Re: [regression] Re: Controlling backlight on thinkpad x60

From: Pavel Machek
Date: Tue Sep 09 2008 - 12:38:10 EST

On Tue 2008-09-09 17:28:59, Pavel Machek wrote:
> On Mon 2008-09-08 16:54:58, Matthew Garrett wrote:
> > On Mon, Sep 08, 2008 at 05:10:58PM +0200, Pavel Machek wrote:
> >
> > > (I do have CONFIG_ACPI_VIDEO disabled, it killed my machine last time
> > > I enabled it, is it mandatory now?)
> >
> > On Thinkpads with ACPI video support, yes.
> That's bad then, because ACPI video support does not work here. I can
> boot, and even Fn-home/end works, but it breaks with X.
> In old versions, it resulted on black screen after LID close in X.
> In 2.6.27-rc5, screen goes black as soon as X are started.

Hmm, I have updated my X server, and it now works with
ACPI_VIDEO... which means that this is probably not affecting huge
number of people.

Hmm... something is still funny. I have

root@amd:/sys/class/backlight/acpi_video0# echo 1 > brightness
root@amd:/sys/class/backlight/acpi_video0# echo 0 > brightness
root@amd:/sys/class/backlight/acpi_video0# cd ../acpi_video1/
root@amd:/sys/class/backlight/acpi_video1# echo 0 > brightness
root@amd:/sys/class/backlight/acpi_video1# echo 7 > brightness
root@amd:/sys/class/backlight/acpi_video1# echo 0 > brightness

...and both acpi_video0 *and* acpi_video1 works... strange.
(cesky, pictures)
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at