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I use a KVM switch to switch back and forth between a rasberry pi and an Acer notebook running Rocky Linux in console mode so that they can share a keyboard and mouse. Whenever I switch back and forth the Pi does not complain but the Rocky laptop flashes a rush of messages across the terminal such as:

USB disconnect, device number 12,
USB disconnect, device number 13,
New USB device found
New USB device strings

Both devices continue to disconnect and reconnect so at least for now I am not too concerned. However the flood of messages on the Rocky Linux machine is disruptive. Is there any way I can suppress them so that they do not show up?

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Reset to default
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The reconnections are normal. I think it's the cheapest way to build a KVM – it literally switches the input USB ports from one output to another.

You can make the messages not show up on the console, by reducing the "console log level":

dmesg --console-level=notice

I think the default is 'info'. If this isn't quite enough, lower it further to 'warn'. Note that the messages will still show up in dmesg regardless, they just won't be copied to console directly.

This corresponds to the loglevel= kernel option (loglevel=4 is notice, loglevel=5 is warn).

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  • thank you very much! This worked like charm.
    – gatorreina
    Commented Dec 24, 2021 at 21:38

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