[Bug 68643] New: [SNB DP]Some modes can't light up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68643

          Priority: medium
            Bug ID: 68643
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [SNB DP]Some modes can't light up
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: cancan.feng at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 84775
  --> https://bugs.freedesktop.org/attachment.cgi?id=84775&action=edit
system boots and sets display modes

System Environment:
--------------------------
Kernel: (drm-intel-nightly)94814d0f36b38c38700bee6ef64de44a32601cba
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Aug 26 19:51:00 2013 -0300

    drm/i915: Always prefer CPU relocations with LLC

Bug Details:
--------------------------
These two modes can't light up on DP. 

[2]  1856x1392 60 1856 1952 2176 2528 1392 1393 1396 1439 0x6 0x40 218250
[3]  1792x1344 60 1792 1920 2120 2448 1344 1345 1348 1394 0x6 0x40 204750

This is the first time I use the monitor which has these two modes, we bought
this monitor some time ago.

I attach the dmesg of system booting and setting this two modes.

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