From mboxrd@z Thu Jan  1 00:00:00 1970
From: Len Brown <lenb@kernel.org>
Subject: Re: X200: Brightness broken since 2.6.29-rc4-58-g4c098bc
Date: Fri, 13 Feb 2009 13:05:28 -0500 (EST)
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References: <20090213093354.GA10175@denkbrett.schottelius.org>
 <20090213094200.GC17774@elte.hu>
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To: Ingo Molnar <mingo@elte.hu>
Cc: Nico Schottelius <nico-linux-20090213@schottelius.org>, LKML <linux-kernel@vger.kernel.org>, Matthew Garrett <mjg@redhat.com>, "Rafael J. Wysocki" <rjw@sisk.pl>, Andrew Morton <akpm@linux-foundation.org>, linux-acpi@vger.kernel.org

> > When using
> >   - vmlinuz-2.6.29-rc4-ikn-00058-g4c098bc or
> >   - vmlinuz-2.6.29-rc4-ikn-00211-g37bed90
> > 
> > the brightness of the LCD is almost off (lowest level),
> > although kernel reports otherwise:
> > 
> > [10:31] ikn:~% cat /proc/acpi/video/VID/LCD0/brightness 
> > levels:  20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 100
> > current: 100
> > 
> > Changing the brightness via echo 20 > /proc/acpi/video/VID/LCD0/brightness
> > only changes the value displayed, the display always keeps the same
> > brightness.
> > 
> > The last time I saw it working was vmlinuz-2.6.29-rc4-ikn-00001-gd5b5623.

Nico,
there are not a lot of changes between rc4 and the breakage,
(and none of them jump out at me) can you git-bisect?

thanks,
Len Brown, Intel Open Source Technology Center