[ltp] Display brightness

[Henrique de Moraes Holschuh]

On Mon, 03 Mar 2008, Joerg Platte wrote:
> I'm using a vanilla 2.6.24.3 kernel with thinkpad_acpi version 0.17 and the 
> latest BIOS version 1RETDRWW (3.23 ).

Thanks.  I will look into it.

> > What you really need to do is to hunt down whatever else in userspace is
> > touching the thinkpad NVRAM and get rid of it.  Look for KDE or GNOME
> > "thinkpad support" utilities and applets, for example.  Any of them which
> > can change brightness are prime suspects.
> 
> Hmmm, KDE, or in this case, kpowersave, changes the brightness intentionally 
> each time the notebook is idle for some time. This works most of the time, 

Does it manage to change brightness even when you don't have thinkpad-acpi
loaded (i.e. is it doing things directly to the NVRAM)?

> but not aways. It looks like it is getting worse after I replaced the 
> mainboard. The old one had a radeon 9000 and the new one has a radeon 7500.

Timings could be different, and this is indeed brokeness induced by a race
condition, so it is possible the swap made the problem worse, indeed.

-- 
  "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