N810 hanging in USB host mode

I finally reinstalled scratchbox after upgradingthe OS on my desktop 
(64-bit Fedora Core 9, now need vdso32=0 kernel parameter as per docs)
and had a go at compiling gphoto2.
Which worked 

However, my tablet keeps locking up in USB host mode, then (AFAIK) the 
watchdog reboots it.

One time, I was able to take a photo and download it using 
lunkwill-canon-capture from libgphoto2 examples. But in general, USB 
access is fatal.
I have the camera connected via 2 cables and an F-F adapter. The camera 
shows as self-powered in "lsusb -v"

When I was running Chinook, I was able to quite reliably access a small 
USB memory stick directly (but now I can't find it). And I have a cheap 
powered hub that I believe I could use to access larger SD cards via an 
adapter. Now, under Diablo, I can't see anything on the hub at all. It 
works OK on my desktop.

Having it almost work is quite frustrating. I would like to use the 
tablet to trigger the camera on a tripod, and downloading images via 
cable is less messy than transferring a micro SD card.

Linux Nokia-N810-23-14 2.6.21-omap1
usbutils 0.72-8osso2
usbcontrol 1.0
libusb-0.1-4 2:0.1.12-5osso1
gphoto2-2.4.5
libgphoto2-2.4.5

Any suggestions ?

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Andrew Daviel, TRIUMF, Canada