On Thu, 19 Jun 2014, Jörg Otte wrote:

> I don't know how to do this.

To enable dynamic debugging (as root):

    echo 'module usbcore =p' >/sys/kernel/debug/dynamic_debug/control
    echo 'module ehci_hcd =p' >/sys/kernel/debug/dynamic_debug/control

Do this before you carry out the suspend, and post the resulting dmesg 
log.

Alan Stern

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