[Bug 69691] New: [HSW Desktop VGA bisected]WARNING:pipe state mismatch:mismatch in pipe_bpp (expected 24, found 0)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69691

          Priority: medium
            Bug ID: 69691
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW Desktop VGA bisected]WARNING:pipe state
                    mismatch:mismatch in pipe_bpp (expected 24, found 0)
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: cancan.feng at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

System Environment:
--------------------------------------------
Kernel: (drm-intel-next-queued)42571aefafb1d330ef84eb29418832f72e7dfb4c
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Fri Sep 6 23:29:00 2013 +0300

    drm/i915: Add support for pipe_bpp readout

Bug detailed description:
--------------------------------------------
System booting up with VGA will result in "*ERROR* mismatch in pipe_bpp
(expected 24, found 0)", this is a regression, I have bisected it. I will
attach the whole dmesg of 42571a, in which you can find the details of Call
Trace.

Bisect result:
--------------------------------------------
42571aefafb1d330ef84eb29418832f72e7dfb4c is the first bad commit
commit 42571aefafb1d330ef84eb29418832f72e7dfb4c
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Fri Sep 6 23:29:00 2013 +0300

    drm/i915: Add support for pipe_bpp readout

Reproduce steps:
--------------------------------------------
1. plug in VGA
2. boot machine

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