Messages in this thread | | | Date | Sat, 14 Apr 2007 18:33:19 +0200 | From | Matthias Andree <> | Subject | Re: [linux-usb-devel] 2.6.21-rc6 USB Keyboard hangs (EHCI/UHCI/HID) |
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On Mon, 09 Apr 2007, Alan Stern wrote:
> 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.
I arrived at the computer today, to find khubd in D state again, but unfortunately, it does not show up in Alt-SysRq-T output. Do kernel threads show up there at all? 2.6.18.8-0.1 with SUSE patches on openSUSE 10.2.
I had stopped usbmon before however, so I don't know what the events have been leading to this lockup. Sorry. I'll leave usbmon running now.
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