Bug 414964

Summary:	Touchpad stopped working after kernel update to 4.15.0-72
Product:	[KDE Neon] neon	Reporter:	tomas.teijeiro
Component:	general	Assignee:	Neon Bugs <neon-bugs-null>
Status:	RESOLVED DOWNSTREAM
Severity:	grave	CC:	jr, neon-bugs-null, sitter
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description tomas.teijeiro 2019-12-08 19:02:02 UTC

SUMMARY

After updating my neon installation to plasma 5.17.4 with kernel 4.15.0-72, the touchpad stopped working completely. The synaptics touchpad is still recognized as an input device in `xinput`, but it does not send any X event. If I boot with the previous kernel, 4.15.0-70, the boot screen shows neon 5.17.3, and everything works perfectly. I'm not sure if it is a kernel bug, an Ubuntu bug, or a Neon bug.

My laptop is a Dell XPS 13 9333.

STEPS TO REPRODUCE
1. Boot KDE Neon
2. 
3. 

OBSERVED RESULT

The touchpad does not work at all. No motion, no click, no scrolling.


EXPECTED RESULT

The touchpad should work as always.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.17.4
KDE Frameworks Version: 5.64
Qt Version: 5.13.2

ADDITIONAL INFORMATION

Behavior observed in a Dell XPS 13 9333 machine.

Comment 1 tomas.teijeiro 2019-12-17 18:34:13 UTC

Apparently the bug affects any ubuntu 18.04 installation, so it's not directly related to neon or KDE: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1854895

Comment 2 Christoph Feck 2019-12-18 21:36:22 UTC

Thanks for the update. Users there confirmed it is a kernel regression; changing status.