[Bug 90935] New: [BYT-M] connection to x server lost when resuming from S4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90935

            Bug ID: 90935
           Summary: [BYT-M] connection to x server lost when resuming from
                    S4
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          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 116437
  --> https://bugs.freedesktop.org/attachment.cgi?id=116437&action=edit
Kernel configuration

Setup
-----
BAY TRAIL M /Notebook ACER Aspire ES1-512
Hardware
Platform: Aspire ES1-512 (ACER) - Notebook
Processor Family : ATOM
CPU Type: Intel(R) Celeron(R) CPU N2840 @ 2.16GHz
Signature : Type , Family: 6, Model: 55, stepping: 8
(SoC : VLV2 C0)
Software
Linux distribution: Ubuntu 14.04 LTS 64 bits ( Window 8.1 dual Boot)
Kernel: 4.1.0-rc4 drm-intel-testing-2015-05-22
BIOS : v1.09 
Mesa: mesa-10.6.0-rc3
Xf86_video_intel: 2.99.917
Libdrm: libdrm-2.4.60
Cairo: 1.14.2
Xserver: xorg-server-1.17.1

Reproduce steps:
----------------
1. Boot in text mode
2. Login as user (not root) and execute command: sudo startx
3. Launch Terminal with Ctrl  + Alt + T
4. Suspend to DISK with command: echo disk > /sys/power/state
6. Wait a moment and resume with keyboard
7. Wait a moment

Actual result:
---------------
7. Image is restored. Terminal is displayed without new prompt.
After several seconds we go back to 1st virtual terminal.
Message indicates that connection to x server is lost

Expected result:
----------------
7. DUT successfully resume from S4

Info:
------
Tested for the first time on Notebook ACER Aspire ES1-512

Similar to https://bugs.freedesktop.org/show_bug.cgi?id=90468

Also reproduced with following steps:
1. Boot in text mode with HDMI screen connected
2. Login as user (not root) and execute command: sudo startx
3. Launch Terminal with Ctrl  + Alt + T
4. Execute command: xrandr --output HDMI1 --rotation left
4. Unplug-plug HDMI cable
5. Suspend to RAM with command: echo mem > /sys/power/state
6. Resume with keyboard
7. Unplug-plug HDMI cable
8. Execute command: xrandr --output HDMI1 --rotation right
9. Unplug-plug HDMI cable
10. Suspend to RAM with command: echo mem > /sys/power/state

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