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

[Mike Lothian]

2009/8/19 Matthew Garrett <mjg59 at srcf.ucam.org>:
> 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
>

No I've tried that patch and there was no effect :-(

Damn their buggy BIOS