USB device disconnect after suspend/resume

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Hi,

I have the following device that is found durng boot time:

[    1.485763] usb 2-3: new SuperSpeed USB device number 2 using xhci_hcd
[    1.499526] usb 2-3: New USB device found, idVendor=05ac, idProduct=8406
[    1.499527] usb 2-3: New USB device strings: Mfr=3, Product=4, 
SerialNumber=5
[    1.499527] usb 2-3: Product: Card Reader
[    1.499528] usb 2-3: Manufacturer: Apple
[    1.499528] usb 2-3: SerialNumber: 000000000820
...
[    1.731095] usb-storage 2-3:1.0: USB Mass Storage device detected
[    1.731801] scsi host1: usb-storage 2-3:1.0

The device works flawless. lsusb reports the device

However, after the first suspend/resume cycle, I get the following log entry.

[  163.753816] usb 2-3: USB disconnect, device number 2

lsusb reports the device as removed. The USB hub is still present.

The device is built-in to the hardware and you cannot physically disconnect 
the device.

After subsequent suspend/resumes, the device will stay removed.

Only after reboot, the device appears again.

Unloading/loading of usb-storage.ko does not work.

Is there a way to reset the hub or to force a scanning the ports for 
potentially attached devices?

Thanks
Stephan
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