Update -
# ls /sys/class/backlight has three listings
acpi_video0 acpi_video1 intel_backlight
# cat /sys/class/backlight/intel_backlight/max_brightness
976
# echo 100 > /sys/class/backlight/intel_backlight/brightness
bash: /sys/class/backlight/intel_backlight/brightness: Permission denied
# sudo -s
root# echo 100 > /sys/class/backlight/intel_backlight/brightness
This last command worked and my brightness was changed successfully. I
tried other values too, and they all seem to work. I didn't try going
beyond the max_brightness value, of course.
Is there something else I could try that would help in narrowing down
and / or fixing this bug?
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https://bugs.launchpad.net/bugs/1207487
Title:
Brightness Controls work but brightness doesnt change
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