Date: Sat, 22 Dec 2007 00:21:57 -0800 (PST)
From: Andrei Gaponenko <andrei.gaponenko@cern.ch>
To: Zhang Rui <rui.zhang@intel.com>
cc: linux-kernel@vger.kernel.org, corentincj@iksaif.net,
       sziwan@users.sourceforge.net
Subject: Re: video breaks asus-laptop display switching
In-Reply-To: <1198309997.9550.2.camel@acpi-sony>
Message-ID: <Pine.LNX.4.64.0712220013030.31611@roof>
References: <Pine.LNX.4.64.0712211433030.3239@0-11-d8-ea-8d-5b.dhcp.lbl.gov>
 <1198309997.9550.2.camel@acpi-sony>
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On Sat, 22 Dec 2007, Zhang Rui wrote:

> On Sat, 2007-12-22 at 06:36 +0800, Andrei Gaponenko wrote:
>>
>> With 2.6.23 or newer (including 2.6.24-rc6) kernels, writing to the
>> /sys/devices/platform/asus-laptop/display file does not do anything:
>> ...
>>
> hmm, please "echo 1 > /proc/acpi/video/xxx/DOS" in 2.6.23 and see
> if there is any difference.

ls /proc/acpi/video/
shows two identically named directories "VGA" - is this normal??

Anyway,

# cat VGA/DOS
DOS setting: <1>

# echo 3 > VGA/DOS
# cat VGA/DOS
DOS setting: <3>

but no image on external.  Now

# rmmod video
# echo 3 > /sys/devices/platform/asus-laptop/display

Got image on external

# modprobe video
# cat VGA/DOS
DOS setting: <0>

I can write 1 or 3 to DOS and read it back, but it has no effect (image on 
external turned on while video module was removed does not go away).

Please Cc: me on replies - forgot to mention this in the initial posting.

Thanks!
Andrei
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