Monitors not being recognized after boot

[Thrillseeker]

After trying out some of the commands in this thread:

Display Manager multi-monitor configuration

When having multple monitors on system boot, your Display Manager (SDDM, LightDM, GDM etc) will usually not display correctly in respect to your configured Xorg settings, if not configured properly. To fix this, a popular and fairly proper and easy method is to use an Xsetup script for your Display Manager. Xsetup script is a script (executable) file that includes some instructions to the Xorg server, just before starting the Display Manager Here arre these settings for SDDM, while they can…

I ran this in Konsole:
╭─thrillseeker@RYZEN7 in ~ took 1s
╰─λ xrandr | awk ’ /connected/ { print $1, $2 }’
HDMI-A-0 connected
DisplayPort-0 connected

I did notice that the command only recognizes if the computers outputs is connected, not if the other end of the cable is connected.

I suddenly got both monitors working again, but with the display cables switched between the monitors. So I still use the DisplayPort cable for my main monitor as of today and a HDMI cable for the Samsung monitor as of today. I also noted some flickering just after my new attempt, so I tried a third HDMI cable that is 10m long and also in another HDMI port on the Samsung monitor (note that I did try diffrent HDMI ports earlier when troubleshooting but still didn’t get it working at the time). So the problem with flickering seems to be gone.

I still need to check if the main problem is still there from waking the computer up from sleep or from boot.