Okay, my upstream kernel test was a little naive.
When I was bisecting the problem, I noticed that my test to control the
brightness failed even with kernels that worked before.
So I noticed that I still had a /usr/share/X11/xorg.conf.d/80-intel.conf file
with:
Section "Device"
Identifier "card0"
Driver "intel"
Option "AccelMethod" "sna"
Option "Backlight" "intel_backlight" # use your backlight that
works here
BusID "PCI:0:2:0"
EndSection
After *removing* that file, it worked for me in the old kernel versions,
so I tried the upstream kernel again and it works. So it's fixed in an
upstream kernel, which is fine for me, as it seems to be pretty stable.
** Tags removed: kernel-bug-exists-upstream kernel-bug-exists-upstream-4.1-rc3
** Tags added: kernel-bug-fixed-upstream kernel-bug-fixed-upstream-4.1-rc3
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https://bugs.launchpad.net/bugs/1454207
Title:
Samsung 730U3E LCD backlight brightness control doesn't work
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