Comment 23 for bug 280518

Steve Langasek (vorlon) wrote :

Jeremy,

Please check the contents of the following files:

$ cat /sys/devices/virtual/backlight/acpi_video0/brightness
$ cat /sys/devices/virtual/backlight/acpi_video0/max_brightness
$ cat /sys/devices/virtual/backlight/acpi_video0/actual_brightness

and as root, try to change the value of the 'brightness' file:

# echo 2 > /sys/devices/virtual/backlight/acpi_video0/brightness

Does this change the brightness of your display?