19 Sep
2012
19 Sep
'12
12:26 a.m.
On Mon, Sep 17, 2012 at 10:21 PM, Genes MailLists <lists@sapience.com> wrote:
unplugging a/c and going to battery - laptop beeps - but screen no longer dims -
Again - I can dim screen by hand by doing something like this:
echo '11' > /sys/class/backlight/acpi_video0/brightness
This has been flaky a while but usually worked at least some of the time - now its just not working period.
Good tip, didn't knew about it. In my particular case I need to add acpi_backlight=vendor to the kernel line in order to be able to control screen bright with the fn+function keys combination (only in KDE SC, this don't work in dwm or Awesome), may be you can try this to solve your problem.