On Sun, May 30, 2010 at 9:32 AM, Xiaofan Chen <xiaofanc@xxxxxxxxx> wrote: > On Sun, May 30, 2010 at 9:15 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: >> On Sun, 30 May 2010, Xiaofan Chen wrote: >> >>> > The 09 21 thingy is the HID Class Specifif Descriptor. >>> > Somehow I believe it used to work. >>> > >>> >>> An example: >>> http://www.microchip.com/forums/fb.aspx?m=377479 >>> >>> HID Device Descriptor: >>> bLength 9 >>> bDescriptorType 33 >>> bcdHID 1.11 >>> bCountryCode 0 Not supported >>> bNumDescriptors 1 >>> bDescriptorType 34 Report >>> wDescriptorLength 127 >>> Report Descriptor: (length is 127) >> >> That's right; I vaguely remember it working in the past. What could >> have changed? >> > > It seems to me that Ubuntu 9.10 (32bit and 64bit) is the problem, > at least for me. Not sure the distro Danny is using. > > I just did some quick tests under Ubuntu 9.10 64bit (my laptop) > and Ubuntu 9.10 32bit (my desktop) and they both have the > same problem. The git version of usbutils does not seem to help. > Kind of strange. > > Ubuntu 10.04 (64bit, my desktop) seems to work fine. > Then I did a quick Google search and Ubuntu 9.10 seems to the most affected (just look at the lsusb -vvv output for the HID device, the bug reported is not related to the issue here). http://www.google.com.sg/search?hl=en&source=hp&q=lsusb+-vvv+unrecognized+09+21+&aq=f&aqi=&aql=&oq=&gs_rfai= Ubuntu (9.10) https://bugs.launchpad.net/ubuntu/+source/linux/+bug/368268 http://forum.eeeuser.com/viewtopic.php?id=79783 https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/476510 But Fedora seems to be also affected. https://bugzilla.redhat.com/show_bug.cgi?id=516783 (I believe this is related to the fact that the Kernel HID driver for the HID interface has not been detached, in that case, lsusb seems to have problems). Last time when I encountered this problem, I was thinking that I did not detach the kernel HID driver properly. But in this case, detaching the kernel HID driver does not seem to help in the case of Ubuntu 9.10. Kind of strange. -- Xiaofan http://mcuee.blogspot.com -- 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
