[Bug 89601] New: [BSW] Sometimes dmesg shows " *ERROR* EDID checksum is invalid" when connected with HDMI monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89601

            Bug ID: 89601
           Summary: [BSW] Sometimes dmesg shows " *ERROR* EDID checksum is
                    invalid" when connected with HDMI monitor
           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 114368
  --> https://bugs.freedesktop.org/attachment.cgi?id=114368&action=edit
dmesg when boot is fine but hot plug shows ERROR

==System Environment==
--------------------------
HDMI monitor: ASUS PA238Q
BIOS: V59 
Regression: No. Tried on testing 01-30 and still saw this issue.

Non-working platforms: BSW

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

==Bug detailed description==
-----------------------------
When connected ASUS PA238Q monitor with HDMI cable, sometime dmesg shows 
[    2.397263] [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is
invalid, remainder is *

Sometimes reboot the system has such error, in this case HDMI monitor is black.
"testdisplay -i" may/maynot light the monitor.

When booting system does not show the message, hot plug in/out HDMI cable might
also get such error.

==Reproduce steps==
---------------------------- 
1. Connected ASUS PA238Q with HDMI cable and boot
2. Hot plug in/out HDMI cable
3. dmesg

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