Comment 2 for bug 1028518

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Redsandro (redsandro) wrote :

For reference purposes, here's how to set that brightness in case of emergencies without the Fn keys:

Set the value of:
/sys/class/backlight/acpi_video0/brightness
to a value between 1 and max, where max is:
/sys/class/backlight/acpi_video0/max_brightness

Note that you can't just sudo echo it in there. (???) You'll need to pipe-feed it, e.g.:
echo 15 | sudo tee /sys/class/backlight/acpi_video0/brightness