On Fri, 30 Apr 2010, Stephen Warren wrote: > Linux is having problems fully recognizing one of my USB devices, a > Logitech Harmony 700 universal remote control. I also have a Logitech > Harmony 880 (and other USB devices) which work fine on the same PC and > USB connector. > > The issue is that lsusb shows bNumConfigurations=0. There should be one > configuration with a couple of end-points. Sometimes lsusb will show the > expected results (e.g. 1 in 10-20 times it's plugged in) and > communication with the remote works as expected. Also, the 770 has a > special "safe mode" (which boots alternate firmware), and when in this > mode, lsusb always shows bNumConfigurations=1 as expected. > > I've tried a couple different kernels without any luck: 2.6.32 (Ubuntu > Lucid latest desktop kernel) and 2.6.34 (Ubuntu Lucid build of > "upstream" kernel, I believe without any Ubuntu patches) > > I'm attaching a variety of debug information: The usbmon traces show that the device sometimes dies when it receives a Get-Device-Qualifier request. Not always, but sometimes. I have no idea why it would do this. A firmware bug would generally cause it to die every time, but there's no other obvious explanation. Particularly since the alternate firmware does not die; it handles the request correctly. Alan Stern -- 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
