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indio
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Joined: 13 Mar 2013
Posts: 22

PostPosted: Sun Mar 24, 2013 10:58 pm    Post subject: Brightness control without DE Reply with quote

Hi everyone,

I've got an Intel Atom netbook, so I can only get decent performance if I run a window manager without a DE.
This has been fine, except when it comes to brightness control.

From my efforts googling there should be either a /sys/class/backlight/acpi_video0/brightness file, or /proc/acpi/video/VGA/LCD/brightness for me to mess with. But /sys/class/backlight is an empty folder, and /proc/acpi/video doesn't exist.

Then I was told to run xbacklight -set 100 which returns
Code:
RANDR Query Version returned error -1


Finally I was told to mess around with xrandr, but that simply returns Can't open display, even when run as root.

Any ideas on how to get this working? Thanks a ton.
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Ant P.
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Joined: 18 Apr 2009
Posts: 2403
Location: UK

PostPosted: Mon Mar 25, 2013 1:17 am    Post subject: Reply with quote

Your kernel doesn't have the correct backlight driver enabled, therefore you can't change the backlight from userspace.
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indio
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Joined: 13 Mar 2013
Posts: 22

PostPosted: Mon Mar 25, 2013 2:00 am    Post subject: Reply with quote

Got it. Any way of knowing what driver I need or if there even is an appropriate driver for my hardware?
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