I've investigated this somewhat, and the only conclusion I have is that
some OHCI controllers are buggy.  There is a remote other possibility:
if the PCI bus is hogged totally by the X server this could possibly happen.

    -- Lennart


Phil Pereira wrote:

>Hi all,
>
>Whenever I use X on my netbsd box, and then exit it when I'm finished, I find a series of messages on CLI in green which say:
>ohci0: 2 scheduling overruns
>ohci0: 1 scheduling overruns
>....
>
>according to "man" ohci is the USB Open Host Controller - any ideas why it's having "scheduling overruns" when I use X (v 4.3.0)?
>
>  
>