linux-kernel - Re: video breaks asus-laptop display switching

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Message-Id: <1198309997.9550.2.camel@acpi-sony>
Date:	Sat, 22 Dec 2007 15:53:17 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Andrei Gaponenko <andrei.gaponenko@...n.ch>
Cc:	linux-kernel@...r.kernel.org, corentincj@...aif.net,
	sziwan@...rs.sourceforge.net
Subject: Re: video breaks asus-laptop display switching


On Sat, 2007-12-22 at 06:36 +0800, Andrei Gaponenko wrote:
> 
> Hi,
> 
> 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:
> 
> Cold boot to single user, then connect an external monitor
> 
> # cat  /sys/devices/platform/asus-laptop/display
> 1
> 
> OK, only the built in LCD is enabled. Try to enable
> the external monitor as well:
> 
> # echo 3 > /sys/devices/platform/asus-laptop/display
> 
> still no image on the external.
> 
> # cat  /sys/devices/platform/asus-laptop/display
> 1
> 
> Still "1", not the "3" we wrote. On the other hand if I boot with an
> external monitor attached, the "display" file always contains 3, even
> after writing 1 there, and there is image on both monitors.
> 
> In 2.6.22 I had to load asus-laptop by hand, but then display
> switching worked nicely. 
> 
> I've noticed that if I do
> 
> # rmmod video
> 
> display switching starts working again with the newer kernels.
> The "video" module was auto-loaded on my system in 2.6.22, but
> did not cause the conflict.
hmm, please "echo 1 > /proc/acpi/video/xxx/DOS" in 2.6.23 and see
if there is any difference.

Thansk,
Rui


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