After 7.3->8.1, moused on serial mouse draws 100% CPU

Jeremy Chadwick freebsd at
Thu Sep 16 09:16:02 UTC 2010

On Thu, Sep 16, 2010 at 11:02:38AM +0200, Michael Sperber wrote:
> After upgrading from 7.3 to 8.1, moused has started drawing 100% CPU
> (even when the mouse is not used).  moused -d -f doesn't output anything
> suspicious  - in particular, it does not display anything when the mouse
> is not moved.
> root    10833 100.0  0.1  1732  1100  v0  R+   10:51AM   8:47.62 /usr/sbin/moused -d -F 200 -A 1.5 -a 0.5 -p /dev/cuau0 -t auto -d -f
> FWIW, I was using the uart serial driver even on 7.3.  (Maybe this is
> also the time to mention that mouse movement got much slower after the
> move to uart - that's why the -F -A -a settings are in there.)
> Any help would be much appreciated!

Adding ed@ to CC list, since he maintains uart(4), which is now the
default serial driver on 8.x.

Michael, in the meantime can you provide dmesg details that pertain to
your serial ports?  uartXX devices would be sufficient, in addition the
device its attached to (e.g. acpi0, etc.).


(Footnote: I wasn't even aware people still had/used serial mice any
more, given the popularity of PS/2, and now USB...)

| Jeremy Chadwick                                   jdc at |
| Parodius Networking              |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |

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