Notes X1 Carbon 6th gen / 2018 (20KH) and Linux

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Problem: xbacklight does not work, can't set brightness

Driver does not support xbacklight API, but brightness can be set via sysfs.

Solution: Use cbacklight (needs root).

Screen Flickering

I have experienced some screen flickering issues with Firefox, they disappeared when I disabled PSR (kernel parameter i915.enable_psr=0).

Related bug report

Info collected by Hanno Böck