Ubuntu

  1. Bug #414604
  2. Comment #19

Comment 19 for bug 414604

Revision history for this message
Alexander Sack (asac) wrote : Re: [Bug 414604] Re: [KARMIC][REGRESSION] Network Manager .8 broken with UM175 (Verizon/Alltel wireless)

On Fri, Sep 04, 2009 at 09:13:54PM -0000, Noel J. Bergman wrote:
> Not fixed, yet, but actively being worked on. There are a couple of
> outstanding issues. The primary remaing cause of THIS bug is shown by:
>
> Aug 21 09:51:30 karmic pppd[4296]: pppd 2.4.5 started by root, uid 0
> Aug 21 09:51:30 karmic pppd[4296]: Baud rate for /dev/ttyACM0 is 0; need explicit baud rate
> Aug 21 09:51:31 karmic pppd[4296]: Exit.
>
> We think we know what causes it, and are investigating a fix on #nm.
>
> Another issue does come from NetworkManager, but is not the primary
> cause of THIS bug.
>

from what i understood the underlying issue is that modemmanager does
not serialize disconnects (and probably other operations that modify
the baud rate of the tty).

This sounds easy to fix by dropping (or queuing) incoming disconnect
requests if there is another operation running.

Not sure what dan thinks about this approach though ;).

 - Alexander