Hi again,

meanwhile I did some debugging.

QuickPort dump_device_desc:
http://pastebin.com/h62jLHui

QuickPort dump_curr_config_desc:
http://pastebin.com/6rheBiMi

Debug messages (hw.usb.debug=4):
http://paste2.org/p/1733421

I found an external HDD enclosure (Sharkoon Rapid-Case 3.5" SATA USB3.0)
which uses the same SATA bridge chip (ASM1051, Vendor 0x174C, Product
0x55AA). Attached to an USB port it uses high speed instead of full
speed of the QuickPort.

Rapid-Case dump_device_desc:
http://pastebin.com/B7suMZG7

Rapid-Case dump_curr_config_desc:
http://pastebin.com/D6xPyYUp

The only difference I could find is wMaxPacketSize in Endpoint 0 and
Endpoint 1 is set to 0x40 for the QuickPort. The Rapid-Case external
enclosure has set wMaxPacketSize to 0x200.

Having a look at lsusb's output under Linux wMaxPacketSize is set to
0x200 even for the QuickPort:

http://pastebin.com/fMcxhKax

If more debug information is needed don't hesitate to ask. :-)

        Best regards
                Franz

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