[Bug 95166] New: [KBL] Suspend to disk does work after several iterations

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95166

            Bug ID: 95166
           Summary: [KBL] Suspend to disk does work after several
                    iterations
           Product: DRI
           Version: unspecified
          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: christophe.prigent at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 123299
  --> https://bugs.freedesktop.org/attachment.cgi?id=123299&action=edit
kern.log

Hardware
Platform: KABY LAKE-U
CPU : Intel(R) Core(TM) @ 2.60GHz
MCP : KBL-U G0 2+2 (ou ULT-G0)
QDF : QYQ8
Chipset PCH: SPT-LP C1
CRB : KABY LAKE U DDR3L RVP7 CRB FAB1

Software
BIOS : KBLSE2R1.R00.X015.B01.1511271314
ME FW : 11.5.0.1008
Ksc (EC FW): 1.20
Linux distribution: Ubuntu 15.10 64 bits
Kernel: drm-intel-nightly 4.6.0-rc4 from http://cgit.freedesktop.org/drm-intel/
  with applied:
https://lists.freedesktop.org/archives/intel-gfx/2016-April/094135.html
libdrm 2.4.67-25 cc9a53f from git://git.freedesktop.org/git/mesa/drm
mesa 11.1.2 7bcd827 from git://git.freedesktop.org/git/mesa/mesa
cairo 1.15.2 db8a7f1 from git://git.freedesktop.org/git/cairo
xorg/xserver 1.18.0-274 8437955 from git://git.freedesktop.org/git/xorg/xserver
xf86-video-intel 2.99.917-634 81029be from
git://git.freedesktop.org/git/xorg/driver/xf86-video-intel
vaapi/libva 1.7.0-1 2339d10 from git://git.freedesktop.org/git/vaapi/libva
vaapi/intel-driver 1.7.0-8 2c1bec0 from
git://git.freedesktop.org/git/vaapi/intel-driver
DMC 1.01 from https://01.org/linuxgraphics/downloads/kabylake-dmc-1.01

Pre-conditions
--------------
Disconnect external screens
Unplug unnecessary PCI cards like ethernet card ...
Boot in text mode (execute command: systemctl set-default multi-user.target and
reboot)
Disconnect USB mouse

Steps:
------
1. Suspend to disk and resume with:
sudo -s
echo disk > /sys/power/state
Wait 60 seconds
Resume with keyboard
2. Wait 30 seconds
3. Repeat steps 2 and 3 100 times

Actual result:
--------------
3. DUT does not respond after between 8 and 12 iterations (black screen,
keyboard not responding, ssh not responding, need to unplug charger)

Expected result:
----------------
3. System can suspend to DISK and resume 100 times

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