On Thu, 7 Mar 2013, Jenya Y wrote:

> 
> UPDATE  correction to the name of the device Apple Cinema HD Display ( 
> A1082)
> 
> Since kernel 3.8 Apple Cinema Display's usb hub spits errors randomly at
> boot. (their count seems to be random, but the type of the error is
> always the same)
> 
> As soon as I disconnect the usb extension cable the errors are gone.
> 
> 
> Errors
> journalctl
> usb 1-2.2: can't set config #1, error -71
> hub 2-2:1.0: hub_port_status failed (err = -71)
> hub 2-2:1.0: hub_port_status failed (err = -71)
> hub 2-2:1.0: hub_port_status failed (err = -71)
> hub 2-2:1.0: hub_port_status failed (err = -71)
> .....

Is this a problem or is it the expected behavior?

If you want to investigate further, build a kernel with 
CONFIG_USB_DEBUG enabled and post the output from the dmesg command 
showing what happens during boot.

Alan Stern

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