[Bug 198071] Re: Cannot control brightness / backlight of Dell notebook

[Christian Schuerer]

In some discussions I read that it should be possible to set the
brightness via /proc/acpi/video/VID/LCD/brightness, but this seems not
to be supported:

cat /proc/acpi/video/VID/LCD/brightness
<not supported>

Again, I can change the brightness via the FN-keys - only changing by
software doesn't work - and any program trying to change the brightness
hangs with an error message:

Warning: in getBrightness():  org.freedesktop.DBus.Error.NoReply: Did
not receive a reply. Possible causes include: the remote application did
not send a reply, the message bus security policy blocked the reply, the
reply timeout expired, or the network connection was broken.

-- 
Cannot control brightness / backlight of Dell notebook
https://bugs.launchpad.net/bugs/198071
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