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feat(deploy): add eGalax touchscreen support for Dell 9030 AIO

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The Dell OptiPlex 9030 AIO's built-in eGalax touchscreen is
misidentified by libinput as a touchpad. Fix:

1. Unbind from usbhid at boot via udev, bind to usbtouchscreen
   kernel module which handles it as absolute input
2. Apply calibration matrix via systemd service after X11 starts
   (swap+invert axes, scale to active panel area 238-1853 x 197-1869)

Also updates hardware comments for Dell 9030 (was HP ProDesk).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Patrick Mulligan 2026-03-29 22:03:15 -04:00
commit 7afcc6fc5d
1 changed files with 26 additions and 4 deletions
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30
deploy/nixos/hardware/batm3.nix
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@ -1,6 +1,6 @@
# BATM3 Hardware Configuration
# HP ProDesk 600 G3 DM, Intel i5-7500T, Intel HD 630
# Temporary board replacement for GeneralBytes BATM3 (ARM Android → x86 NixOS)
# Dell OptiPlex 9030 AIO, Intel i7-4790S, Intel HD 4600
# Board replacement for GeneralBytes BATM3 (ARM Android → x86 NixOS)
{ config, lib, pkgs, ... }:
@ -21,6 +21,7 @@
kernelModules = [
"kvm-intel"
"usbtouchscreen"
];
kernelParams = [
@ -67,8 +68,11 @@
hybrid-sleep.enable = false;
};
# Serial port access for bill validator/dispenser (USB-serial adapters)
# Stable symlinks by adapter serial number (prevents ttyUSB reordering on reboot)
# eGalax touchscreen (Dell 9030 AIO built-in panel)
# The eGalax HID descriptor confuses libinput (treats it as touchpad).
# Fix: unbind from usbhid at boot, bind to usbtouchscreen kernel module,
# then apply calibration matrix after X11 starts.
# Unbind eGalax from usbhid, bind to usbtouchscreen
services.udev.extraRules = lib.mkAfter ''
KERNEL=="ttyS[0-9]*", MODE="0666"
KERNEL=="ttyUSB[0-9]*", MODE="0666"
@ -76,5 +80,23 @@
SUBSYSTEM=="tty", ATTRS{serial}=="DDDLb103Y23", SYMLINK+="ttyF56", MODE="0666"
SUBSYSTEM=="tty", ATTRS{serial}=="A9YW78OC", SYMLINK+="ttyMEI", MODE="0666"
SUBSYSTEM=="tty", ATTRS{serial}=="A9ZF8ELY", SYMLINK+="ttyNFC", MODE="0666"
ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="0eef", ATTRS{idProduct}=="0001", RUN+="${pkgs.bash}/bin/bash -c 'echo $kernel:1.0 > /sys/bus/usb/drivers/usbhid/unbind 2>/dev/null; echo 0eef 0001 > /sys/bus/usb/drivers/usbtouchscreen/new_id 2>/dev/null'"
'';
# Apply touchscreen calibration after X11 starts
# Matrix: swap X/Y axes, invert both, scale to active panel area (238-1853 x 197-1869)
systemd.services.egalax-calibrate = {
description = "Calibrate eGalax touchscreen";
after = [ "display-manager.service" ];
requires = [ "display-manager.service" ];
wantedBy = [ "graphical.target" ];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
User = "lamassu";
Environment = "DISPLAY=:0";
ExecStartPre = "${pkgs.coreutils}/bin/sleep 3";
ExecStart = "${pkgs.xorg.xinput}/bin/xinput set-prop 'eGalax Inc. USB TouchController' 'Coordinate Transformation Matrix' 0 -1.268 1.147 -1.224 0 1.118 0 0 1";
};
};
}