*** This bug is a duplicate of bug 568611 ***
https://bugs.launchpad.net/bugs/568611
On my Toshiba Satellite R830, I can't change brightness after returning from
sleep with Fn-keys, but echoing numbers to
/sys/class/backlight/intel_backlight/brightness does change the brightness
properly.
It seems that Fn keys write to /sys/class/backlight/acpi_video0/brightness,
which doesn't do anything.
Perhaps a fix could be made in Unity (or gnome power manager) to prefer
intel_brightness if it's available?
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https://bugs.launchpad.net/bugs/780625
Title:
"acpi_backlight=vendor" needs to be present in kernel cmdline to have
backlight working
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