Subject: Re: serial related crash
To: None <>
From: Mike Long <>
List: current-users
Date: 11/15/1995 15:54:27
>Date: Wed, 15 Nov 1995 08:50:04 -0600
>From: Randy Terbush <>
>> >The other day I wanted to make ppp redial, so I just flipped power to the
>> >external modem off.  The machine responded by locking solid.  No errors,
>> >no pings, no disk activity, no network activity; required punching the reset
>> >button.  This is the sort of thing I used to see when I was using SLIP and
>> >a set of nasty scripts to bring up and maintain the slip line.
[michaelv wrote:]
>> I've seen exactly the same behavior, occasionally.  Every now and then
>> my modem will get in a funky state, and I'll just reach over and flip
>> it off, then back on.  This used to be a painless fix.  Since
>> upgrading from 1.0 to current, however, it can cause these lockups.
>> (Yes, I'm running with my ESP-patched com.c driver now, but I'm almost
>> positive that it did it even with the stock driver.)
>I am *not* running with your ESP driver and still have problems.
>My problems (Window manager dies) can be caused simply by loss
>of PPP connection. The Xserver is still running, but all windows
>have died.

It can't be just that.  I've had my PPP connection die quite often
while I was in X, and X has never died on me.  It may be
modem-specific, though: I have an internal modem, so it doesn't turn
off unless the whole box does.

Do any of you have a voltmeter and a breakout box?  The hangups and/or
X death may occur because your modem drops DSR when you turn it off,
or something like that.
Mike Long <> 
VLSI Design Engineer         finger for PGP public key
Analog Devices, CPD Division          CCBF225E7D3F7ECB2C8F7ABB15D9BE7B
Norwood, MA 02062 USA                assert(*this!=opinionof(Analog));