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

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Message-Id: <1234775219.4998.1.camel@rzhang-desktop>
Date:	Mon, 16 Feb 2009 17:06:59 +0800
From:	ZhangRui <rui.zhang@...el.com>
To:	Len Brown <lenb@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	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" <linux-acpi@...r.kernel.org>
Subject: Re: X200: Brightness broken since 2.6.29-rc4-58-g4c098bc

hi, Nico,

do you have an external graphics card as well as the integrated intel
graphics on your laptops?

please attach the dmesg and lspci output.

thanks,
rui




On Sat, 2009-02-14 at 02:05 +0800, Len Brown wrote:
> > > 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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