[Bug 93016] New: [SKL-Y] VGA PCI controler does not suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93016

            Bug ID: 93016
           Summary: [SKL-Y] VGA PCI controler does not suspend
           Product: DRI
           Version: unspecified
          Hardware: x86 (IA32)
                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 119941
  --> https://bugs.freedesktop.org/attachment.cgi?id=119941&action=edit
4.4-rc1-nightly_text-mode_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. Make audio codec enters D3 hot, with command:
echo 5 > /sys/module/snd_hda_intel/parameters/power_save
3. Enable autosuspend for the audio device, with command:
echo auto > /sys/bus/pci/devices/0000:00:1f.3/power/control
4. Allow the device driver to power manage the VGA compatible controller at run
time with command:
echo auto > /sys/bus/pci/devices/0000:00:02.0/power/control
5. Check status and suspended time with command:
grep . /sys/bus/pci/devices/0000:00:02.0/power/runtime_*

6. From Ubuntu Power settings, configure Turn screen off when inactive after 1
minute
7. Auto-tune the system using PowerTop, execute command:
sudo powertop --auto-tune
8. Wait 3 minutes
9. Check status and suspended time with command:
grep . /sys/bus/pci/devices/0000:00:02.0/power/runtime_*

10. Turn off monitor with: xrandr --output eDP1 --off
11. Wait a moment
12. Turn it on with xrandr --output eDP1 --on (connected via ssh)
13. Check suspended time with command:
grep . /sys/bus/pci/devices/0000:00:02.0/power/runtime_*

14. With previous conditions, turn off networks, disconnect devices (mouse,
keyboard ...), close applications (Terminal)
15. Wait 2 hours (screen automatically turns off)
16. Check suspended time with command:
grep . /sys/bus/pci/devices/0000:00:02.0/power/runtime_*

Actual result:
--------------
VGA PCI controller does not suspend

Expected result:
----------------
Status indicates "suspended" and the counter increases

Info:
-----
Reproduced in txt mode
Reproduced with kernel mainline 4.4-rc1 from
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/?id=refs/tags/v4.4-rc1
Not reproduced with kernel mainline 4.3, the controller suspends at step 4

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