Hello, I've got a new laptop and see a strange behaviour when disconnecting and reconnecting my USB-C screen. Here are the steps that I am doing. I have a dual screen setup with xrandr, with my notebook screen being the primary screen and a second large external screen connected via USB-C to my notebook directly. Now I disconnect the USB-C cable and do not do anything software wise, i.e. my X-Server is still pretending to run on two screens, I can move the screen outside of my notebook screen (into the area where the external screen). Now I reconnect the USB-C cable but the screens stays blank (the the screen it says "No USB Type-C connection from your computer"). The only way to get a signal again is to first use xrandr to only use my notebook screen, and at the exact time udev gets a DRM event, and suddently my external monitor appears within xrandr as connected (I did not touch the cable, I only ran an xrandr command to use only the notebook screen). Right after the DRM event I can run the xrandr command to use both screens, but it is annoying to degrade first to one screen, because all windows are moved around and I do not end up with the same window setup as before.
Using the same screen with the same experiment as described above but with a different notebook the screen is able to pick up the signal again, so it's not purely a problem with the external screen. Any idea what is going on and how I can workaround it? I just want to disconnect the cable and reconnect it without the need to switch any xrandr setup. Thanks for your ideas and help Andreas
