[Bug 88698] New: [BYT]HDMI screen flashes on some modes when running "testdisplay -a"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88698

            Bug ID: 88698
           Summary: [BYT]HDMI screen flashes on some modes when running
                    "testdisplay -a"
           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 112655
  --> https://bugs.freedesktop.org/attachment.cgi?id=112655&action=edit
dmesg log

==System Environment==
--------------------------
Regression: No. I tried drm-intel-testing 2014_12_06 commit
drm-intel-next-queued 2014_12_06 and 2014_11_06 commit, the issue exists too. 

Monitor: ASUS VS239HR, ASUS PA238Q

Non-working platforms: BYT

==kernel==
--------------------------
-testing: 2015_01_18 commit 6dd5bb25ce0ed3a0012b69d553d74e1a0d39c313(test
fails)
-queued: e9413c76eb4c990bd3882d2c2ad1f228819b4e7d(test fails in the same way)
-fixes: 78f4e4767cdde8b50aae44642458fe02c631811d(test fails in the same way)

==Bug detailed description==
-----------------------------
Connect to HDMI display, Boot BYT, login and run "testdisplay -a", HDMI screen
flashes at this mode: 
1920x1080i 60 1920 2008 2052 2200 1080 1084 1094 1125 0x15 0x40 74250


==Reproduce steps==
---------------------------- 
1. Connect to HDMI display, Boot BYT, login 
2. testdisplay -i to get the bad mode, in my testing, it's 20,2
3. Run "./testdisplay -o 20,2"

Note:I tried on both ASUS VS239HR, ASUS PA238Q and saw this issue 
The similar issue happens on VGA, DP screen too.

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