Cody, the current version of my script works only with one graphical adapter
(its brightness file is named /sys/class/backlight/acpi_video0/brightness).
You can customize this value in my script at row 16
BRIGHTNESS_CONTROL=/sys/class/backlight/acpi_video0/brightness
to path which is *correct* for your hardware.
Correct path may be determined by the following steps:
1. List all paths with brightness file in /sys/class/backlight dir with the
command
ls /sys/class/backlight/*/brightness
example:
/sys/class/backlight/acpi_video0/brightness
/sys/class/backlight/acpi_video1/brightness
2a. Read values of brightness from files with the command:
cat /sys/class/backlight/*/brightness
example:
3
8
2b. Change backlight level with hardware keys (Fn+...) and read again:
cat /sys/class/backlight/*/brightness
example:
4
8
2c. The *correct* path to brightness control file corresponds to the changed
value.
example:
/sys/class/backlight/acpi_video0/brightness # first value changed, so
first file
3. Try to write brightness level manually to *correct* brightness file:
sudo su
echo 3 > /sys/class/backlight/acpi_video0/brightness # example on my
hardware
4. Change BRIGHTNESS_CONTROL variable to the *correct* path in
/etc/init.d/brightness with the command
sudo gedit /etc/init.d/brightness
I'll update my script soon to do all steps automatically.
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https://bugs.launchpad.net/bugs/1270579
Title:
Ubuntu should have an upstart job for saving/restoring backlight level
on laptops
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