[ltp] Workarounds and tips for thinkpads running 2.6.23/2.6.24

[Henrique de Moraes Holschuh]

On Thu, 07 Feb 2008, Yves-Alexis Perez wrote:
> > Report the backlight level thing to the X.org people, please. 
> 
> You mean opening a bug to the Debian BTS (or x.org buzilla)?

X.org bugzilla.

> > As for turning off the backlight, ACPI cannot do it on thinkpads.  Neither
> > through thinkpad-acpi, nor through ACPI video.  This is very, very unlikely
> > to change.
> 
> Hmh, but why?

Because there is no standard way to do it through ACPI, and Lenovo didn't
provide any non-standard way we know of.

> > If you want to turn the backlight off, by all means use the X.org code and
> > not the kernel.
> 
> If xorg can do it, why can't the kernel?

The *kernel* can, but the right place for it would be the framebuffer
drivers for the Intel and ATI cards.  ACPI video.c and thinkpad-acpi can't,
they have no business writing to GPU registers, or even knowing which GPU
you have...

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh