[Bug 95149] New: [KBL] Error DC state mismatch when suspending to disk

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95149

            Bug ID: 95149
           Summary: [KBL] Error DC state mismatch when suspending to disk
           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 123276
  --> https://bugs.freedesktop.org/attachment.cgi?id=123276&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://patchwork.freedesktop.org/series/6022/
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 1.23 from https://01.org/linuxgraphics/downloads/skylake-dmc-1.26

Steps:
------
1. Suspend to disk and resume:
sudo -s
echo disk > /sys/power/state
Wait 60 seconds
Resume with keyboard
2. Check logs

Actual result:
--------------
2. Log contains:
[   93.657098] [drm:gen9_set_dc_state [i915]] *ERROR* DC state mismatch (0x0 ->
0x2)

Expected result:
----------------
2. No such error

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