[Bug 84303] New: [BSW]Monitor losts signal on some interlaced resolutions.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84303

          Priority: medium
            Bug ID: 84303
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BSW]Monitor losts signal  on some interlaced
                    resolutions.
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: lei.a.liu at intel.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 106824
  --> https://bugs.freedesktop.org/attachment.cgi?id=106824&action=edit
dmesg

==System Environment==
--------------------------
Regression: This is first time I test this machine, and I fail to find a good
commit.

Non-working platforms: Braswell

==kernel==
--------------------------
-nightly: 1c38dbc94bc61e685c72994cc9e634d4eb8c4da1 (fails)
    drm-intel-nightly: 2014y-09m-23d-14h-26m-24s UTC integration manifest
-queued: 9adccc6063d1cf6ba38a5a26b87001554105be18 (fails)
    drm/i915: add SW tracking to FBC enabling
-fixes: c84db77010877da6c5da119868ed54c43d59e726 (fails to light monitor up
since boot)
    drm/i915/hdmi: fix hdmi audio state readout

==Bug detailed description==
-----------------------------
Monitor losts signal  on some interlaced  resolutions.

Resolutions Detail:
1920x1080i 60 1920 2008 2052 2200 1080 1084 1094 1125 0x15 0x40 74250
1920x1080i 60 1920 2008 2052 2200 1080 1084 1094 1125 0x15 0x40 74176
1920x1080i 50 1920 2448 2492 2640 1080 1084 1094 1125 0x15 0x40 74250

==Reproduce steps==
---------------------------- 
1. ./testdisplay -o ConnectorsID,mode (interlaced resolution)
2. Check DP monitor

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