[Nouveau] NV50 backlight brightness

[Ben Skeggs]

On Thu, 2010-10-21 at 11:16 +0200, Aaron Sowry wrote:
> 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.
Ok.  I'll look at all the kmmio/vbios data I have tomorrow, and come up
with some kind of "solution", it'll likely require tweaking as we see
more data.

What value does 0x610084 contain on boot for you?

Ben.