Hello,
this is the output of turning off and on my display (using power button):
[mk@linux ~]$ udevadm monitor
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent
KERNEL[79.909185] change
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0 (drm)
KERNEL[79.909318] remove
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/i2c-3/i2c-dev/i2c-3 (i2c-dev)
KERNEL[79.909385] remove
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/i2c-3 (i2c)
KERNEL[79.909564] remove
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0/card0-DP-2/drm_dp_aux1
(drm_dp_aux_dev)
KERNEL[79.909599] remove
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0/card0-DP-2 (drm)
KERNEL[79.909733] remove
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0/card0-DP-3/drm_dp_aux2
(drm_dp_aux_dev)
KERNEL[79.909756] remove
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0/card0-DP-3 (drm)
KERNEL[79.909882] change
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0 (drm)
UDEV [79.912218] remove
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/i2c-3/i2c-dev/i2c-3 (i2c-dev)
UDEV [79.912301] change
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0 (drm)
UDEV [79.912708] remove
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/i2c-3 (i2c)
UDEV [79.913400] remove
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0/card0-DP-2/drm_dp_aux1
(drm_dp_aux_dev)
UDEV [79.913832] remove
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0/card0-DP-3/drm_dp_aux2
(drm_dp_aux_dev)
UDEV [79.913875] remove
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0/card0-DP-2 (drm)
UDEV [79.914230] remove
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0/card0-DP-3 (drm)
UDEV [79.914814] change
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0 (drm)
KERNEL[85.337964] add
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/i2c-3/i2c-dev/i2c-3 (i2c-dev)
KERNEL[85.337996] add
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/i2c-3 (i2c)
UDEV [85.340976] add
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/i2c-3/i2c-dev/i2c-3 (i2c-dev)
UDEV [85.342384] add
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/i2c-3 (i2c)
KERNEL[85.482056] add
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0/card0-DP-3 (drm)
KERNEL[85.482116] add
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0/card0-DP-3/drm_dp_aux1
(drm_dp_aux_dev)
KERNEL[85.482215] change
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0 (drm)
KERNEL[85.482231] add
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0/card0-DP-4 (drm)
KERNEL[85.482308] add
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0/card0-DP-4/drm_dp_aux2
(drm_dp_aux_dev)
KERNEL[85.482386] change
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0 (drm)
KERNEL[85.482415] change
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0 (drm)
UDEV [85.483698] add
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0/card0-DP-3 (drm)
UDEV [85.485053] add
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0/card0-DP-3/drm_dp_aux1
(drm_dp_aux_dev)
UDEV [85.486553] change
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0 (drm)
UDEV [85.487973] add
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0/card0-DP-4 (drm)
UDEV [85.489186] add
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0/card0-DP-4/drm_dp_aux2
(drm_dp_aux_dev)
UDEV [85.490094] change
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0 (drm)
UDEV [85.491090] change
/devices/pci0000:00/0000:00:08.1/0000:08:00.0/drm/card0 (drm)
The monitor was visible in xrandr as DP-2, after power off and on it's
visible as DP-3 (DP-2 is still there "disconnected").
It's troublesome for:
- GUI display configurators
- scripting
- for Xorg configuration which stops to work:
Section "Monitor"
Identifier "DP-2"
Option "Primary" "true"
EndSection
Is this a bug or a feature?
--
Pozdrawiam / Greetings
Marcin Kocur █
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