This is my current USB configuration, and it 'locks up' the BIOS POST
process 100% of the time whenever the switched USB chain is plugged in
while the BIOS POST is in control. I've never waited for more than a couple
of minutes to see if it'd eventually do something different, but to givel all
keyboard stimuli and available visual cues it seemed to just be locked up.
Motherboard USB Port A
-> SanDisk Corp. SDCZ2 Cruzer Mini Flash Drive (thin)
Motherboard USB Port B
*********** -> USB switch
****************** -> Keyspan USB 1.1 5-port HUB A -- AC powered and AC power connected.
********************* -> Link to Keyspan USB 1.1 5-port HUB B -- Physically Disconnected
********************* -> Microsoft Corp. Internet Keyboard Pro with built in 2 port USB hub (empty).
********************* -> Creative Technology, Ltd Fatality 1010 mouse
********************* -> DELL 2405 LCD Monitor with built in USB 1.x hub, and memory card reader.
*************************** -> Microsoft Corp. Wireless Intellimouse Explorer 2.0
*************************** -> Canon PIXMA IP 2000 printer
So that's one external hub branching out in "Y" parallel to two more
connected USB hubs. My 'full' configuration (involving the hub
I indicated as disconnected) would involve several other devices
and chained hubs, though it doesn't even take that to lock up the BIOS,
it crashes 100% with even the simple stripped down configuration.
I can hardly remove the built in hub/card reader in the keyboard and
the monitor, and of course I need the keyboard + monitor to boot, so,
other than having an extra mouse attached I'm pretty much down
to a very common sort of minimal setup already:
USB keyboard + 2 USB mice + card reader + printer + few incidental hubs.
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