and its CEC volume buttons). HDMI-CEC now adds
+    a drop-in for `steam-launcher.service` that overrides it with
+    `STEAM_ENABLE_CEC=1` (`/etc/steamify/steam-cec.env`).
 
 ## 1.1.1 - 2026-09-25
 

TECHNICAL.md

@@ -192,6 +192,13 @@ devices found. Also turn on CEC on the TV
 `steamos-manager` writes cecd's settings from Steam's (wake the TV, put it to
 sleep), in `~/.config/cecd/config.d/`, and Steam shows its HDMI-CEC
 settings; the wizard restarts steamos-manager so that happens right away.
+CachyOS's gaming mode script (`/usr/lib/steamos/gamescope-session`) sets
+`STEAM_ENABLE_CEC=0`, which hides those settings; Steam reads the script's
+variables from `$XDG_RUNTIME_DIR/gamescope-environment`. HDMI-CEC adds a
+drop-in for `steam-launcher.service`
+(`/etc/systemd/user/steam-launcher.service.d/10-steamify-cec.conf`) with a
+second `EnvironmentFile=` (`/etc/steamify/steam-cec.env`,
+`STEAM_ENABLE_CEC=1`), which overrides it from the next gaming mode start.
 
 It's experimental: on SteamOS itself CEC can wake the Steam Machine right
 after it goes to sleep (Samsung TVs,

lib/cec.sh

@@ -11,6 +11,11 @@ CEC_PKGS=(cecd cec-audio-control inputattach-cec-units)
 # steamos-manager checks once, at its start, whether cecd runs; order it
 # after cecd so it never misses it at login.
 CEC_ORDER_DROPIN=/etc/systemd/user/steamos-manager.service.d/10-steamify-after-cecd.conf
+# CachyOS's gaming mode script exports STEAM_ENABLE_CEC=0, which hides
+# Steam's HDMI-CEC settings; Steam reads it from the gamescope environment
+# file. A later EnvironmentFile= overrides it.
+CEC_STEAM_ENV=/etc/steamify/steam-cec.env
+CEC_STEAM_DROPIN=/etc/systemd/user/steam-launcher.service.d/10-steamify-cec.conf
 
 cec_link_steamos_manager() {
     # On a Steam Machine: steamos-manager writes cecd's config from Steam's
@@ -77,11 +82,17 @@ cec_enable() {
     sudo mkdir -p "$(dirname "$CEC_ORDER_DROPIN")"
     printf '%s\n' "# Written by Steamify: steamos-manager only sees cecd if it runs at its start." \
         '[Unit]' 'After=cecd.service' | sudo tee "$CEC_ORDER_DROPIN" >/dev/null
+    sudo mkdir -p "$(dirname "$CEC_STEAM_ENV")" "$(dirname "$CEC_STEAM_DROPIN")"
+    printf '%s\n' "# Written by Steamify: Steam's HDMI-CEC settings in gaming mode." 'STEAM_ENABLE_CEC=1' |
+        sudo tee "$CEC_STEAM_ENV" >/dev/null
+    printf '%s\n' "# Written by Steamify: overrides STEAM_ENABLE_CEC=0 from the gaming mode script." \
+        '[Service]' "EnvironmentFile=-$CEC_STEAM_ENV" | sudo tee "$CEC_STEAM_DROPIN" >/dev/null
     systemctl --user daemon-reload
     cec_link_steamos_manager
     if compgen -G "/dev/cec*" >/dev/null; then
         systemctl --user restart cecd.service 2>/dev/null
-        ok "HDMI-CEC on ($(cd /dev && echo cec*)). Turn on CEC on your TV too (e.g. Sony: BRAVIA Sync, Samsung: Anynet+, LG: SimpLink)."
+        ok "HDMI-CEC on ($(cd /dev && echo cec*)); Steam shows its settings from the next gaming mode start."
+        info "Turn on CEC on your TV too (e.g. Sony: BRAVIA Sync, Samsung: Anynet+, LG: SimpLink)."
     else
         warn "No CEC device (/dev/cec*) found: your GPU may not support CEC. A USB CEC adapter"
         warn "(e.g. Pulse-Eight) works too. Check again after a restart with: ls /dev/cec*"
@@ -93,8 +104,8 @@ cec_disable() {
     systemctl --user disable --now cecd.service cec-audio-control.socket cec-audio-control.service 2>/dev/null
     systemctl --user disable steamos-manager-configure-cecd.service 2>/dev/null
     sudo pacman -Rns --noconfirm "${CEC_PKGS[@]}" 2>/dev/null
-    sudo rm -f "$CEC_ORDER_DROPIN"
+    sudo rm -f "$CEC_ORDER_DROPIN" "$CEC_STEAM_DROPIN" "$CEC_STEAM_ENV"
-    sudo rmdir "$(dirname "$CEC_ORDER_DROPIN")" 2>/dev/null
+    sudo rmdir "$(dirname "$CEC_ORDER_DROPIN")" "$(dirname "$CEC_STEAM_DROPIN")" "$(dirname "$CEC_STEAM_ENV")" 2>/dev/null
     systemctl --user daemon-reload
     if [[ -n "$(state_get cec installed_linuxconsole)" ]]; then
         sudo pacman -Rns --noconfirm linuxconsole 2>/dev/null