I have a laptop running Xubuntu 12.10 that doesn't save the brightness setting on reboot. There are some explanations on Ask Ubuntu about how to have a specific brightness be set on reboot, but not how to save the brightness from last time. How can this be done?
Create a Bash script to save the brightness:
sudo nano /etc/acpi/save-brightness.sh
It should contain this:
#!/bin/bash # Saves brightness settings on reboot/shutdown cat /sys/class/backlight/acpi_video0/brightness > /etc/acpi/brightness
Make it executable:
sudo chmod +x /etc/acpi/save-brightness.sh
Switch to the
/etc/rc0.d directory and symlink the script to a link in
cd /etc/rc0.d sudo ln -s ../acpi/save-brightness.sh K99-save-brightness
Do this again in the
/etc/rc6.d directory (
rc0 is for reboots and
rc6 is for shutdowns).
/etc/rc.local to reload the brightness setting on boot.
On a separate line just before the last line that's already there (
exit 0), put:
cat /etc/acpi/brightness > /sys/class/backlight/acpi_video0/brightness