this post was submitted on 09 Jun 2025
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I connect to mine with a USB serial adapter, since my laptop doesn't have one built-in, which I wish it did. Software-wise, I just use screen because I am lazy to use something like Minicom.
Just don't set any low baud rate for Linux. It will wait for logs to be printed out while booting. Though perhaps you can reduce the loglevel, I haven't tried that. I've tried 300 baud for fun, and that wasn't fun. I think it was over half an hour to boot up just waiting for logs to print.
I honestly don't remember what I did, but this lies in my
/etc/default/gruband looks relevant:Also it's useful to then set width, height and terminal type. I think terminal type is in
$TERM, and size is set withstty, but I am not sure. It's been a while.You may also need a "null modem adapter" to reverse RX and TX, but oddly enough, that actually makes it not work with my adapter, despite it also working when directly connected to a switch. Maybe it can figure out which end it's supposed to be? Dunno.
Alternatively you can also start a serial tty as a systemd service if you're looking to troubleshoot after boot primarily. I do this on my server for VM networking misadventures.