[Bug 88746] Re: ehci_hcd module causes I/O errors in USB 2.0 devices

[jnygaard]

I also caved in and inserted a new pci-card with a USB 2.0 controller
and some ports.

Two really surprising things happened: First, I would have thought it
necessarry to disable the onboard (motherboard) USB controller, since
that was the one not working with ehci_hcd. (I base this on the fact
that I got the "reset-errors" even without using any USB devices
connected to the ports, as if the host controller itself had
problems...) This was not correct, even when this is enabled and
ehci_hcd now loaded, everything works without a glitch, under high
stress!

Second, I thought the onboard (motherboard) USB controller/ports would
be useless after disabling the controller in BIOS for these. The really
strange thing is that now (since I did not need to disable USB in BIOS I
tested this) the onboard USB ports suddenly work at full speed also. I
simply do not understand how this can be. It is as if the mere presence
of the new controller causes the problem to go away...

-- 
ehci_hcd module causes I/O errors in USB 2.0 devices
https://bugs.launchpad.net/bugs/88746
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