Your issue might be a Pipe A problem.
The fix for this issue is to quirk your card to force enabling Pipe A. Please
regenerate your xorg.conf with the command >>sudo dpkg-reconfigure
xserver-xorg<< by confirming every question with enter. Afterwards try setting
the option >>Option "ForceEnablePipeA" "true"<< in your xorg.conf device
section:
Section "Device"
...
Option "ForceEnablePipeA" "true"
EndSection
After a X restart the problem should be gone if it was a Pipe A problem.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Incomplete
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laptop backlight is turning off
https://bugs.launchpad.net/bugs/247315
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