[Bug 88963] New: [BSW] DP screen is black when running testdisplay on some modes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88963

            Bug ID: 88963
           Summary: [BSW] DP screen is black when running testdisplay on
                    some modes
           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 113149
  --> https://bugs.freedesktop.org/attachment.cgi?id=113149&action=edit
dmesg log

==System Environment==
--------------------------
BIOS: V55 with 'dynamic memory self refresh' disabled
DP monitor: ASUS PA238Q

Regression: No. I don't find a working version (tried on -nightly 2014-12-06
commit bfdd01aa1825aa0068f9236b21362b550f6d630f and this issue still exists)

Non-working platforms: BSW

==kernel==
--------------------------
-testing: 2015_01_30 commit 4d3645e40c7039f60b6db0ce9c2251ac34faef81 (fails)
-fixes: 2015_02_04 commit 6b96d705f3cf435b0b8835b12c9742513c77fed6 (fails)


==Bug detailed description==
-----------------------------
Running "testdisplay -a", DP screen is black on following modes 
[2]  1920x1080i 60 1920 2008 2052 2200 1080 1084 1094 1125 0x15 0x40 74250
[3]  1920x1080i 60 1920 2008 2052 2200 1080 1084 1094 1125 0x15 0x40 74176
[5]  1920x1080i 50 1920 2448 2492 2640 1080 1084 1094 1125 0x15 0x40 74250

==Reproduce steps==
---------------------------- 
1. Run "testdisplay -a"
2. Check output of DP
3. Same issue if running "testdisplay -d/-t"

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