No backlight since linux-4.2.4 - drivers/gpu/drm/radeon/atombios_encoders.c

[Michael Burian]

On 10/27/15 16:10, Alex Deucher wrote:

> 
> It would appear that your system does not use the gpu backlight
> controller.  Either it's lying or messing with the GPU backlight
> controller causes some bad interaction with whatever does control it.
> Does the attached radeon patch help?  I'm also attaching an amdgpu
> patch for reference in case the same problem appears on amdgpu.
> 

no, still no backlight when applied against current current mainline

858e904bd71dd0057a548d6785d94ce5ec4aeabd (Merge tag 'iommu-fixes-v4.3-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu)