[Bug 93915] New: [BXT-P/ APL] xrandr shows DP panel as disconnect after resume from S3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93915

            Bug ID: 93915
           Summary: [BXT-P/ APL] xrandr shows DP panel as disconnect after
                    resume from S3
           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: humberto.i.perez.rodriguez at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 121373
  --> https://bugs.freedesktop.org/attachment.cgi?id=121373&action=edit
dmesg.log

System environment
---------------------------
Panel used as 4K : Asus 28" LED-Lit 4K monitor-PB287Q
BXT-P : CPU QDF QKG2
KSC : 1.06
BIOS : APLK_IFWI_X64_R_2016_02_4_00 (119.10)
Cores : 4
Microcode Revision : 9002100A
Processor : Intel (R) Genuinen processor
Speed : 1200 Mhz
BXT SOC : A0
GOP : 10.0.1022
CPU Flavor : APL RVP 1A (01)
FAB ID : FAB1
BOAD ID : APL RVP 1A (01)
Total Memory : 8GB


Software configuration
-----------------------------
OS : Ubuntu 15.10 x86_64
kernel : drm-intel-nightly

commit 8fe9e785ae04fa7c37f7935cff12d62e38054b60
Author: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Date:   Thu Jan 21 11:03:06 2016 +0000
drm-intel-nightly: 2016y-01m-21d-11h-02m-42s UTC integration manifest

--> Component : drm 
url : http://cgit.freedesktop.org/mesa/drm 
tag : libdrm-2.4.66-2-ge342c0f 
commit : e342c0f 
author : Ville Syrjälä <ville.syrjala at linux.intel.com> 
age : 6 weeks ago 
--> Component : mesa 
url : http://cgit.freedesktop.org/mesa/mesa 
tag : mesa-11.0.8 
commit : 261daab 
author : Emil Velikov <emil.velikov at collabora.com> 
age : 5 weeks ago 
--> Component : xf86-video-intel 
url : http://cgit.freedesktop.org/xorg/driver/xf86-video-intel 
tag : 2.99.917 
commit : baec802 
author : Chris Wilson <chris at chris-wilson.co.uk> 
age : 1 year 1 month ago 
--> Component : libva 
url : http://cgit.freedesktop.org/libva/ 
tag : libva-1.6.1-34-gcb418f6 
commit : cb418f6 
author : Lim Siew Hoon <siew.hoon.lim at intel.com> 
age : 3 weeks ago 
--> Component : vaapi (intel-driver) 
url : http://cgit.freedesktop.org/vaapi/intel-driver 
tag : 1.6.1-88-g2110b3a 
commit : 2110b3a 
author : peng.chen <peng.c.chen at intel.com> 
age : 13 days ago 
--> Component : cairo 
url : http://cgit.freedesktop.org/cairo 
tag : 1.15.2 
commit : db8a7f1 
author : Bryce Harrington <bryce at osg.samsung.com> 
age : 7 weeks ago 
--> Component : xserver 
url : http://cgit.freedesktop.org/xorg/xserver 
tag : xorg-server-1.18.0 
commit : 43fb888 
author : Adam Jackson <ajax at redhat.com> 
age : 3 months ago

Regresion
--------------
not sure

Bug detailed description
-------------------------------
After resume from S3 state with DP connected, xrandr shows DP as disconnected
instead connected and the image on DP disappears

Steps to reproduce
-------------------------
1-Connect DP panel to BXT-P system and type xrandr to see how it recognizes DP
panel
2-Go to S3 state with the command :
# echo mem > /sys/power/state
3-Wait for 30 seconds
4-Resume from S3 state by keyboard or power bottom
5-type xrandr

The failure is seen in step 5

Expected result
--------------------
After resume from S3 DP panel will shows in xrandr and the image as well

Actual results
-----------------
After resume from S3 state with DP connected, xrandr shows DP as disconnected
instead connected and the image on DP disappears


Additional info
------------------
grub options :

acpi_enforce_resources=lax initcall_debug maxcpus=1 no_console_suspend
log_buf_len=4M ignore_loglevel i915.enable_rc6=0 drm.debug=0x1e

Bios options :

1- Device Manager > System Setup > CPU Configuration > CPU Power Management >
Max Package C State "S0ix default" to "C0"
2- Device Manager > System Setup > CPU Configuration > CPU Power Management >
Max Core C State "Fused value default" to "Core C6"

Attachment
---------------
dmesg.log
xrandr.log

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