Public bug reported:
As of upgrading to Ubuntu 20.04 (and with it Linux 5.4), adjusting
brightness no longer works. `/sys/class/backlight/intel_backlight/`
exists, but writing to `/sys/class/backlight/intel_backlight/brightness`
doesn't have any effect. If I boot into Linux 5.3 instead, changing
brightness works again. Complete dmesg output is attached, but I don't
see anything interesting in it.
My hardware is a Dell Inc. XPS 15 9575, with an Intel Core i7-8705G.
More info:
`lsb_release -rd`:
Description: Ubuntu Focal Fossa (development branch)
Release: 20.04
`apt-cache policy linux-generic`:
linux-generic:
Installed: 5.4.0.14.17
Candidate: 5.4.0.14.17
Version table:
*** 5.4.0.14.17 500
500 http://no.archive.ubuntu.com/ubuntu focal/main amd64 Packages
100 /var/lib/dpkg/status
** Affects: linux-5.4 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1865346
Title:
Changing backlight no longer works with Linux 5.4
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