How can I get stable video output names?

- System: Dell Latitude 5591 - CPU i7-8850H - GPU: integrated Intel HD630 (no dedicated GPU) - USB-C Dock: WD15 - Screens: 2x Acer G226HQL (connected via HDMI directly and DVI-to-miniDP-Adapter to dock) - OS: KDE neon 18.4 - Kernel: 5.3.0-45-generic Every time I replug the dock, the screens stay black. I have to open xrandr (arandr, KDE Display Configuration, whatever) to reenable the triple screen layout. I suspect that this is caused by the port names not being stable: Everything configured:

grep . /sys/class/drm/*/status
/sys/class/drm/card0-DP-1/status:disconnected
/sys/class/drm/card0-DP-2/status:disconnected
/sys/class/drm/card0-DP-5/status:connected        # <---- 5
/sys/class/drm/card0-DP-7/status:connected        # <---- 7
/sys/class/drm/card0-DP-8/status:disconnected
/sys/class/drm/card0-eDP-1/status:connected
/sys/class/drm/card0-HDMI-A-1/status:disconnected
/sys/class/drm/card0-HDMI-A-2/status:disconnected
/sys/class/drm/card0-HDMI-A-3/status:disconnected

Now, when I unplug and replug the dock:

/sys/class/drm/card0-DP-1/status:disconnected
/sys/class/drm/card0-DP-2/status:disconnected
/sys/class/drm/card0-DP-6/status:connected        # <---- 6
/sys/class/drm/card0-DP-8/status:connected        # <---- 8
/sys/class/drm/card0-DP-9/status:disconnected
/sys/class/drm/card0-eDP-1/status:connected
/sys/class/drm/card0-HDMI-A-1/status:disconnected
/sys/class/drm/card0-HDMI-A-2/status:disconnected
/sys/class/drm/card0-HDMI-A-3/status:disconnected

DP-5 and DP-7 are now known as DP-6 and DP-8. The numbers are altered every time. How to prevent this? **Edit 1:** Noticed a behavior that might be related. I have a temperature widget that monitors the PCH temperature. After every reboot it changes it's name as well. The number in acpi/Thermal_Zone/1-pch_cannonlake/Temperature is altered almost on every reboot. Have to reconfigure the monitor quite frequently. **Edit 2:** Found a thread on the arch forum that described a very similar problem. Solution in their case was a downgrade to kernel 4.18. I am currently running 4.18.0-25-generic and it seems to solve the issue. **Edit 2a:** Now with 4.18.0-25-generic I noticed a difference. The output of grep . /sys/class/drm/*/status stays the same, the numbers are still altered on every reconnect

grep . /sys/class/drm/*/status
/sys/class/drm/card0-DP-1/status:disconnected
/sys/class/drm/card0-DP-2/status:disconnected
/sys/class/drm/card0-DP-5/status:connected        # <--- DP-5!
/sys/class/drm/card0-DP-6/status:connected        # <--- DP-6!
/sys/class/drm/card0-DP-7/status:disconnected
/sys/class/drm/card0-eDP-1/status:connected
/sys/class/drm/card0-HDMI-A-1/status:disconnected
/sys/class/drm/card0-HDMI-A-2/status:disconnected
/sys/class/drm/card0-HDMI-A-3/status:disconnected

but xrandr somehow "sees" stable numbers like DP-1-1 and DP-1-2:

xrandr -q | grep connected
eDP-1 connected 1920x1080+3839+0 (normal left inverted right x axis y axis) 344mm x 194mm
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-3 disconnected (normal left inverted right x axis y axis)
DP-1-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 509mm x 286mm
DP-1-2 connected primary 1920x1080+1919+0 (normal left inverted right x axis y axis) 509mm x 286mm
DP-1-3 disconnected (normal left inverted right x axis y axis)

On newer kernels xrandr saw the same numbers as they were enumerated by drm.