[Bug 94866] New: [BXT-P/APL][Regression]HDMI monitor display nothing under 4K resolution

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94866

            Bug ID: 94866
           Summary: [BXT-P/APL][Regression]HDMI monitor display nothing
                    under 4K resolution
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: han.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

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.

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