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Aero Windwalker
Asked: 2017-09-06 08:31:04 +0800 CST

How to prevent Ubuntu from throwing error after removing the USB keyboard?

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I use a USB switcher to control multiple Ubuntu, which means it electronically (like shorting it almost I guess, maybe, not entirely sure) unplug the USB without removing the USB device physically from the machine after I switch from one machine to another. A harmless but annoying thing is after I switch, the system will throw error like:

[123] usb 1-1.1-portx: cannot reset
[124] usb 1-1.1-portx: cannot reset
[125] usb 1-1.1-portx: cannot reset
[126] usb 1-1.1-portx: cannot reset
[127] usb 1-1.1-portx: cannot reset
[128] usb 1-1.1-portx: cannot reset

Of course this won't actually does harm to any service running on the machine but kind annoying to see on the screen, is there a way to prevent it from happening?

I tried modifying /etc/sysctl.conf and in which I uncomment kernel.printk = 3 4 1 3 to stop low-level messages on console, and then reboot, yet the messages persists.

usb

1 Answers

  1. It looks like a kernel message. I would lower the kernel log level in the console:

    From https://superuser.com/questions/351387/how-to-stop-kernel-messages-from-flooding-my-console

    In the file /etc/sysctl.conf

    # Uncomment the following to stop low-level messages on console
kernel.printk = 3 4 1 3
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