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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