You have been subscribed to a public bug:
After upgrading to Ubuntu 14.10 brightness control no longer works on
Lenovo Thinkpad X220. Fn+Home/Fn+End doesn't work, the only way is to
echo value to:
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight/brightness
I use Awesome WM, but it doesn't seem to be related to Awesome.
** Affects: linux (Ubuntu)
Importance: Low
Status: Incomplete
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Thnikpad X220 - brightness control doesn't work
https://bugs.launchpad.net/bugs/1391153
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