[Bug 72743] New: [HSW ULT/IVB]I-G-T/testdisplay mode 1440x240 overscan

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72743

          Priority: medium
            Bug ID: 72743
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW ULT/IVB]I-G-T/testdisplay  mode 1440x240 overscan
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: qingshuai.tian at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 90819
  --> https://bugs.freedesktop.org/attachment.cgi?id=90819&action=edit
Image of the monitor on 1440x240 mode

Environment:
--------------------------------------------
Kernel: (drm-intel-next-queued)df4547d82589714f1b0cecd93569130a452cbf46
Platform: HSW ULT/IVB

Description:
--------------------------------------------
When I tested I-G-T/testdisplay with a new monitor which supports 1440x240 mode
on a HSW ultrabook(Lenovo u330p), I found that the 1440x240 mode can't show
competely on the screen(a little incomplete on the left side of the image). I
took a picture and attached it in the attachment. And the dmesg.

All of the modes that no completely showed:
[33]  1440x240 60 1440 1478 1602 1716 240 244 247 262 0x100a 0x40 27027
[35]  1440x240 60 1440 1478 1602 1716 240 244 247 262 0x100a 0x40 27000

Reproduce steps:
--------------------------------------------
1. boot a machine
2. ./testdisplay -a

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