Bug 82831 - gm45 render ring initialization error regression
Summary: gm45 render ring initialization error regression
Status: RESOLVED DUPLICATE of bug 82481
Alias: None
Product: Drivers
Classification: Unclassified
Component: Video(DRI - Intel) (show other bugs)
Hardware: x86-64 Linux
: P2 normal
Assignee: Chris Wilson
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2014-08-20 08:36 UTC by Riccardo Magliocchetti
Modified: 2014-08-22 12:47 UTC (History)
2 users (show)

See Also:
Kernel Version: 3.16.1
Subsystem:
Regression: Yes
Bisected commit-id:

Attachments
dmesg with 3.14.16 (56.09 KB, application/octet-stream)
2014-08-20 08:36 UTC, Riccardo Magliocchetti 		Details
3.16.1 dmesg (54.85 KB, application/octet-stream)
2014-08-20 08:36 UTC, Riccardo Magliocchetti 		Details
Add an attachment (proposed patch, testcase, etc.)

Description Riccardo Magliocchetti 2014-08-20 08:36:20 UTC 
Created attachment 147501 [details]
dmesg with 3.14.16

Since 3.16.1 am getting this in dmesg and everything gl / video related looks cpu bound.

[   16.660061] [drm:init_ring_common] *ERROR* render ring initialization failed ctl 0001f001 (valid? 1) head 000020a0 tail 00000000 start 00193000 [expected 00193000]
[   16.660075] [drm:i915_gem_init] *ERROR* Failed to initialize GPU, declaring it wedged

Up to 3.14.16 it works fine but i haven't checked 3.15
Comment 1 Riccardo Magliocchetti 2014-08-20 08:36:41 UTC 
Created attachment 147511 [details]
3.16.1 dmesg
Comment 2 Jani Nikula 2014-08-22 12:47:41 UTC 
commit ece4a17d237a79f63fbfaf3f724a12b6d500555c
Author: Jiri Kosina <jkosina@suse.cz>
Date:   Thu Aug 7 16:29:53 2014 +0200

    drm/i915: read HEAD register back in init_ring_common() to enforce ordering

is duct tape making this occur less often, and there's a bug at fdo for trying to identify the root cause: https://bugs.freedesktop.org/show_bug.cgi?id=76554

*** This bug has been marked as a duplicate of bug 82481 ***
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