[intel/acpi] backlight

[Yves-Alexis Perez <corsac@debian.org>]

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Hi,

I'm running linux 2.6.28-rc6-00007-ged31348 on my Thinkpad T61, with
Intel GM965. Under X, brightness keys work fine most of the time, but in
some case it fails (for example after a dpms force off, but not always).
Switching to console and back to X fix the problem for a time.

Another weird stuff is that, in single user, I have no way to control
the backlight. Using brightness key doesn't work,
and /sys/class/backlight/acpi_video0 doesn't do anything.

I know there was a lot of enhancements with OpRegion stuff for 2.6.27
and 2.6.28, and it's maybe not finished, but are those problems known?

Cheers, and many thanks for the good work :)
-- 
Yves-Alexis

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