We found out that the touchscreen is disabled by libinput after suspend/resume:
Check the following properties (the touchscreen is id=10 for our DUT, see
`xinput list`)
before suspend:
$ xinput list-props 10
Device 'CUST0000:00 0EEF:C003':
[...snip...]
libinput Send Events Mode Enabled (328): 0, 0
after suspend:
$ xinput list-props 10
Device 'CUST0000:00 0EEF:C003':
[...snip...]
libinput Send Events Mode Enabled (328): 1, 0
According to libinput documentation
https://wayland.freedesktop.org/libinput/doc/latest/configuration.html,
Send Events Mode is used to turn on/off the device input in libinput.
The touchscreen function can be re-enabled after suspend, by entering the
following command:
xinput set-prop 10 328 0 0
We are still unknown why the device is turned off after suspend.
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https://bugs.launchpad.net/bugs/2087831
Title:
touchscreen has no response after resume from suspend in Xorg session
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