While working with Classmate (toward the very end of Hardy), it was
discovered that simply enabling USB_PERSIST is not enough. We need
another patch[1] to get it to work correctly. However that patch doesn't
quite work due to another patch[2] in the Hardy tree. Since getting this
fixed in the short time was not possible, the USB Persist patch[1] did
not make it into the Hardy release.

It is now being made available through the classmate PPA[3]. Adding that
to your /etc/apt/sources.list should get you the new kernel when it is
built.

Also, I am currently not sure if eeePC will also require the
CONFIG_MMC_UNSAFE_RESUME option set, but I suspect it will.

[1]. http://thread.gmane.org/gmane.linux.usb.general/1899
[2]. UBUNTU: USB: EHCI: add separate IAA watchdog timer 
(978a8bed296d7f5d76c57018417bee79046354a1) 
[3]. https://edge.launchpad.net/~cmpc-developers/+archive

-- 
[hardy] kernel should have usb persist mode built in
https://bugs.launchpad.net/bugs/197166
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