Re: brightness control somehow broken on my Z61m

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On Mon, 16 Apr 2007 18:06:07 +0200 Evgeni Golov wrote:

> On Mon, 16 Apr 2007 11:20:36 -0300 Henrique de Moraes Holschuh wrote:
> 
> > Make triple sure the ACPI video driver is not loaded.  Does that fix
> > things?
> 
> CONFIG_ACPI_VIDEO=m
> module isn't loaded (I AM sure ;))
> 
> This "bug" applies to 2.6.19.2, 2.6.20.4 and 2.6.21-rc7 :(

I did some more "debugging"...

Fn+(brightness-up|brightness-down) controls the brightness and writes
nvram - tpb is able to get these and displays the changes correctly.

After the boot I get a 0 in /sys and /proc, when I echo some value
there, it is stored correctly and the brightness gets changed. After
removing and loading ibm-acpi the value is still there, but won't be
changed by the keys (but the brightness changes).

Removing tpb does not change anything.

I think this can be a bug/feature in the BIOS which has changed? (I'm
pretty sure this worked before - can I downgrade the BIOS with the
ibm-bootcds without complications?)

Regards
Evgeni

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