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.
Does this issue still occur with the latest drm-intel-next-queued branch? What if you apply this patch?
Yes, it still occurs with the drm-intel-next-queued, no matter w/ or w/o the patch.
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?
Sure, I'll report the result.
Random patch to try.
Tested with latest drm-intel-nightly(fa643cb) and drm-intel-nightly plus the patch in #c5 . No luck, system still hangs after resume.
Can you please try with this patch: https://patchwork.kernel.org/patch/2707341/ as it claims to fix some instability with rc6 on SandyBridge?
Tested with the patch, it doesn't help.
Hopefully fixed with
Author: Konstantin Khlebnikov <firstname.lastname@example.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.
on Jul 30, 2016 at 16:49:56.
(provided by the Example extension).