Bug 54739 - [snb rc6] unable to resume from suspend if rc6 is enabled
Summary: [snb rc6] unable to resume from suspend if rc6 is enabled
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: high normal
Assignee: Daniel Vetter
QA Contact: Intel GFX Bugs mailing list
Depends on:
Reported: 2012-09-10 16:36 UTC by Wen-chien Jesse Sung
Modified: 2013-08-09 09:20 UTC (History)
4 users (show)

See Also:
i915 platform:
i915 features:


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Description Wen-chien Jesse Sung 2012-09-10 16:36:51 UTC
Ref: https://launchpad.net/bugs/1008867

Asus ET2012E may fail to resume from suspend if rc6 is enabled. The failure rate is about 1/2, no matter with or without X.Org running. This issue is gone if I append i915.i915_enable_rc6=0 to kernel parameter.
Comment 1 Jesse Barnes 2012-12-12 18:48:03 UTC
Does this issue still occur with the latest drm-intel-next-queued branch?  What if you apply this patch?
Comment 2 Wen-chien Jesse Sung 2013-01-23 08:41:50 UTC
Yes, it still occurs with the drm-intel-next-queued, no matter w/ or w/o the patch.
Comment 3 Ben Widawsky 2013-04-18 23:02:51 UTC
Since a couple months we've had a bug fix for setting the minimum RC6 voltage on SNB to 450mv. Can you please retest the latest drm-intel-nightly and see if the problem persists?
Comment 4 Wen-chien Jesse Sung 2013-04-22 04:19:52 UTC
Sure, I'll report the result.
Comment 5 Jesse Barnes 2013-04-24 16:48:30 UTC
Random patch to try.

Comment 6 Wen-chien Jesse Sung 2013-05-14 10:51:01 UTC

Tested with latest drm-intel-nightly(fa643cb) and drm-intel-nightly plus the patch in #c5 . No luck, system still hangs after resume.
Comment 7 Chris Wilson 2013-06-12 09:31:34 UTC
Can you please try with this patch: https://patchwork.kernel.org/patch/2707341/ as it claims to fix some instability with rc6 on SandyBridge?
Comment 8 Wen-chien Jesse Sung 2013-06-25 06:52:34 UTC

Tested with the patch, it doesn't help.
Comment 9 Daniel Vetter 2013-08-09 09:20:20 UTC
Hopefully fixed with

commit 7dcd2677ea912573d9ed4bcd629b0023b2d11505
Author: Konstantin Khlebnikov <khlebnikov@openvz.org>
Date:   Wed Jul 17 10:22:58 2013 +0400

    drm/i915: fix long-standing SNB regression in power consumption after resume v2

Please reopen if it's still broken with this patch.

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