[Bug 89606] New: [BSW] DVI screen is black on some modes when running testdisplay

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89606

            Bug ID: 89606
           Summary: [BSW] DVI screen is black on some modes when running
                    testdisplay
           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 114378
  --> https://bugs.freedesktop.org/attachment.cgi?id=114378&action=edit
dmesg log

==System Environment==
--------------------------
DVI monitor: ASUS PA238Q
BIOS: V59 
Regression: No. First run with DP->DVI adapter

Non-working platforms: BSW

==kernel==
--------------------------
-testing: drm-intel-testing-2015-03-13 (fails)

==Bug detailed description==
-----------------------------
I connected to DVI monitor with DP->DVI cable and run "testdisplay -a", the
screen is black with following modes:
CRTC(20):[2]  1280x1024 75 1280 1296 1440 1688 1024 1025 1028 1066 0x5 0x40
135000
CRTC(20):[5]  1440x900 60 1440 1488 1520 1600 900 903 909 926 0x9 0x40 88750
CRTC(20):[9]  1024x768 75 1024 1040 1136 1312 768 769 772 800 0x5 0x40 78800
CRTC(20):[10]  1024x768 70 1024 1048 1184 1328 768 771 777 806 0xa 0x40 75000


FYI: I connected the DP-DVI cable to DP port in DUT and DVI port in monitor.
"testdisplay -i" shows that there is a "HDMI" connection:
34      33      connected       HDMI-A  510x290         22


==Reproduce steps==
---------------------------- 
1. Connect DVI monitors with DP->DVI adapter and boot
2. testdisplay -a

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