[Wayland-bugs] [Bug 99079] kernel: Improve Surface Pro Type Cover 2 support

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99079

--- Comment #7 from defree at gmail.com ---
First, about the touchscreen problem, I confirm it is related to handling of
events higher in the stack (works fine with a clean gnome-shell 3.22, fails
under some circumstances with other GTK apps or Chrome...). Solved as far as
input system is concerned :).

I tested with 4.10-rc2 (not manually built but taken from Manjaro's unstable
repository). Behavior is quite chaotic. I will try to summarize:
- regression on suspend/resume (4.9 release has the best/correct behavior)
- USB initialization is indeed different, but unreliable.

Cursor behavior is changed:
1) Tap-to-click no longer works (but according to our discussion, it used to be
hardware emulation).
2) Movement is still relative but in a weird way. As if coordinates delta were
interpreted in a wrong system (the closest I felt was with a wacom mouse which
movement was interpreted relative to the tablet and not to the orientation of
the mouse itself).
3) Yet libinput-list-devices and xinput list-props reports are the same.

Furthermore, on kernel side device initialization works rarely:
- I have to plug/unplug many times or reboot the device to get it initialized.
- after being initialized with 4.10 kernel, the changes in behavior survive a
reboot and change to kernel 4.9. I have to unplug the usb or power off the
system to get back to the clean behavior.

This "reboot survival" surprised me the most but I was able to reproduce
multiple times.

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