[Bug 62251] New: Persistent "WARNING: at drivers/gpu/drm/i915/intel_display.c:979 intel_wait_for_pipe_off+0xfc/0x1c0 [i915]() pipe_off wait timed out" traces at each boot

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=62251

            Bug ID: 62251
           Summary: Persistent "WARNING: at
                    drivers/gpu/drm/i915/intel_display.c:979
                    intel_wait_for_pipe_off+0xfc/0x1c0 [i915]() pipe_off
                    wait timed out" traces at each boot
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.10.12
          Hardware: All
                OS: Linux
              Tree: Fedora
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: awilliam at redhat.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 109831
  --> https://bugzilla.kernel.org/attachment.cgi?id=109831&action=edit
the oldest instance of the tb I have (in abrt format)

I'm running Fedora 18 on a 2010 model Sony Vaio Z, model VPCZ112GD, graphics
adapter is a:

00:02.0 VGA compatible controller [0300]: Intel Corporation Core Processor
Integrated Graphics Controller [8086:0046] (rev 02)

[    58.460] (--) intel(0): Integrated Graphics Chipset: Intel(R) Arrandale

The system also has an NVIDIA adapter - it slightly predates Optimus, it uses
some kind of Sony-proprietary Optimus precursor, I think, but I have it
firmware hacked to enable only the Intel adapter. The NVIDIA one does not show
up at all in lspci or X log, so I don't think it's interfering.

Ever since kernel 3.8.9-200.fc18.x86_64 , I've been consistently getting a
traceback like this once or twice per boot:

WARNING: at drivers/gpu/drm/i915/intel_display.c:1028
intel_wait_for_pipe_off+0xea/0x1b0 [i915]()
Hardware name: VPCZ112GD
pipe_off wait timed out

I'll attach the oldest and newest ones I have, for reference. They look pretty
similar, looks like only line numbers change, really. This has persisted all
the way up to the current F18 kernel, 3.10.12-100.fc18.x86_64 . I am about to
bump the system to F20, so I'll be able to see if it's still happening with
3.11 and 3.12 soon.

Other reports of this often seem related to external displays, but I have no
external display hooked up to the system at any point. I'm only using the
internal display. By the timing, I think the traces occur during system boot
and possibly shutdown.

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