[NTLUG:Discuss] Kubuntu Serial Ports

[Michael Barnes]

On Wed, Sep 9, 2009 at 4:11 PM, Chris Cox <cjcox at acm.org> wrote:

> On Wed, 2009-09-09 at 14:57 -0500, Michael Barnes wrote:
> > I have a machine with an on-board serial port, plus I added a four port
> > serial card.  I installed Kubuntu 9.04 (latest download this morning).
>  When
> > the installation was finished, I did
> > $ ll /dev/ttyS*
> > and it showed me a list of ttyS0-ttyS7 as expected.  A few minutes later,
> I
> > started getting all kinds of low disk space warnings and realized I'd
> messed
> > up the partitions.
> > At that point, it was just as easy to re-install, so I did, setting up
> the
> > partitions properly this time.
> >
> > My problem is now it only shows ttyS0-ttyS3.  The on-board port and the
> > first three ports of the card work fine as com 1-4.  But I cannot get it
> to
> > show the other four ttyS ports like it did before.
> >
> > Any ideas on where a setting for maximum serial ports is?  I've found it
> > mentioned a few places in searches, but not actually how to fix it.
>
> Ideally, this is all handled through device detection and udev for the
> device creation.  So... probably not a max serial port issue.
>
> Poweroff, remove the card, reboot, then poweroff, add card, boot.
>
> See if that fixes things.  Just an idea.
>


Not really a detection issue.  I can go into BIOS and disable the on board
port and it boots up with ttyS0-3 using the four ports of the card.  I can
take the card out and still show /dev/ttyS0-3.  I believe I misspoke above,
getting my machines confused. I erred when I said it showed 8 ports.  All of
the Ubuntu machines show only four serial ports under /dev.  My SUSE and
Centos machines all show eight serial ports.

Must be an Ubuntu thing.

Michael