Okay, let's go after this, I disabled all modules that I could and am now going to try to see how I can reproduce the error. USB debugging is enabled in the kernel.
To recap, the whole thing is about weird messages about ep0in timeouts and the inability to use the affected device. With USB debugging, this is more verbose! kernel: usb 3-2: new full speed USB device using address 2 kernel: usb 3-2: control timeout on ep0in kernel: uhci_hcd 0000:00:10.2: uhci_result_control: failed with status 440000 kernel: [f6d42240] link (36d421e2) element (1f0f7040) kernel: 0: [df0f7040] link (1f0f7080) e0 Stalled CRC/Timeo Length=7 MaxLen=7 DT0 EndPt=0 Dev=0, PID=2d(SETUP) (buf=0372bc40) kernel: 1: [df0f7080] link (00000001) e3 IOC Active Length=0 MaxLen=7ff DT1 EndPt=0 Dev=0, PID=69(IN) (buf=00000000) kernel: kernel: uhci_hcd 0000:00:10.2: uhci_result_control: failed with status 440000 kernel: [f6d42240] link (36d421e2) element (1f0f7040) kernel: 0: [df0f7040] link (1f0f7080) e0 Stalled CRC/Timeo Length=7 MaxLen=7 DT0 EndPt=0 Dev=0, PID=2d(SETUP) (buf=0372bc40) kernel: 1: [df0f7080] link (00000001) e3 IOC Active Length=0 MaxLen=7ff DT1 EndPt=0 Dev=0, PID=69(IN) (buf=00000000) kernel: kernel: usb 3-2: device not accepting address 2, error -71 I am also seeing these now after another reboot (after completing the rest of this email, which forced me to reboot). kernel: usb 4-6: new high speed USB device using address 65 kernel: usb 4-6: control timeout on ep0in kernel: ehci_hcd 0000:00:10.3: devpath 6 ep0out 3strikes kernel: ehci_hcd 0000:00:10.3: devpath 6 ep0out 3strikes kernel: usb 4-6: device not accepting address 65, error -71 kernel: ehci_hcd 0000:00:10.3: GetStatus port 6 status 001803 POWER sig=j CSC CONNECT Stopping hotplug worked once. However, after starting and stopping it a second time, khubd crashed. It seems that the problem is on removal of ehci-hcd, at least that's the last thing the strace says. In http://albatross.madduck.net/~madduck/scratch/hotplug-khubd-traces.tar.bz2 (about 0.5Mb) you may find dmesg and strace -f outputs of: - hotplug-stop-success.1: a successful hotplug stop - hotplug-start-success.2: the subsequent successful hotplug start - hotplug-stop-FAILURE.3: the final and subsequent failed hotplug stop I hope this is useful information. If you have any questions or need anything more, please contact me. I would be glad to do whatever I can to help you guys solve this problem once and for all! -- martin; (greetings from the heart of the sun.) \____ echo mailto: !#^."<*>"|tr "<*> mailto:"; [EMAIL PROTECTED] invalid/expired pgp subkeys? use subkeys.pgp.net as keyserver! spamtraps: [EMAIL PROTECTED] "all unser �bel kommt daher, da� wir nicht allein sein k�nnen." -- schopenhauer
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