[Bug 69790] New: [HSW ULT] testdisplay : The output of 720x576 mode is dislocated

[Bug 69790] New: [HSW ULT] testdisplay : The output of 720x576 mode is dislocated

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=69790

          Priority: medium
            Bug ID: 69790
          Assignee: dri-devel@lists.freedesktop.org
           Summary: [HSW ULT] testdisplay : The output of 720x576 mode  is
                    dislocated
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: qingshuai.tian@intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: libdrm
           Product: DRI

Created attachment 86503
  --> https://bugs.freedesktop.org/attachment.cgi?id=86503&action=edit
dmesg: 720x576 mode dislocated

System Environment:
--------------------------------------------
Kernel: (drm-intel-next-queued)1b068ee25776533074251f1c6276c5f720c0284b
Some additional commit info:
Author: Jani Nikula <jani.nikula@intel.com>
Date:   Fri Sep 20 16:42:17 2013 +0300

    drm/i915/dp: read DPCD PSR capability only on eDP


Description:
--------------------------------------------
When I test display in 720x576  mode with argument -a,-d or -t,the image
dislocated.

CRTS(3):[0]  720x576 50 720 732 796 864 576 581 586 625 0xa 0x40 27000



Reproduce steps:
--------------------------------------------
1. plug in HDMI
2. boot up machine
3. testdisplay

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[Bug 69790] [HSW ULT] testdisplay : The output of 720x576 mode is dislocated

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https://bugs.freedesktop.org/show_bug.cgi?id=69790

--- Comment #1 from Qingshuai Tian <qingshuai.tian@intel.com> ---
Created attachment 86504
  --> https://bugs.freedesktop.org/attachment.cgi?id=86504&action=edit
The dislocated picture

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[Bug 69790] [HSW ULT] testdisplay : The output of 720x576 mode is dislocated

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=69790

--- Comment #2 from Ville Syrjala <ville.syrjala@linux.intel.com> ---
I managed to reproduce this on my HSW. But it seems that it's somehow random as
it doesn't happen every time. It's rather hard to reproduce actually when you
just retry the same mode w/ 'testdisplay -o'.

There's no difference in dmesg between a good and bad modesets using the same
mode.

As it stands, I don't have any good ideas as to what might be happening.

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[Bug 69790] [HSW ULT] testdisplay : The output of 720x576 mode is dislocated

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https://bugs.freedesktop.org/show_bug.cgi?id=69790

Guang Yang <guang.a.yang@intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Hardware|Other                       |All
                 OS|All                         |Linux (All)
           Assignee|dri-devel@lists.freedesktop |intel-gfx-bugs@lists.freede
                   |.org                        |sktop.org
         QA Contact|                            |intel-gfx-bugs@lists.freede
                   |                            |sktop.org
                 CC|                            |intel-gfx-bugs@lists.freede
                   |                            |sktop.org
          Component|libdrm                      |DRM/Intel

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