[Bug 93018] New: [SKL-Y] Black screen when resuming from S4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93018

            Bug ID: 93018
           Summary: [SKL-Y] Black screen when resuming from S4
           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 119942
  --> https://bugs.freedesktop.org/attachment.cgi?id=119942&action=edit
4.4-rc1-nightly_screen-off-when-resuming-from-S4_kern.log

Hardware
Platform: SKY LAKE Y A0 QUAL
CPU : Intel(R) Core(TM) M5-6Y54 @ 1.10GHz 4MB (family: 6, model: 78  stepping:
3)
MCP : SKL-Y  D0   
QDF : QJ9W
CPU : SKL D0
Chipset PCH: Sunrise Point LP C0       
CRB : SKY LAKE Y LPDDR3 RVP3 CRB FAB2
Reworks : All Mandatories + FBS02 & FBS03, O-06
Software 
Linux : Ubuntu 14.04 64 bits
BIOS : SKLSE2R1.R00.B104.B01.1511110114
ME FW : 11.0.0.1191
Ksc (EC FW): 1.20
Kernel 4.4.0-rc1 nighlty 2e0db75 from git://anongit.freedesktop.org/drm-intel
  commit 2e0db751f53791a654eaeb829efd2b4125249dfc
  Author: Imre Deak <imre.deak at intel.com>
  Date:   Wed Nov 18 21:49:07 2015 +0200
  drm-intel-nightly: 2015y-11m-18d-19h-48m-48s UTC integration manifest
Mesa 11.0.5 from http://cgit.freedesktop.org/mesa/mesa/
xf86-video-intel - 2.99.917 from
http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/
Libdrm - 2.4.65 from http://cgit.freedesktop.org/mesa/drm/
Libva - 1.6.1 from http://cgit.freedesktop.org/libva/
vaapi intel-driver - 1.6.1 from http://cgit.freedesktop.org/vaapi/intel-driver
Cairo - 1.14.2 from http://cgit.freedesktop.org/cairo
Xorg Xserver - 1.17.2 from http://cgit.freedesktop.org/xorg/xserver

Steps:
------
1. Boot with kernel boot command line: i915.disable_power_well=1
2. Execute commands:
sudo -s
echo disk > /sys/power/state
3. Wait 60 seconds
4. Resume with keyboard

Actual result:
---------------
4. DUT resumes (DUT is responding via ssh) but screen stays off

Expected result:
----------------
4. DUT resumes with screen on

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