Asus Zenbook UX5406AA Display Backlight Fix (#5620)

* Extract ASUS Expertbook B9406 display backlight fix and apply it for Zenbook ux5406aa too

* Add migration for Panther Lake Asus display bakclight fix

* Check if limine-update exists before executing it in the migration

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

bin/omarchy-hw-asus-zenbook-ux5406aa

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+# omarchy:summary=Detect ASUS Zenbook UX5406AA series laptops on Intel Panther Lake.
+
+omarchy-hw-match "ux5406aa" && omarchy-hw-intel-ptl

install/config/all.sh

@@ -51,6 +51,7 @@ run_logged $OMARCHY_INSTALL/config/hardware/intel/sof-firmware.sh
 
 run_logged $OMARCHY_INSTALL/config/hardware/dell/fix-xps-haptic-touchpad.sh
 
+run_logged $OMARCHY_INSTALL/config/hardware/asus/fix-asus-ptl-display-backlight.sh
 run_logged $OMARCHY_INSTALL/config/hardware/asus/fix-asus-ptl-b9406-display.sh
 run_logged $OMARCHY_INSTALL/config/hardware/asus/fix-asus-ptl-b9406-touchpad.sh
 run_logged $OMARCHY_INSTALL/config/hardware/asus/fix-audio-mixer.sh

install/config/hardware/asus/fix-asus-ptl-b9406-display.sh

@@ -1,21 +1,15 @@
-# Display fixes for ASUS ExpertBook B9406 (Panther Lake / Xe3 iGPU).
+# Display fix for ASUS ExpertBook B9406 (Panther Lake / Xe3 iGPU).
 #
 # Panel Replay is Xe3-new, default-on in the xe driver, and has a broken
 # exit/wake path on this eDP panel: the panel latches the last-presented
 # frame in self-refresh and never wakes for subsequent atomic commits, so
 # the screen only updates on a full modeset (e.g. a VT switch). The older
 # xe.enable_psr=0 knob does not cover Panel Replay.
-#
-# The panel's EDID on eDP-1 reads as empty, so xe takes backlight type from
-# VBT (which says PWM) but the panel actually wants DPCD AUX backlight.
-# Without xe.enable_dpcd_backlight=1, intel_backlight sysfs writes succeed
-# but produce no visible change; brightness is effectively binary.
 
 if omarchy-hw-asus-expertbook-b9406; then
   sudo mkdir -p /etc/limine-entry-tool.d
   cat <<EOF | sudo tee /etc/limine-entry-tool.d/asus-expertbook-b9406-display.conf >/dev/null
-# ASUS ExpertBook B9406 (Panther Lake / Xe3) display workarounds
+# ASUS ExpertBook B9406 (Panther Lake / Xe3) display workaround
 KERNEL_CMDLINE[default]+=" xe.enable_panel_replay=0"
-KERNEL_CMDLINE[default]+=" xe.enable_dpcd_backlight=1"
 EOF
 fi

install/config/hardware/asus/fix-asus-ptl-display-backlight.sh

@@ -0,0 +1,16 @@
+# Display backlight fix for ASUS Panther Lake / Xe3 iGPU laptops.
+# Enabled only for ExpertBook B9406 and Zenbook UX5406AA for now.
+# Other models need confirmation whether the issue exists there too.
+#
+# The panel's EDID on eDP-1 reads as empty, so xe takes backlight type from
+# VBT (which says PWM) but the panel actually wants DPCD AUX backlight.
+# Without xe.enable_dpcd_backlight=1, intel_backlight sysfs writes succeed
+# but produce no visible change; brightness is effectively binary.
+
+if omarchy-hw-asus-expertbook-b9406 || omarchy-hw-asus-zenbook-ux5406aa; then
+  sudo mkdir -p /etc/limine-entry-tool.d
+  cat <<EOF | sudo tee /etc/limine-entry-tool.d/asus-ptl-display-backlight.conf >/dev/null
+# ASUS Panther Lake display backlight fix
+KERNEL_CMDLINE[default]+=" xe.enable_dpcd_backlight=1"
+EOF
+fi

migrations/1777938402.sh

@@ -0,0 +1,15 @@
+echo "Fix display backlight on supported ASUS Panther Lake laptops"
+
+EXPERTBOOK_DROP_IN="/etc/limine-entry-tool.d/asus-expertbook-b9406-display.conf"
+
+if omarchy-hw-asus-expertbook-b9406 || omarchy-hw-asus-zenbook-ux5406aa; then
+  if [[ -f $EXPERTBOOK_DROP_IN ]]; then
+    sudo sed -i '/xe\.enable_dpcd_backlight/d' "$EXPERTBOOK_DROP_IN"
+  fi
+
+  source "$OMARCHY_PATH/install/config/hardware/asus/fix-asus-ptl-display-backlight.sh"
+
+  if omarchy-cmd-present limine-update; then
+    sudo limine-update
+  fi
+fi