[Bug 82593] New: [BYT]udevadm unable to monitor HDMI plug/unplug event sporadically
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Wed Aug 13 20:10:23 PDT 2014
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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