521464 2026-06-14 12:47:18 +0000 Udev rules for LIBINPUT_CALIBRATION_MATRIX do not work on wayland 2026-07-20 19:11:44 +0000 1 1 4 Plasma kwin libinput 6.6.5 Other Linux RESOLVED FIXED https://bugs.kde.org/show_bug.cgi?id=519392 wayland-only NOR normal --- 1 Liarus1001 kwin-bugs-null nate nicolas.fella https://invent.kde.org/plasma/kwin/-/commit/11762f5aa28ed5bcd53faec3021fefb8c49b7e36 6.6.6 0 oldest_to_newest 2522965 0 Liarus1001 2026-06-14 12:47:18 +0000 DESCRIPTION Udev rules for LIBINPUT_CALIBRATION_MATRIX do not work on wayland, they work on the plasma's x11 session. I have a device that has a touchscreen that is rotated by 180°, i use this udev rule to fix it: ENV{LIBINPUT_CALIBRATION_MATRIX}="-1 0 1 0 -1 1" That rule works fine on x11 but doesn't work on wayland. STEPS TO REPRODUCE 1. Apply the udev rule 2. reboot the computer 3. login again OBSERVED RESULT Touchscreen input is not working EXPECTED RESULT Touchscreen input should be rotated by 180° SOFTWARE/OS VERSIONS Operating System: CachyOS Linux KDE Plasma Version: 6.6.5 KDE Frameworks Version: 6.27.0 Qt Version: 6.11.1 Kernel Version: 7.0.11-1-cachyos (64-bit) Graphics Platform: offscreen Processors: 4 × Intel® Celeron® N5095 @ 2.00GHz Memory: 16 GiB of RAM (15.4 GiB usable) ADDITIONAL INFORMATION The behavior can be replicated on other Wayland environments, it also works fine on other x11 desktop environments. 2523420 1 nicolas.fella 2026-06-16 09:34:09 +0000 Please paste the output of "sudo libinput list-devices" 2523578 2 Liarus1001 2026-06-16 18:47:10 +0000 (In reply to Nicolas Fella from comment #1) > Please paste the output of "sudo libinput list-devices" Hello, here is the output, with the udev rule shown before: ❯ cat /etc/udev/rules.d/99-gole2pro-touch.rules ENV{LIBINPUT_CALIBRATION_MATRIX}="-1 0 1 0 -1 1" ~ liarus@LIARUS-MN ❯ sudo libinput list-devices [sudo] password for liarus: Device: Goodix Capacitive TouchScreen Kernel: /dev/input/event8 Id: i2c:0416:038f Group: 1 Seat: seat0, default Capabilities: keyboard touch Tap-to-click: n/a Tap-and-drag: n/a Tap button map: n/a Tap drag lock: n/a Left-handed: n/a Nat.scrolling: n/a Middle emulation: n/a Calibration: -1.00 0.00 1.00 0.00 -1.00 1.00 Scroll methods: none Scroll button: n/a Scroll button lock: n/a Click methods: none Clickfinger button map: n/a Disable-w-typing: n/a Disable-w-trackpointing: n/a Accel profiles: n/a Rotation: 0.0 Area rectangle: n/a ________ If i remove the rule and reboot it goes back to "Calibration: identity matrix" i assume that's what you want to look at ? 2525643 3 Liarus1001 2026-06-22 14:37:25 +0000 FYI, i tried to report the bug to libinput but they said it is a compositor bug: https://gitlab.freedesktop.org/libinput/libinput/-/work_items/1303 2528325 4 nicolas.fella 2026-06-30 11:05:57 +0000 > i assume that's what you want to look at ? yes, thanks. It shows that libinput picks up the value from udev. KWin doesn't seem to process it correctly 2528351 5 bug-janitor 2026-06-30 12:21:54 +0000 A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/9503 2529538 6 vlad.zahorodnii 2026-07-06 09:28:25 +0000 Git commit 43d0850ddb704c7b1bc8113dba645d955e8a318f by Vlad Zahorodnii, on behalf of Nicolas Fella. Committed on 06/07/2026 at 09:28. Pushed by vladz into branch 'master'. libinput: Fix Device::serializeMatrix QMatrix4x4's ctor accepts data in row-major order, but constData() returns column-major order This means that serialize and deserialize are inconsistent Fix serialize to also work on row-major order M +12 -0 autotests/libinput/device_test.cpp M +8 -4 src/backends/libinput/device.cpp https://invent.kde.org/plasma/kwin/-/commit/43d0850ddb704c7b1bc8113dba645d955e8a318f 2529546 7 vlad.zahorodnii 2026-07-06 10:23:51 +0000 Git commit 88f88971326600923329c3542ade808c35d0b703 by Vlad Zahorodnii. Committed on 06/07/2026 at 10:23. Pushed by vladz into branch 'Plasma/6.7'. libinput: Fix Device::serializeMatrix QMatrix4x4's ctor accepts data in row-major order, but constData() returns column-major order This means that serialize and deserialize are inconsistent Fix serialize to also work on row-major order (cherry picked from commit 43d0850ddb704c7b1bc8113dba645d955e8a318f) Co-authored-by: Nicolas Fella <nicolas.fella@gmx.de> M +12 -0 autotests/libinput/device_test.cpp M +8 -4 src/backends/libinput/device.cpp https://invent.kde.org/plasma/kwin/-/commit/88f88971326600923329c3542ade808c35d0b703 2529550 8 vlad.zahorodnii 2026-07-06 10:35:40 +0000 Git commit 11762f5aa28ed5bcd53faec3021fefb8c49b7e36 by Vlad Zahorodnii. Committed on 06/07/2026 at 10:35. Pushed by vladz into branch 'Plasma/6.6'. libinput: Fix Device::serializeMatrix QMatrix4x4's ctor accepts data in row-major order, but constData() returns column-major order This means that serialize and deserialize are inconsistent Fix serialize to also work on row-major order (cherry picked from commit 43d0850ddb704c7b1bc8113dba645d955e8a318f) Co-authored-by: Nicolas Fella <nicolas.fella@gmx.de> M +12 -0 autotests/libinput/device_test.cpp M +8 -4 src/backends/libinput/device.cpp https://invent.kde.org/plasma/kwin/-/commit/11762f5aa28ed5bcd53faec3021fefb8c49b7e36