[Bug 82593] New: [BYT]udevadm unable to monitor HDMI plug/unplug event sporadically

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82593

          Priority: medium
            Bug ID: 82593
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT]udevadm unable to monitor HDMI plug/unplug event
                    sporadically
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 104597
  --> https://bugs.freedesktop.org/attachment.cgi?id=104597&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure
I didn't find good commit.

Non-working platforms: BYT

==kernel==
--------------------------
origin/drm-intel-nightly: da31e7c60be217316278a055dd3f91c33913270f(fails)
    drm-intel-nightly: 2014y-08m-13d-17h-12m-37s integration manifest
origin/drm-intel-next-queued: 82e3b8c130f046b7dd1e7898c10e40edb52fee6d(fails)
    drm/i915: Localise the fbdev console lock frobbing  
origin/drm-intel-fixes: be71eabebaf9f142612d34d42292b454e984dcb5(fails)
    Revert "drm/i915: Enable semaphores on BDW"

==Bug detailed description==
-----------------------------
udevadm unable to monitor HDMI plug/unplug event sometimes. It works well while
plug/unplug VGA cable.

HDMI monitor is able to display.

Output:
root at x-bytm02:~# udevadm monitor
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent


Sometimes message below will print out after a while. 

KERNEL[429.925536] add      /devices/virtual/bdi/0:27 (bdi)
UDEV  [429.926843] add      /devices/virtual/bdi/0:27 (bdi)
KERNEL[430.636487] remove   /devices/virtual/bdi/0:27 (bdi)
UDEV  [430.636744] remove   /devices/virtual/bdi/0:27 (bdi)
KERNEL[430.893520] add      /devices/virtual/bdi/0:27 (bdi)
UDEV  [430.894314] add      /devices/virtual/bdi/0:27 (bdi)
KERNEL[431.445422] remove   /devices/virtual/bdi/0:27 (bdi)
UDEV  [431.445819] remove   /devices/virtual/bdi/0:27 (bdi)
KERNEL[431.656988] add      /devices/virtual/bdi/0:27 (bdi)
UDEV  [431.657631] add      /devices/virtual/bdi/0:27 (bdi)
KERNEL[432.480439] remove   /devices/virtual/bdi/0:27 (bdi)
UDEV  [432.480766] remove   /devices/virtual/bdi/0:27 (bdi)



Reproduce steps:
-------------------------
1. udevadm monitor
2. plug/unplug HDMI cable.

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