[Bug 69128] New: [IVB Apple MacBook pro] miniDP-to-HDMI cause machine boot up with "ERROR"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69128

          Priority: medium
            Bug ID: 69128
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [IVB Apple MacBook pro] miniDP-to-HDMI cause machine
                    boot up with "ERROR"
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: yangweix.shui at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 85479
  --> https://bugs.freedesktop.org/attachment.cgi?id=85479&action=edit
dmesg: miniDP-to-VGA cause machine boot up with "ERROR"

Environment:
-------------------
Kernel: (drm-intel-next-queued)da66146425c3136943452988afd3d64cd551da58
Author: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Date:   Fri Sep 6 16:03:28 2013 +0300

    drm/i915: include hangcheck action and score in error_state

lspci:
--------------------
00:02.0 VGA compatible controller: Intel Corporation Device 0162 (rev 09)

Description:
--------------------
When machine boot up with miniDP-to-VGA, there's "Error" in dmesg. I have tried
many older kernels, and can't find a good commit.
Both -next-queued and -fixes branches reproducible.
Other IVB machines like desktop and mobile haven't come up such issue. 
Other display adapter like miniDP-to-DVI/DP/HDMI work well.

Test Step:
--------------------
1. plugged in miniDP-to-VGA
2. reboot machine
3. check dmesg

Error type:
-------------------
[drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up

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