Add ASUS ExpertBook B9406 display and touchpad fixes for Panther Lake

Author: mijuny

bin/omarchy-hw-asus-expertbook-b9406

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+# Detect ASUS ExpertBook B9406 series laptops on Intel Panther Lake.
+
+omarchy-hw-match "B9406" && omarchy-hw-intel-ptl

install/config/all.sh

@@ -47,6 +47,8 @@ run_logged $OMARCHY_INSTALL/config/hardware/intel/fix-wifi7-eht.sh
 
 run_logged $OMARCHY_INSTALL/config/hardware/dell/fix-xps-haptic-touchpad.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
 run_logged $OMARCHY_INSTALL/config/hardware/asus/fix-mic.sh
 

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

@@ -0,0 +1,21 @@
+# Display fixes 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
+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-b9406-touchpad.sh

@@ -0,0 +1,23 @@
+# Touchpad quirks for ASUS ExpertBook B9406 (Pixart 093A:4F05 on i2c-hid).
+#
+# The kernel produces perfect Precision Touchpad reports but libinput's
+# jump-detection heuristic discards every motion event as "kernel bug:
+# Touch jump detected and discarded" because the pad reports pressure
+# values of 0-1, confusing the contact stability check. Button events
+# still pass, so clicks register but motion does not.
+#
+# Mask the pressure axes with a quirks override, same pattern as the
+# Asus UX302LA entry in libinput's shipped 50-system-asus.quirks.
+
+if omarchy-hw-asus-expertbook-b9406; then
+  sudo mkdir -p /etc/libinput
+  sudo tee /etc/libinput/asus-expertbook-b9406.quirks >/dev/null <<EOF
+[ASUS ExpertBook B9406 Touchpad]
+MatchBus=i2c
+MatchUdevType=touchpad
+MatchVendor=0x093A
+MatchProduct=0x4F05
+MatchDMIModalias=dmi:*svnASUS*:pn*B9406*
+AttrEventCode=-ABS_MT_PRESSURE;-ABS_PRESSURE;
+EOF
+fi

migrations/1777040047.sh

@@ -0,0 +1,22 @@
+echo "Apply display and touchpad fixes for ASUS ExpertBook B9406 (Panther Lake)"
+
+source "$OMARCHY_PATH/install/config/hardware/asus/fix-asus-ptl-b9406-display.sh"
+source "$OMARCHY_PATH/install/config/hardware/asus/fix-asus-ptl-b9406-touchpad.sh"
+
+if omarchy-hw-asus-expertbook-b9406; then
+  DROP_IN="/etc/limine-entry-tool.d/asus-expertbook-b9406-display.conf"
+  DEFAULT_LIMINE="/etc/default/limine"
+
+  # Keep /etc/default/limine in sync with the drop-in. Install-time this is
+  # handled by install/login/limine-snapper.sh; migrations have to do it
+  # themselves. Idempotent: skip if the drop-in's header comment is already
+  # present (a unique-to-this-drop-in marker, so it doesn't collide with
+  # manual cmdline tweaks a user may have made).
+  HEADER='# ASUS ExpertBook B9406 (Panther Lake / Xe3) display workarounds'
+  if [[ -f $DROP_IN && -f $DEFAULT_LIMINE ]] && \
+       ! grep -Fxq "$HEADER" "$DEFAULT_LIMINE"; then
+    sudo tee -a "$DEFAULT_LIMINE" >/dev/null < "$DROP_IN"
+  fi
+
+  sudo limine-update
+fi