linux-kernel - Re: X200: Brightness broken since 2.6.29-rc4-58-g4c098bc

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Message-id: <alpine.LFD.2.00.0902131302240.3671@localhost.localdomain>
Date:	Fri, 13 Feb 2009 13:05:28 -0500 (EST)
From:	Len Brown <lenb@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Nico Schottelius <nico-linux-20090213@...ottelius.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-acpi@...r.kernel.org
Subject: Re: X200: Brightness broken since 2.6.29-rc4-58-g4c098bc

> > 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


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