I did a bit more testing, and it seems like the USB mouse/keyboard handling in 
b131, at least for SPARC and/or SB1500, is a little wonky. To avoid any extra 
complications, I removed my KVM switch from the picture and tried various 
combinations of keyboard/mouse and USB port.

The Sun Blade 1500 (silver) shipped from the factory with 7 USB ports as 
follows:

front panel = 2 x USB 1 (call these F)
rear panel = 2 x USB 1 (call these R)
add in card = 3 x USB 2 (call these C)

We use two types of keyboards:

Sun type 6 USB keyboard with separate USB mouse (call this T6)
Sun type 7 USB keyboard with internal USB hub and attached USB mouse (call this 
T7)

My results were:

T6 into F: works okay, disconnect+reconnect work fine

T6 into R: does not work at all

T6 into C: works okay, disconnect+reconnect work fine

T7 into F: initially neither the keyboard or mouse work, but switching to the 
other front port gets them both going; a subsequent disconnect+reconnect on the 
other port stops the keyboard working, but then switching back to the first 
front port gets things going again.

T7 into R: same as T7 into F.

T7 into C: from boot the keyboard isn't detected and the machine boots 
headless; if connected after boot (i.e. machine booted up with a different 
keyboard/port combination then T7 attached) then the behaviour is the same as 
for the F and R ports above.

I *think* that this may have something to do with the presence/absence of USB 
hubs since:

- that is one of the main differences between the T6 and T7 keyboards
- the behaviour documented above changes somewhat if I put the KVM switch 
(which also has an internal USB hub) back in place
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