On 28.10.2015 01:43, Alex Deucher wrote: > On Tue, Oct 27, 2015 at 12:23 PM, Michael Burian <michael.burian@xxxxxx> wrote: >> 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) >> > > I see the problem. We don't enable native backlight control on older > asics like yours by default. Does the attached patch help? My only doubt about this patch is: Should we also fall back to the old beahviour in the !(rdev->mode_info.firmware_flags & ATOM_BIOS_INFO_BL_CONTROLLED_BY_GPU) case? -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
