[Bug 60541] New: 'Timed out waiting for forcewake old ack to clear' and hangup on IvyBridge system

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=60541

            Bug ID: 60541
           Summary: 'Timed out waiting for forcewake old ack to clear' and
                    hangup on IvyBridge system
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.8+
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: linux at roeck-us.net
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

On Supermicro C7H61, BIOS version 2.00 dated 11/02/2012 or 2.0b dated
03/29/2013, with i7-3770K CPU, the following error message is seen repeatedly:

    Timed out waiting for forcewake old ack to clear

On a heavily loaded system, this can result in a hangup within a few minutes.

Reverting commit 36ec8f877 (drm/i915: unconditionally use mt forcewake on
hsw/ivb) fixes the problem.

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