Hello,

On 10/30/11 8:24 PM, dunbrokin wrote:
> [35549.988027] [Hardware Error]: Machine check events logged
> [38491.477532] CPU1: Core temperature above threshold, cpu clock
> throttled (total events = 11854)
> [38491.478019] CPU1: Core temperature/speed normal
> [38699.988034] [Hardware Error]: Machine check events logged
> [40498.043807] CPU1: Core temperature above threshold, cpu clock
> throttled (total events = 12016)
> [40498.044302] CPU1: Core temperature/speed normal
> [40500.000020] [Hardware Error]: Machine check events logged

These lines state that your CPU is nearly melting. Sometimes this is 
caused by too much dust inside the laptop. Sometimes by a broken fan.

> [40810.824089] usb 2-4: USB disconnect, device number 7
> [40811.116076] usb 2-4: new high speed USB device number 8 using ehci_hcd
> [40811.961614] uvcvideo: Found UVC 1.00 device <unnamed> (046d:0821)
> [40811.974967] input: UVC Camera (046d:0821) as
> /devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4:1.2/input/input21
> [41213.455201] usb 2-4: USB disconnect, device number 8
> [41213.468162] uvcvideo: Failed to resubmit video URB (-19).
 > ...
> [42651.110603] input: UVC Camera (046d:0821) as 
> /devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4:1.2/input/input23


I assume you did not remove the camera 23 times, right? Either the 
camera or your laptop is broken. You should try the camera on another 
machine.

For me it looks like libv4l is innocent and this is a hardware or kernel 
problem.

Thanks,
Gregor

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https://bugs.launchpad.net/bugs/875379

Title:
  Cheese not working properly for external webcam

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