[Bug 65700] New: [SNB]<3>[drm:ironlake_disable_pch_transcoder] *ERROR* failed to disable transcoder 0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65700

          Priority: medium
            Bug ID: 65700
                CC: xunx.fang at intel.com, yangweix.shui at intel.com
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [SNB]<3>[drm:ironlake_disable_pch_transcoder] *ERROR*
                    failed to disable transcoder 0
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 80758
  --> https://bugs.freedesktop.org/attachment.cgi?id=80758&action=edit
dmesg

System Environment:
--------------------------
Platform: Sandybridge
Kernel:   drm-intel-fixes 76c4259a3ad6af9f4d63b5d3bcc8088844c0c59c

Bug detailed description:
-------------------------
It happens on sandybridge with -driq kernel and -fixes kernel.

I can't catch a good commit.

CPU:Intel(R) Core(TM) i5-2400S CPU @ 2.50GHz.

Boot system, run dmesg -r | egrep "<[1-4]>" |grep drm.
<4>[    1.179153] WARNING: at drivers/gpu/drm/i915/intel_display.c:979
ironlake_crtc_disable+0xbe/0x79b [i915]()
<4>[    1.179157] Modules linked in: i915(+) video button drm_kms_helper drm
mperf freq_table
<4>[    1.179159] CPU: 1 PID: 1227 Comm: udevd Not tainted
3.10.0-rc5_drm-intel-fixes_76c425_20130613_+ #3879
<4>[    1.179231]  [<ffffffffa0013cc9>] ?
drm_mode_set_config_internal+0x19/0x40 [drm]
<4>[    1.179234]  [<ffffffffa004ab8a>] ? drm_fb_helper_set_par+0x54/0x9a
[drm_kms_helper]
<4>[    1.179235]  [<ffffffffa004ab36>] ?
drm_fb_helper_initial_config+0x459/0x459 [drm_kms_helper]
<4>[    1.179254]  [<ffffffffa004aa87>] ?
drm_fb_helper_initial_config+0x3aa/0x459 [drm_kms_helper]
<4>[    1.179258]  [<ffffffffa0012532>] ? drm_mode_config_reset+0xad/0xcc [drm]
<4>[    1.179279]  [<ffffffffa000e37d>] ? drm_get_minor+0x1b5/0x20a [drm]
<4>[    1.179284]  [<ffffffffa000fd2d>] ? drm_get_pci_dev+0x14d/0x254 [drm]
<3>[    1.231224] [drm:ironlake_disable_pch_transcoder] *ERROR* failed to
disable transcoder 0

Reproduce steps:
----------------
1. boot system
2. dmesg -r | egrep "<[1-4]>" |grep drm

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