System Environment Platform: Apollo lake RVP1a FabA BIOS: APLKRVPA.X64.0125.B30.1602180044 KSC FW:1.10 BXT SOC : B0 GOP : 10.0.1025 Board ID: APL RVP 1A (01) CPU Flavor: BXT Tablet (0) FAB ID: FAB1 Total Memory : 8GB Kernel:4.6.0-rc1 Tree: git://anongit.freedesktop.org/drm-intel Branch:drm-intel-nightly Commit: 2702045fbd4188c1c26bd890bc43976fd10937ad HW-rework: F-28C, F-27 Bug detailed description HDMI monitor display nothing under 4K resolution. Reproduce Steps 1.$ xinit & 2.$ xrandr --output HDMI2 --mode 3840x2160 Expected Result HDMI monitor display normal under 4K resolution. Actual Result display nothing.
The issue is reproduced on APL B0 with F-28C and F-27 rework, not reproduced on A0.
Created attachment 122815 [details] dmesg Keqiao captured the dmesg with drm.debug=14
Does it work with a lower resolution for the HDMI output? Can you provide the log for the successful modeset with the same display outputs on the A0? Please try if the following patch helps: https://lists.freedesktop.org/archives/intel-gfx/2016-March/090016.html
The issue does not exists with lower resolutions on HDMI output. Good news is, with the patch on your link, the issue is not reproduced on B0. Is the patch on processing of upstream?
(In reply to Lu, Han from comment #4) > The issue does not exists with lower resolutions on HDMI output. > Good news is, with the patch on your link, the issue is not reproduced on > B0. Is the patch on processing of upstream? Ok, thanks for testing it. Yes I'm going to merge the patch.
Fix merged to drm-intel-nightly.
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