On Wed, Jun 13, 2012 at 08:59:38AM -0700, Mark Lanctot wrote: > Hello Sarah! > > I'll cut and paste because Yahoo's quote system doesn't work well. > > "Your device sounds really really flaky. There doesn't seem to be a > consistent failure mode, and the errors aren't repeatable. I'd > actually suggest you return the device and get a different brand. If > the device fails to enumerate now like this, who knows how stable it > will be in the future?" > > Actually all the testing you've prompted me to do has resulted in me > getting it to work consistently with just a little awkwardness...see > below. Ah, ok, great! > "Does it fail consistently when you disable auto-suspend, but unplug > and replug the power adapter in between tries?" > > I disabled auto-suspend. Unplugging and replugging the power adapter > always causes the device to fail to enumerate. BUT...unplugging and > replugging the USB cable while the power is on always causes it to > work, with auto-suspend on or off, other devices on the USB 3.0 > controller or not, doesn't matter! So now I have a way to get it to > work consistently - plug it in, turn the power on, let it fail, remove > and replug the USB cable. Weird but it works, and sure beats plugging > in another device into the other USB 3.0 port on the back. Huh, ok, sounds like an odd device issue then. > Would this have anything to do with the hard drive attached to the > device spinning up and not being ready? It seems that once the drive > is spinning everything works fine - if another USB device is plugged > in, it enumerates and if the USB cable is removed and reinserted it > enumerates. It won't enumerate if the drive is spun up while the USB > cable is plugged in. The hard drive not being ready is more of a file > system issue though, I'm not sure if the USB controller cares what > state the drive is in when it's issued an address. I have no idea if your hypothesis is correct, but it sounds reasonable. > However since I can get the device to work consistently with just a > little rain dance required, if you don't find a bug in xHCI you can > close this bug. If you would like me to do more testing I'd love to > help. I think I'll just close the bug, since it seems like a device issue. > Again Sarah, thanks so much for the assistance. Without all the > testing we've done I would never have gotten this to work at all. I > appreciate your time and effort. No worries! Thank you for debugging on your end. :) Sarah Sharp -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
