** Tags added: focal
** Also affects: libevdev (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1906341
Title:
Touchpad button doesn't work on Dell Precision 7550/7750
Status in libevdev package in Ubuntu:
New
Status in libinput package in Ubuntu:
New
Status in linux package in Ubuntu:
New
Bug description:
[Impact]
* The touchpad's right button become no function after update to 5.4
kernel
* The INPUT_PROP_BUTTONPAD property is set by 5.4 kernel, so that
libinput regard it as clickpad.
* Add a model quirk to unset the bit can make touchpad's right button
works normally.
[Test Case]
* 1. Boot into Ubuntu
2. Identify touchpad input device number,
can be obtained in $HOME/.local/share/xorg/Xorg.0.log
3. $ udevadm info /sys/class/input/inputX
check PROP environment variable,
it is 5 if INPUT_PROP_BUTTONPAD property is set
4. And the touchpad right button become no function
5. After update the libevdev with disable_property
API and libinput10 with model quirk
6. reboot
7. The input device PROP is still 5,
but touchpad right button is workable
[Where problems could occur]
* For libevdev2 package, backport the upstream commit:
https://gitlab.freedesktop.org/libevdev/libevdev/-/commit/4226c7801b4ea1b0c7d1eaac47ca24ece8f24809
The API is not originally exist in the system,
so it will only be utilized by our model quirk.
* For libinput, add model quirk for the platform to disable
INPUT_PROP_BUTTONPAD bit.
Only disable the INPUT_PROP_BUTTONPAD for specified model,
and it doesn't issue any
IO command to kernel, so the behavior should be the same
as previous kernel when INPUT_PROP_BUTTONPAD is not set.
[Other Info]
* A public bug is reported
https://www.dell.com/community/Linux-Developer-Systems/Touchpad-right-click-button-not-working-with-Ubuntu-20-04-on/td-p/7636831
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