Bug 60541 - 'Timed out waiting for forcewake old ack to clear' and hangup on IvyBridge system
Summary: 'Timed out waiting for forcewake old ack to clear' and hangup on IvyBridge sy...
Alias: None
Product: Drivers
Classification: Unclassified
Component: Video(DRI - Intel) (show other bugs)
Hardware: x86-64 Linux
: P1 normal
Assignee: intel-gfx-bugs@lists.freedesktop.org
Depends on:
Reported: 2013-07-09 22:48 UTC by Guenter Roeck
Modified: 2019-05-10 13:10 UTC (History)
3 users (show)

See Also:
Kernel Version: 3.8+
Tree: Mainline
Regression: No


Description Guenter Roeck 2013-07-09 22:48:06 UTC
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.
Comment 1 Daniel Vetter 2013-07-10 06:05:14 UTC
Partial revert merged to -fixes, with cc: stable added.

commit c11e5f35ab490bd30591563816fbc83526521777
Author: Guenter Roeck <linux@roeck-us.net>
Date:   Tue Jul 9 16:00:31 2013 -0700

    Partially revert "drm/i915: unconditionally use mt forcewake on hsw/ivb"
Comment 2 kev levrone 2019-05-10 10:21:46 UTC
The new kernel does not fix the bug. I and a few on the Ubuntu tracker have found that it still exhibits the same occasional, seemingly random issues with the infinite loop. https://goo.gl/KyvnZF
Comment 3 Guenter Roeck 2019-05-10 13:10:49 UTC
The link in comment 2 pooints to a research paper writing service, making me wonder if the post is clickbait / spam.

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