Hi, On Mon, Jun 27, 2011 at 02:25:06PM -0400, Alan Stern wrote: > > So, what actually _are_ these transaction errors ? What is EHCI > > complaining about ? I'm also attaching usbmon traces FYI. > > Transaction errors are low-level bus protocol errors. They could be > caused by noise or by failure to receive a proper response packet. > For example, when the host sends a SETUP packet the device is supposed > to reply with an ACK within a few microseconds. If no ACK is received, > the SETUP is retried. After three failed attempts you get a > transaction error. ok. > In your case it does look like a hardware failure of some kind. Hard > to tell exactly what is broken, though. The best way to find out is to > plug the device into a different computer and to plug a different > device into that EHCI controller. > > Since you have already tried different UDCs, the problem probably isn't > at that end. It might even be something wrong with the USB cable. I see... I'll keep trying different cables and such, but it's quite weird problem ;-) -- balbi
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