When I boot my server one of my usb3 disks is consistently not detected. 
Unplugging it and plugging it back in again forces detection and it works 
correctly thereafter, but this requires me to be there to do it...

I can see the device in sys, and have tried removing it (echo 1 > 
/sys/bus/usb/devices/3-4/remove) and dmesg says that the device is redetected 
again:

[58372.630911] usb 3-4: USB disconnect, device number 5
[58372.956506] hub 2-1:1.0: unable to enumerate USB device on port 4
[58373.196541] usb 3-4: new SuperSpeed USB device number 6 using xhci_hcd
[58373.212456] usb 3-4: Parent hub missing LPM exit latency info.  Power 
management will be impacted.
[58373.213048] usb 3-4: New USB device found, idVendor=0bc2, idProduct=50a1
[58373.213053] usb 3-4: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[58373.213058] usb 3-4: Product: FA GoFlex Desk
[58373.213061] usb 3-4: Manufacturer: Seagate
[58373.213064] usb 3-4: SerialNumber: NA0L84NG
[58373.213942] scsi15 : usb-storage 3-4:1.0
[58374.324733] usb 3-4: reset SuperSpeed USB device number 6 using xhci_hcd
[58374.340431] usb 3-4: Parent hub missing LPM exit latency info.  Power 
management will be impacted.
[58374.340621] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with 
disabled ep ffff8801648fa8c0
[58374.340626] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with 
disabled ep ffff8801648fa900

But obviously there are a few errors, and usb-storage never actually sees the 
device properly (no /dev/sdX entry for it). Is there a way to turn the port off 
completely and then back on again so I can simulate an unplug/plug event a bit 
better? I've tried the various power/control and power/level files in /sys but 
nothing seems to work.

Replacing the USB3 card is on the agenda but I'm looking for a workaround in 
the interim. USB3 adapter is 1106:3432 USB controller: VIA Technologies, Inc. 
VL80x xHCI USB 3.0 Controller (rev 02)

Thanks

James
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