Frequent USB mouse disconnections under load with RELENG_7

[Jeremy Chadwick]

On Fri, Feb 01, 2008 at 10:00:11PM +1030, Wayne Sierke wrote:
> - I've also just noticed that I'm getting these messages on startup
> under 7.x:
> 
>         kernel: Starting devd.
>         kernel: Starting ums0 moused:
>         kernel: Starting default moused: 
>         moused: unable to open /dev/ums0: Device busy
>
> but I can't now recall whether I was seeing those under 6.x. Has devd
> changed with 7.x? I've got a feeling that I'd tried to get devd in 6.x
> to handle the USB mouse on startup, but that I'd found it necessary to
> configure moused explicitly (i.e. with moused_port) in rc.conf as listed
> below. However my memory of it now is hazy at best. In any case,
> disconnections aside, I've not noticed any change in mouse behaviour
> since moving to 7.x either in console or xorg.
> 
>         moused_enable="YES"
>         moused_port="/dev/ums0"

I think this is what's happening here:

* kernel starts
* usb stack loads, finds a USB mouse, attaches it to ums0
* attachment tells devd "hey, theres a /dev/ums0 device that
  just attached"
* /etc/devd.conf automatically spawns moused, which attaches to
  the /dev/ums0 device
* rc scripts begin
* moused_enable="yes" is detected, thus moused is run manually
  against /dev/ums0
* moused is already running from when devd spawned it, which is
  why /dev/ums0 is "Device busy"

I would recommend removing the moused_* stuff in your rc.conf and
let devd take care of it, or, consider editing /etc/devd.conf and
removing the /dev/umsX detection which runs moused.

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