Bug 209627

Summary: Touchscreen doesn't work anymore since commit 21653a4181ff292480599dad996a2b759ccf050f (regression)
Product: Drivers Reporter: rainer
Component: I2CAssignee: Drivers/I2C virtual user (drivers-i2c)
Status: RESOLVED CODE_FIX    
Severity: normal CC: jwrdegoede
Priority: P1    
Hardware: Intel   
OS: Linux   
URL: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.8.13&id=953fc770d069b167266d9d9ccfef0455fcfdc070
Kernel Version: 5.4.69/5.8.13 Subsystem:
Regression: Yes Bisected commit-id:

Description rainer 2020-10-12 14:02:35 UTC 
After upgrading from Linux 5.4.68 to Linux 5.4.69, the touchscreen of my Huawei Matebook 12 doesn't work anymore. The same issue happens with Linux >= 5.8.13.

I've compiled Linux from git to verify if it was fixed, but it doesn't help. But when reverting the commit 21653a4181ff292480599dad996a2b759ccf050f the touchscreen works fine again.

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.8.13&id=953fc770d069b167266d9d9ccfef0455fcfdc070



For reference my Arch Linux bug report:

https://bugs.archlinux.org/task/68178#comment193400

Hardware:
- CPU Intel Core m3-6Y30
- GPU Intel Graphics 515
Comment 1 Hans de Goede 2020-10-15 07:56:07 UTC 
Sorry about the regression. A patch fixing this has been posted upstream, see:

https://lore.kernel.org/linux-i2c/20201014144158.18036-1-hdegoede@redhat.com/
https://lore.kernel.org/linux-i2c/20201014144158.18036-2-hdegoede@redhat.com/

Closing.