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USBC-HDMI converter does not work after sleep mode

lr flag

I have a laptop and I got two monitors connected to to it (one HDMI, one over USBC3->HDMI).

My standard setting is, that the build-in laptop screen is disabled. Any I have only two screens in resolution 1920x1080 60hz.

When the computer falls into sleep and I wake him up, then I get everytime a mess. The build-in laptop screen is suddenly enabled, the order is mixed up, from one monitor and the build-in montior the resolution is 1920x1080 60hz, but the 3rd monitor (the one connected by USB3-converter) jumps to a resolution to 1680x1050 30hz and 1920x1080 is not selectable.

With the hack of https://askubuntu.com/a/1075168/247771 I could make it selectable, but when I select it after a reboot, the screen is just black (no image).

Any advice how I can fix it without disabling sleep mode?

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