After sending the IRQ stats to you, I decided to do the same for the NEC USB 2.0 card that I have running on the VT8235. It appears that the NEC 2.0 card is more unstable on the VT8235 than VT8235's EHCI controller itself (the NEC USB 2.0 controller is otherwise rock solid stable on other computers I've testedit on and will never hang).
After writing 70Mb to the USB 2.0 HDD with the NEC controller: ehci-hcd 00:0a.2 (NEC): irq normal 19977 err 1 reclaim 2051 (lost 5)
ehci-hcd 00:10.3 (VIA): irq normal 0 err 0 reclaim 0 (lost 0)
Most curious. It suggests that the VT8235 problem might be more like "southbridge loses IRQs" than "EHCI in southbridge loses IRQs". I've never seen anything except the VT8235 EHCI losing those reclaim IRQs before though.
(By the way: those "err" statistics include things like stalls, which aren't actually errors, as well as USB protocol issues. As a rule they're nothing to worry about, just another way for USB transfers to complete.)
- Dave
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