[Bug 66952] New: [IVB Regression: Apple MacBook Pro] eDP + two any pipes will cause call trace in dmesg

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66952

          Priority: medium
            Bug ID: 66952
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [IVB Regression: Apple MacBook Pro] eDP + two any
                    pipes will cause call trace in dmesg
        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 82471
  --> https://bugs.freedesktop.org/attachment.cgi?id=82471&action=edit
dmesg: eDP + two any cause call  trace

Environment:
--------------------
Kernel: (drm-intel-next-queued)50b44a449ff1a19712ebc36ffccf9ac0a68033bf
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Wed Jun 5 13:34:33 2013 +0200

    drm/i915: clear DPLL reg when disabling i9xx dplls

Good commit: 328d8e829b9a05814af4722c1091d62c5533c4f8


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

Description:
--------------------
With eDP and two any pipes plugged in, there's "call trace" in dmesg when
machine resumed from booting. If I plugged each pipe only, there's not this
issue. Our Apple MacBook Pro support: HDMI , mini-DP-to-HDMI, mini-DP-to-VGA,
mini-DP-to-DVI and mini-DP-to-DP.

Bisect is on the way, we will update the bug ASAP. This machine is not support
kexec currently, we need take much more time by manual. If you have any idea
about this regression, please comment. THX.

Reproduce step:
--------------------
1. plugged two any pipes in
2. reboot
3. check the dmesg when machine boot up

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