[ltp] ibm-acpi brightness problems on the X60

[Yves-Alexis Perez]

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On jeu, 2008-03-20 at 11:50 -0300, Henrique de Moraes Holschuh wrote:
>=20
> But X.org on Intel GPUs can also tell the BIOS to hand's off the
> backlight,
> so if you don't have thinkpad-acpi or ACPI video loaded, and things
> still
> don't work, you have to check if it is not X.org's doing.
>=20
> But even with X.org blocking it, AFAIK, it unblocks things when the
> user is
> in a text-mode VT.  Just make sure you have the latest intel driver
> for
> X.org.

Yeah, backlight with intel stuff is kind of confusing currently. I'm
running 2.6.25-rc6 on a T61 and the backlight can't be controlled
through the sysfs interface. Currently, the only way to control it is
using xbacklight, but only using the =E2=80=9Clegacy=E2=80=9D interface. =
=E2=80=9Ckernel=E2=80=9D one
doesn't work (I guess it's the same thing as echo'ing something
is /sys/class/backlight/acpi_video0/brightness).

I've reported this to xorg intel guys
( http://bugs.freedesktop.org/show_bug.cgi?id=3D14462 ) but it's not
really helpful currently.

Cheers,
--=20
Yves-Alexis

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