Sorry, my previous comment #10 was incorrect. What worked again after
the reinstall was just the notification bubble, but it did not actually
change the brightness. I had to add the EnableBrightnessControl option
again, to the new xorg.conf that was created during installation. After
an X restart I now have the bubble and it actually works:
Section "Device"
Identifier "Default Device"
Option "NoLogo" "True"
Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection
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https://bugs.launchpad.net/bugs/726692
Title:
Screen backlight adjustment stopped working on MacBook Pro 5,4 and
other hardware
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