[Bug 85157] New: Onboard & HDMI-connected displays flickering after resuming from suspend to memory

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85157

            Bug ID: 85157
           Summary: Onboard & HDMI-connected displays flickering after
                    resuming from suspend to memory
           Product: DRI
           Version: XOrg CVS
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: lharrington at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 108005
  --> https://bugs.freedesktop.org/attachment.cgi?id=108005&action=edit
contents of /sys/class/drm/card0/error after bug occurred

Whenever I open my laptop, resuming from suspend, if my HDMI connected external
display is powered on, both displays flicker until I restart X. 

I am using the current video drivers available from Intel from their PPA:
  /etc/apt/sources.list.d/intellinuxgraphics.list:
    deb https://download.01.org/gfx/ubuntu/14.04/main trusty main #Intel
Graphics drivers

lsb info:
Distributor ID:    Ubuntu
Description:    Ubuntu 14.04.1 LTS
Release:    14.04
Codename:    trusty

relevant dmesg showing before & after:
[ 2267.549136] Watchdog[4645]: segfault at 0 ip 00007f143b948d98 sp
00007f142bf21710 error 6 in libcontent.so[7f143b113000+1170000]
[ 2278.795343] Watchdog[14362]: segfault at 0 ip 00007f9336bffd98 sp
00007f93271d8710 error 6 in libcontent.so[7f93363ca000+1170000]
[ 4038.327596] [drm] stuck on render ring
[ 4038.328237] [drm] GPU HANG: ecode 0:0xf5f7fffe, in ShCrOpenGL [5127],
reason: Ring hung, action: reset
[ 4038.328239] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[ 4038.328240] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[ 4038.328241] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[ 4038.328242] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[ 4038.328243] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[ 4040.329884] [drm] Enabling RC6 states: RC6 on, RC6p on, RC6pp off
[ 4788.457392] NET: Unregistered protocol family 15
[ 4788.524731] NET: Registered protocol family 15

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