[ltp] /proc/acpi/ibm/brightness does not exist

[Henrique de Moraes Holschuh]

On Mon, 16 Jul 2007, Robert D. Crawford wrote:
> screen brightness is only dropping slightly on unplugging.  Tracking the

That's the standard dim-display-a-bit-on-battery stuff the BIOS does.

> problem down I realized there is no /proc/acpi/ibm/brightness.  I think

Is there a /proc/acpi/ibm at all?  If not, you're missing ibm-acpi.

> video

Remove ACPI video. 2.6.18's version of it is broken beyond repair.

> I have only been running this particular install for 3 days now.  My
> previous sid install went south on an upgrade.  On the previous install
> I never saw this problem, upgrading through several kernels over more
> than a year of use.

Well, ibm-acpi on 2.6.18 is quite... crusty.  Try at least the newest one
for 2.6.18 I have in ibm-acpi.sf.net, hopefully it will either just work, or
it will have better debug output that can help me track down what is wrong.

Still, for a T40, I'd use a 2.6.20 or 2.6.21 kernel, and the latest
thinkpad-acpi and tp_smapi.

-- 
  "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