Created attachment 119036 [details] kernel log It sort of works with kernel 4.2 but vlc have some issue with the video overlay, its always on top and no scaling. Also dp MST is not working at all with my dell screen so had to go down to 4k in 30HZ. Trying to use 4.3-rc6 however resulted in no graphics at all. I attached the kernel log. what can be seen is that linux in 4.3 detect the amd graphics cards that it do not in 4.2. but I have in the uefi set the system to use the integrated card so I'm not sure if linux should even start the radeon card. But it later tries to use the intel part and things is not working out ok.
Created attachment 119056 [details] kernel log with drm.debug=14
(Side note, Skylake is not supported on v4.2; on v4.3 you can drop the i915.preliminary_hw_support=1 parameter.) Watermark issues: [ 2.353206] WARN_ON(p->pixel_rate == 0) [ 2.408737] WARN_ON(!wm_changed) Maarten, Matt, do we have something pending for v4.3? Kenneth, can you try drm-intel-nightly branch from http://cgit.freedesktop.org/drm-intel
(In reply to Jani Nikula from comment #2) > (Side note, Skylake is not supported on v4.2; on v4.3 you can drop the > i915.preliminary_hw_support=1 parameter.) > > Watermark issues: > > [ 2.353206] WARN_ON(p->pixel_rate == 0) > [ 2.408737] WARN_ON(!wm_changed) > > Maarten, Matt, do we have something pending for v4.3? > > Kenneth, can you try drm-intel-nightly branch from > http://cgit.freedesktop.org/drm-intel Hmm, actually drm-intel-fixes branch has potentially relevant stuff that's queued for v4.3 - please try that *first*.
Interesting I blacklisted the amdgpu module and now the intel driver works. Has to be some bad interaction. vlc using Xvideo output still has the overlay always on top of everything and it do not scale but at least X starts. Now having a discrete gfx card in a i7 6700k system is probably going to be quite common so I guess we need to find out where things goes wrong to avoid people having to blacklist drivers.
Found another issue. (this on 4.3-rc6 & 4.2.3, amdgpu blacklisted) in google chrome Version 46.0.2490.71 (64-bit) if I have a youtube video playing in its own frame/window then chrome gets very very slow doing anything with any other tab. If I activate another tab so the video is not showing but audio is still then everything is back to normal could be a chrome issue as nothing else in the system gets slow.
dp MST still not working. I turned on MST mode on my dell monitor and instant crach, lockup actually with audio looping, cant get any kernel log from this as nothing ends up on disk and screen is obviously not working. then had a big problem getting the screen back to not use MST as someone at dell thought that it was a good idea to only show the OSD menu when there is valid input and I no longer can get that after I turned on the MST option.
Kenneth, please let's have one issue per bug report.
Presumably Skylake is healthier now, closing. Please reopen if the problem persists with the latest kernels.
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