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Theo wrote:
> What does:
>
> sudo dmesg
>
> say immediately after you plug it in? You can print the last 30 lines with:
>
> sudo dmesg | tail -30
>
It says "I/O error", or words to that effect, in any
shell prompt. Enter produces a CR/LF combo and repeats
the prompt, but any typing provokes the I/O error message.
> It seems like the USB serial adapter wedges the USB subsystem, which is
> problematic given your root filesystem is also on USB storage. The storage
> stops responding, and over time programs get increasingly unhappy that their
> storage is not functioning.
>
Yes, that's my thinking too.
> Another thing to try is to plug the serial adapter into a USB2 port, which
> is a different controller on the Pi4 from the USB storage. Maybe that won't
> break the storage?
>
That's what I did, sorry if it wasn't clear. There is a keyboard on
USB2, so there's still potential for interaction and maybe the
"I/O error" is in reference to the keyboard input. Likewise,
the mouse hangs off a hub in the keyboard, so clicking on an
icon produces a similar effect..
You've brought up something that never crossed my mind. I've been
thinking "disk i/o", maybe it's "keyboard i/o" being reported.
Either way, it seems like a bug, except that few see it.
Strange.
Thanks for writing
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