ums fails to initialise correctly

[Chris Hedley]

On Mon, 22 Feb 2010, Chris Hedley wrote:

> I'm having a lot of problems getting the ums (USB mouse) driver to initialise 
> the mouse correctly.

I've been wading through the kernel source trying to see if I can find 
anything, but nothing's grabbed me yet.

What I'm looking for is something that would explain:

a) why does the keyboard not have the same problem when using the same KVM 
switch when it's also a high-speed device?  There are differences in the 
ums and ukbd modules (obviously) but I lack the experience to see which 
ones may be relevant.

and

b) why does the mouse initialise correctly when physically disconnected 
and reconnected, but not when simply switching back and forth with the KVM 
or using the usbconfig power_on/power_off/reset command?  I'm assuming 
that the physical reconnection calls some additional piece of code that 
isn't called by a logical reconnection, though I've little enough idea of 
where to even start looking let alone how to fiddle about with it.

Anybody experienced with this area of code have any pointers for me?

Thanks!