Subject: Re: serial console blocking problem
To: Thor Lancelot Simon <>
From: Patrick Welche <>
List: current-users
Date: 12/12/2007 11:42:54
On Tue, Dec 11, 2007 at 06:30:20PM +0000, Patrick Welche wrote:
> On Tue, Dec 11, 2007 at 11:15:30AM -0500, Thor Lancelot Simon wrote:
> > On Tue, Dec 11, 2007 at 02:39:12PM +0000, Patrick Welche wrote:
> > > 
> > > That seems to make sense, but I'm a little puzzled, as the box hasn't got
> > > stuck before, yet had the same setup of serial console with nothing
> > > plugged into the other end of the cable. Am I missing something?
> > 
> > Did you turn on flow control, or turn off ignore-DTR (the "local" flag)
> > on the console TTY?
> Yes, from /etc/ttys:
> tty00   "/usr/libexec/getty std.57600"  unknown off local

Now for the important detail I missed out: there was

uplcom0: Prolific Technology PL2303 Serial adapter (ATEN/IOGEAR UC232A), rev 1.10/2.02, addr 2
ucom0 at uplcom0

plugged into the serial cable, but the USB end wasn't plugged into anything.
Whether the USB adapter is connected or not seems to make all the difference
between process blocking or not.