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I've got a HP Envy x360 laptop upon an initial boot the touch screen works. but after suspending the touchscreen no longer functions. Doing some research I believe the module responsible for this is hid_multitouch. Reloading the module via rmmod hid_multitouch && modprobe hid_multitouch (as superuser of course) doesn't seem to affect the problem.

lspci: http://pastebin.com/AGkiSp5L lsusb: http://pastebin.com/RNnahs11

I can't seem to even find the device via lsusb or lspci what other ways would I be able to identify the device? Is there a secondary module that would need to be reloaded simultaneously?

Sion
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1 Answers1

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If running sudo rmmod hid_multitouch after a reboot disables your touchscreen try this: 

su -c "echo "SUSPEND_MODULES="hid_multitouch"" >> /etc/pm/config.d/modules"

This will unload that module prior to suspend, hopefully fixing your problem.

If that's not the case, run xinput --list while the touchscreen is working and when the touchscreen is not working, compare the output, if something is missing when you resume from a suspend, you'll have to re.

Example output:

⎡ Virtual core pointer                      id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ ITE Tech. Inc. ITE Device(8595)           id=11   [slave  pointer  (2)]
⎜   ↳ ITE Tech. Inc. ITE Device(8595) Touchpad  id=12   [slave  pointer  (2)]
⎜   ↳ SYNA7508:00 06CB:77B2                     id=14   [slave  pointer  (2)]

My touchscreen device is SYNA7508:00 06CB:77B2 id=14

Try running xinput set-prop DEVICE_ID "Device Enabled" 0 && xinput set-prop DEVICE_ID "Device Enabled" 1 replacing the ID with your device ID post suspend.

If that command fixes it, try replacing it with the rmmod&&modprobe found here (dont forget to chmod u+x the file making it executable): https://bugs.launchpad.net/ubuntu/+source/xinput/+bug/1275416/comments/28 However, if the device does not show up after suspend, you'll have to reattach it, here's another example: https://bugs.launchpad.net/ubuntu/+source/xinput/+bug/1275416/comments/19

post irony
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