From Bugzilla Helper: User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322) Description of problem: I connect to the serial port of my Linux machine via a cisco 2500 router. When I login and I press Ctrl+A and then Ctrl+S, the serial console gets locked and there is no way to recover it. With mgetty this does not happen. Version-Release number of selected component (if applicable): util-linux-2.11y-31.1 How reproducible: Always Steps to Reproduce: 1.Login to machine through serial console 2.Press Ctrl+A and then Ctrl+S Actual Results: Console no longer responds Expected Results: Nothing should happen Additional info: This is the configuration line for the serial console: co:2345:respawn:/sbin/agetty -L ttyS0 115200 vt100 I have also tried without the -L option. With this configuration on mgetty, the problem does not appear-: co:2345:respawn:/sbin/mgetty -r -s 115200 -p "Login: " ttyS0
'Ctrl-S' is the signal to the system to stop sending new data to the terminal. Pressing 'Ctrl-Q' should "unfreeze" things. This is normal and expected behaviour. I don't know why it doesn't work with mgetty - that sounds like the real bug.
You are right. Ctrl-Q unfreezes the console. This was probably the only combination of keys I did not try. Are these control codes documented anywhere?ç Thanks, Fran