I have just upgraded the machine in question to Lucid, and the camera
now works without me having to disable ehci explicitly, although it does
appear to be at USB1 speeds.

Jun  3 22:52:14 zino kernel: [ 1500.970025] usb 3-2: new full speed USB device 
using ohci_hcd and address 3
Jun  3 22:52:14 zino kernel: [ 1501.179520] usb 3-2: configuration #1 chosen 
from 1 choice
<<< downloaded photos >>>
Jun  3 22:52:55 zino kernel: [ 1541.434940] usb 3-2: USB disconnect, address 3

I notice a comment about a "USB freeze workaround" in the boot log:

Jun  3 22:27:27 zino kernel: [    0.556496] ehci_hcd 0000:00:12.2: applying AMD 
SB600/SB700 USB freeze workaround
...
Jun  3 22:27:27 zino kernel: [    0.570449] ehci_hcd 0000:00:13.2: applying AMD 
SB600/SB700 USB freeze workaround

This is good enough for me :-)

-- 
Can't attach Canon A430 camera via USB to Dell Zino HD
https://bugs.launchpad.net/bugs/499235
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