[Bug 89002] New: [BSW] testdisplay shows black screen for HDMI 4K monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89002

            Bug ID: 89002
           Summary: [BSW] testdisplay shows black screen for HDMI 4K
                    monitor
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jeff.zheng at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 113217
  --> https://bugs.freedesktop.org/attachment.cgi?id=113217&action=edit
dmesg with 4K monitor

==System Environment==
--------------------------
BIOS: V55 with 'dynamic memory self refresh' disabled

Regression: No. First test on 4K monitor

Non-working platforms: BSW

==kernel==
--------------------------
-testing: 2015_01_30 commit 4d3645e40c7039f60b6db0ce9c2251ac34faef81 (fails)

==Bug detailed description==
-----------------------------
Running "testdisplay -a", HDMI screen is black on following modes 
CRTC(30):[0]  3840x2160 30 3840 4016 4104 4400 2160 2168 2178 2250 0x5 0x48
297000
CRTC(30):[1]  3840x2160 30 3840 4016 4104 4400 2160 2168 2178 2250 0x5 0x40
296704
CRTC(30):[2]  3840x2160 25 3840 4896 4984 5280 2160 2168 2178 2250 0x5 0x40
297000
CRTC(30):[3]  3840x2160 24 3840 5116 5204 5500 2160 2168 2178 2250 0x5 0x40
297000
CRTC(30):[4]  3840x2160 24 3840 5116 5204 5500 2160 2168 2178 2250 0x5 0x40
296704
CRTC(30):[5]  1920x1200 60 1920 1968 2000 2080 1200 1203 1209 1235 0x9 0x40
154000
CRTC(30):[6]  1920x1080 60 1920 2008 2052 2200 1080 1082 1087 1125 0x5 0x40
148500
CRTC(30):[7]  1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 0x5 0x40
148500
CRTC(30):[8]  1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 0x5 0x40
148352
...

==Reproduce steps==
---------------------------- 
1. Run "testdisplay -a"
2. Check output of DP

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