ehci_hcd 0000:00:1d.0: HC died; cleaning up

[Martin]

recently, when plugging in my webcam (UVC driver) my USB stack seems to 
collapse. All USB devices including the mouse & keyboard stop working, the 
syslog says:

Apr 24 19:03:45 arnold kernel: ehci_hcd 0000:00:1d.0: fatal error
Apr 24 19:03:45 arnold kernel: ehci_hcd 0000:00:1d.0: force halt; handshake 
ffffc90000052024 00004000 00004000 -> -110
Apr 24 19:03:45 arnold kernel: ehci_hcd 0000:00:1d.0: HC died; cleaning up
Apr 24 19:03:45 arnold kernel: usb 2-1.3: device descriptor read/all, error 
-108
Apr 24 19:03:45 arnold kernel: hub 2-1:1.0: cannot disable port 3 (err = -19)
Apr 24 19:03:45 arnold kernel: hub 2-1:1.0: cannot reset port 3 (err = -19)
Apr 24 19:03:45 arnold kernel: hub 2-1:1.0: cannot disable port 3 (err = -19)
Apr 24 19:03:45 arnold kernel: hub 2-1:1.0: cannot reset port 3 (err = -19)
Apr 24 19:03:45 arnold kernel: hub 2-1:1.0: cannot disable port 3 (err = -19)
Apr 24 19:03:45 arnold kernel: hub 2-1:1.0: cannot reset port 3 (err = -19)
Apr 24 19:03:45 arnold kernel: hub 2-1:1.0: cannot disable port 3 (err = -19)
Apr 24 19:03:45 arnold kernel: hub 2-1:1.0: unable to enumerate USB device on 
port 3
Apr 24 19:03:45 arnold kernel: hub 2-1:1.0: cannot disable port 3 (err = -19)

Cycling through run level 1 (which restarts udev etc.) doesn't help, only 
remedy I found is a reboot.

So far it is only the UVC webcam causing the problem. Memory sticks seem to 
work as expected.

I seem to remember it used to work previously and most likely one of my recent 
kernel upgrades is the trigger (currently on 2.6.38.4). However, before I 
delve into bisecting (the weather forecast for Easter Monday is too good): can 
someone tell what's going on from those error codes in the syslog?

Thanks,

Martin


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