[Bug 82340] New: [HSW Regression] Fail to resume from S4, causing system hang (once out of 5 test circles)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82340

          Priority: medium
            Bug ID: 82340
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW Regression] Fail to resume from S4, causing
                    system hang (once out of 5 test circles)
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: ming.yao at intel.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

==System Environment==
--------------------------
Regression: Yes.
Good commit: commit e1255d4cde1881345b2f68a39a96a995607b70e9
             Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
             Date:   Sat Jun 28 02:04:03 2014 +0300

             drm/i915: Clarify CHV swing margin/deemph bits


Non-working platforms: HSW

==kernel==
--------------------------
-nightly:  (test fails)
    commit c3b4c0436dffd0a2d25d9583bd6c3e64f5090603
    Author:     Daniel Vetter <daniel.vetter at ffwll.ch>
    AuthorDate: Thu Aug 7 16:50:48 2014 +0200
    Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
    CommitDate: Thu Aug 7 16:50:48 2014 +0200

    drm-intel-nightly: 2014y-08m-07d-16h-50m-27s integration manifest

-queued:  (test fails in the same way)
    commit 9de1683a0fa8ce9dc569bafd04f7487c8b9080ac
    Author:     Gajanan Bhat <gajanan.bhat at intel.com>
    AuthorDate: Thu Aug 7 17:03:30 2014 +0530
    Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
    CommitDate: Thu Aug 7 15:01:53 2014 +0200

    drm/i915: Add sprite watermark programming for VLV and CHV

-fixes:  (test fails in the same way)
    commit 7badbebb052ab30806289a4d4d35f35a7c4240d1
    Author:     Jiri Kosina <jkosina at suse.cz>
    AuthorDate: Thu Aug 7 16:29:53 2014 +0200
    Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
    CommitDate: Thu Aug 7 16:49:57 2014 +0200

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



==Bug detailed description==
-----------------------------
System fails to resume from S4. Dmesg from netconsole is attached.

But if rmmoded i915, S4 works well for at least 20 times


==Reproduce steps==
----------------------------
for ((i=0; i<20; i++))
do
  echo 0 > /sys/class/rtc/rtc0/wakealarm
  echo +15 > /sys/class/rtc/rtc0/wakealarm
  echo disk > /sys/power/state
done

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