[Bug 66294] New: [HSW mobile] eDP fails to be re-enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66294

          Priority: medium
            Bug ID: 66294
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW mobile] eDP fails to be re-enabled
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: yangweix.shui at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 81600
  --> https://bugs.freedesktop.org/attachment.cgi?id=81600&action=edit
dmesg: eDP failed to be re enabled

Environment:
----------------
Kernel: (drm-intel-next-queued)6dd8224ec64c809dad5ceceac299918f5d9c7c31

MSI Haswell Notebook MSI MS-16GC Notebook 15.6;
Host bridge ID=0x0c04 (rev 06);
VGA ID=0x0416 (rev06); 
BIOS: E16GCIMS.509 (04/24/2013)

Description:
----------------
Unable to wake up eDP monitor using display switching option. While trying to
wake up the monitor monitor stays in OFF state. HSW desktop's all pipe work
well, ULT eDP + micro HDMI works well, our new ULT platform only support these
two pipes. Another ULT which has more pipe is used by others, I will test it
ASAP when it's free.

Reproduce steps:
----------------
1.Prepare DUT under above configuration.
2.Connect another monitor(VGA or HDMI).
3.Boot DUT and enter the following command:
#xrandr --output eDP1 -- off
#xrandr --autoreboot

Current result:
----------------
#xrandr --output eDP1 -- off
eDP turns OFF
#xrandr --auto
eDP remains in the OFF state


Expected result:
----------------
eDP must awake when entering the command # xrandr --auto

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