kernel-bug-exists-upstream-3.18-rc3 -- the aforementioned
/usr/share/X11/xorg.conf.d/80-backlight.conf
with the contents:
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "sna"
Option "Backlight" "intel_backlight" # use your backlight that works here
BusID "PCI:0:2:0"
EndSection
continues to work to workaround it.
** Tags added: kernel-bug-exists-upstream-3.18-rc3
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https://bugs.launchpad.net/bugs/1388636
Title:
[Lenovo V570 Notebook] Brightness not changing via UI widget in GNOME
shell or hotkeys
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