[PATCH] drm/radeon: add new AMD ACPI header and update relevant code

[Alex Deucher]

On Thu, Jul 26, 2012 at 3:33 PM, Luca Tettamanti <kronos.it at gmail.com> wrote:
> On Thu, Jul 26, 2012 at 11:35:25AM -0400, Alex Deucher wrote:
>> On Thu, Jul 26, 2012 at 8:58 AM, Luca Tettamanti <kronos.it at gmail.com> wrote:
>> > The other missing bit is how to actually change the brightness... Alex,
>> > do you know what registers to poke?
>>
>> You need to check if the GPU controls the backlight or the system
>> does.  I think the attached patches should point you in the right
>> direction.
>
> Yep :)
>
> 0050:  ATOM_FIRMWARE_CAPABILITY_ACCESS usFirmwareCapability :
>   0050:  (union) ATOM_FIRMWARE_CAPABILITY sbfAccess          :
>     USHORT GPUControlsBL:1                              = 0x0001     (1)
>
> The panel is using the INTERNAL_UNIPHY encoder, and I see the
> UNIPHYTransmitterControl command table.
>
> Interaction with video.ko is still a bit messy...
>
> Do you already have code for handling the notifications? I'll work on it
> in the weekend otherwise ;)

I don't have patches for that.  Please feel free to work on it :)

Thanks,

Alex