[Nouveau] NV50 backlight brightness

[Aaron Sowry]

On Wed, Oct 20, 2010 at 09:17:39PM +1000, Ben Skeggs wrote:
> I have a question to you that's important first:  if you fix nouveau's
> max_brightness level, can you actually properly change the brightness?
> 
> I have an eDP laptop that shows the same backlight level regardless of
> what's in that register.
> 

By applying the attached patch I can properly change the brightness levels using g-p-m. The only question is what the 0x40000000 bit represents as set by BIOS/ACPI - both 0x40001fff and 0x00001fff seem to work fine as far as brightness levels are concerned.
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