On Mon, 9 Apr 2007, Matthias Andree wrote: > Please Cc: me on replies, as I read linux-kernel sporadically and am not > subscribed to linux-usb-devel at all. > > Greetings, > > I have seen my USB keyboard drivers lock up several times now with my M$ > Natural Ergonomic Keyboard, both on SUSE 10.2's current kernel as well > as 2.6.21-rc6 today. I don't ever recall this happen with older SUSE > 10.0 kernels. The keyboard is connected to a USB2.0 hub with single > transaction translator (at least that's what FreeBSD 6.2 says), which is > connected to a via root hub. > > Symptoms are that the keyboard LEDs go off and no further input is > impossible (I'm typing this into a PS/2 keyboard). Replugging does not > help. Trying to unload ehci-hcd hangs modprobe, and additionally I've > got a stuck khubd (not sure if that's related), else no logging. > > I'm rebuilding the kernel with HID/USB debugging cranked up to see if I > can get some detail out of the situation. Any specific kernel debugging > options that might help me debug this further?
It would help to see a trace from usbmon showing what happens during a lockup. You can find the instructions in the kernel source file Documentation/usb/usbmon.txt. To help keep the trace simple, try to avoid plugging any other USB devices into that hub or any other high-speed USB devices into the computer. Also, it might help to see a stack trace of khubd (Alt-SysRq-T) when it gets stuck. Alan Stern - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
