[Intel-gfx] Legacy backlight control with KMS and BACKLIGHT property

[Matthew Garrett]

On Wed, Aug 19, 2009 at 08:12:36AM +0100, Mike Lothian wrote:

> I've already got several bugs open about this laptop on the kernel
> bugzilla. There is also a problem running any 64bit OS. I have to run
> linux with mem=4g to stop it from crashing when unplugging it or
> plugging it into the A/C

Brightness control appears to be SMI based, rather than opregion, so I'm 
at something of a loss as to why it's not working - your firmware should 
be handling it. On the other hand, your firmware is clearly buggy 
failure based on it crashing on various events - there's a patch that 
binds events to running purely on cpu0, which may help here.

-- 
Matthew Garrett | mjg59 at srcf.ucam.org