[Bug 216376] AMDGPU: display output disables and quickly reenables when switching AVR into/from standby doing HDMI passthrough

[bugzilla-daemon at kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216376

--- Comment #4 from Jure Repinc (jlp.bugs at gmail.com) ---
If I got it right, the hotplug events are all posted via udev? If so, is it
correct to use "udevadm monitor --environment --udev" to see these events
posted to userspace? Or is there somethign better? Just trying to make the best
sense out of it to try making a workaround and gather as much relevant
information to report a good bug/feature request with correct info to KDE
developers.


If I use "udevadm monitor --environment --udev" I get the output:

udevadm monitor --environment --udev
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing


< switching AVR from on to standby mode >


UDEV  [35121.304457] change  
/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0 (drm)
ACTION=change
DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0
SUBSYSTEM=drm
HOTPLUG=1
CONNECTOR=74
DEVNAME=/dev/dri/card0
DEVTYPE=drm_minor
SEQNUM=12043
USEC_INITIALIZED=4651406
ID_PATH=pci-0000:01:00.0
ID_PATH_TAG=pci-0000_01_00_0
ID_FOR_SEAT=drm-pci-0000_01_00_0
MAJOR=226
MINOR=0
DEVLINKS=/dev/dri/by-path/pci-0000:01:00.0-card
TAGS=:uaccess:master-of-seat:seat:
CURRENT_TAGS=:uaccess:master-of-seat:seat:

UDEV  [35124.216717] change  
/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0 (drm)
ACTION=change
DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0
SUBSYSTEM=drm
HOTPLUG=1
CONNECTOR=74
DEVNAME=/dev/dri/card0
DEVTYPE=drm_minor
SEQNUM=12044
USEC_INITIALIZED=4651406
ID_PATH=pci-0000:01:00.0
ID_PATH_TAG=pci-0000_01_00_0
ID_FOR_SEAT=drm-pci-0000_01_00_0
MAJOR=226
MINOR=0
DEVLINKS=/dev/dri/by-path/pci-0000:01:00.0-card
TAGS=:uaccess:master-of-seat:seat:
CURRENT_TAGS=:uaccess:master-of-seat:seat:


< switching AVR from standby to on mode >


UDEV  [35155.373681] change  
/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0 (drm)
ACTION=change
DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0
SUBSYSTEM=drm
HOTPLUG=1
CONNECTOR=74
DEVNAME=/dev/dri/card0
DEVTYPE=drm_minor
SEQNUM=12048
USEC_INITIALIZED=4651406
ID_PATH=pci-0000:01:00.0
ID_PATH_TAG=pci-0000_01_00_0
ID_FOR_SEAT=drm-pci-0000_01_00_0
MAJOR=226
MINOR=0
DEVLINKS=/dev/dri/by-path/pci-0000:01:00.0-card
TAGS=:uaccess:master-of-seat:seat:
CURRENT_TAGS=:uaccess:master-of-seat:seat:

UDEV  [35158.196252] change  
/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0 (drm)
ACTION=change
DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0
SUBSYSTEM=drm
HOTPLUG=1
CONNECTOR=74
DEVNAME=/dev/dri/card0
DEVTYPE=drm_minor
SEQNUM=12049
USEC_INITIALIZED=4651406
ID_PATH=pci-0000:01:00.0
ID_PATH_TAG=pci-0000_01_00_0
ID_FOR_SEAT=drm-pci-0000_01_00_0
MAJOR=226
MINOR=0
DEVLINKS=/dev/dri/by-path/pci-0000:01:00.0-card
TAGS=:uaccess:master-of-seat:seat:
CURRENT_TAGS=:uaccess:master-of-seat:seat:

UDEV  [35158.953569] change  
/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0 (drm)
ACTION=change
DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0
SUBSYSTEM=drm
HOTPLUG=1
CONNECTOR=74
DEVNAME=/dev/dri/card0
DEVTYPE=drm_minor
SEQNUM=12050
USEC_INITIALIZED=4651406
ID_PATH=pci-0000:01:00.0
ID_PATH_TAG=pci-0000_01_00_0
ID_FOR_SEAT=drm-pci-0000_01_00_0
MAJOR=226
MINOR=0
DEVLINKS=/dev/dri/by-path/pci-0000:01:00.0-card
TAGS=:uaccess:master-of-seat:seat:
CURRENT_TAGS=:uaccess:master-of-seat:seat:

UDEV  [35161.036327] change  
/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0 (drm)
ACTION=change
DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0
SUBSYSTEM=drm
HOTPLUG=1
CONNECTOR=74
DEVNAME=/dev/dri/card0
DEVTYPE=drm_minor
SEQNUM=12051
USEC_INITIALIZED=4651406
ID_PATH=pci-0000:01:00.0
ID_PATH_TAG=pci-0000_01_00_0
ID_FOR_SEAT=drm-pci-0000_01_00_0
MAJOR=226
MINOR=0
DEVLINKS=/dev/dri/by-path/pci-0000:01:00.0-card
TAGS=:uaccess:master-of-seat:seat:
CURRENT_TAGS=:uaccess:master-of-seat:seat:

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