Please open a terminal and run 'ls /sys/class/backlight' and let me know
what directories are listed.
Then go into each of the directories in turn. Each will have a file
named "brightness" which will tell you the current brightness and
another named "max_brightness" which will tell you the maximum supported
brightness. Run the following commands to read the values:
cd /sys/class/backlight/...
cat brightness
cat max_brightness
Now pick a new brightness value between 0 and max_brightness but
significantly different from the current brightness (be careful of going
too low though; the macbook backlights will usually go completely dark).
Write this value to brightness with the following command:
echo <new_brightness> | sudo tee brightness
If you don't notice a change you might try it a few times with different
brightness values. Let me know which backlight interfaces work and which
ones don't. Thanks!
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/988202
Title:
Ubuntu cannot automatically change brightness of screen and keyboard
backlight in Macbook Air 4,2
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