• [gentoo-user] Strange behaviour disconnecting and reconnecting USB-C sc

    From Andreas Fink@21:1/5 to All on Tue Jan 11 10:30:01 2022
    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

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