[Bug 363326] Re: Brightness control doesn't work on Amilo mini UI 3520

[David Tombs]

Thanks, Janis. The issue here is either that the laptop has a
proprietary backlight control or the BIOS is slightly broken.

Just in case, can you try running the "current" mainline kernel from the
instructions at <https://wiki.ubuntu.com/KernelTeam/MainlineBuilds>?
This is just to ensure the problem's not specific to Ubuntu and not
fixed already in the next release of the kernel. The keys may still not
work, check /sys/class/backlight/ just to see if the kernel found
anything.

If the mainline kernel doesn't work, then our best hope is to get
upstream linux to work around a bug in the BIOS. If this is the case,
please install acpidump and attach a dump here with the following
commands:

sudo apt-get install acpidump
sudo acpidump -o acpidump.txt

I'll then try to take a look at the dump and determine if it's possible
to workaround it.

I know all this is pretty involved, but at this point it's "let's fix a
problem" instead of "let's find the bug", so you might help add a
feature to linux if we're lucky. :)

-- 
Brightness control doesn't work on Amilo mini UI 3520
https://bugs.launchpad.net/bugs/363326
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