On Tue, Oct 27, 2015 at 12:23 PM, Michael Burian <michael.burian at sbg.at> 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? Alex -------------- next part -------------- A non-text attachment was scrubbed... Name: 0001-drm-radeon-fix-dpms-when-driver-backlight-control-is.patch Type: text/x-patch Size: 2351 bytes Desc: not available URL: <http://lists.freedesktop.org/archives/dri-devel/attachments/20151027/7192775b/attachment-0001.bin>
