Problem with ebook reader on usb

Hiho! :-)

I got myself a new ebook reader (Onyx M92), but encountered a strange
problem when connecting it to my freebsd machine. Shortly after
mounting it, the device gets disconnected (causing the mounted storage
to disappear). There is no such behavior with Windows 7.

uname -a:
FreeBSD xxx 11.0-CURRENT FreeBSD 11.0-CURRENT #11
r258254M: Sun Nov 17 13:38:01 CET 2013
xxx:/usr/obj/usr/src/sys/SUBMARINE_SMP  amd64


The device identifies as follows:

Dec  2 17:45:51 ubm kernel: ugen4.2: <Linux 2.6.35.3-gd7932e6-dirty
with fsl-usb2-udc> at usbus4 

Dec  2 17:45:51 ubm kernel: umass0: <Mass Storage> on usbus4 

Dec  2 17:45:51 ubm kernel: da0 at umass-sim0 bus 0 scbus3 target 0 lun
0 

Dec  2 17:45:51 ubm kernel: da0: <Linux File-Stor Gadget 0326>
Removable Direct Access SCSI-2 device 

Dec  2 17:45:51 ubm kernel: da0:40.000MB/s transfers 

Dec  2 17:45:51 ubm kernel: da0: 3156MB (6463552 512 byte sectors: 255H
63S/T 402C) 

Dec  2 17:45:51 ubm kernel: da0: quirks=0x2<NO_6_BYTE>

I tried setting (widly guessing):
hw.usb.power_timeout: 30 -> 0
hw.usb.no_cs_fail: 0 -> 1

but to no avail.

Setting "hw.usb.debug: 1" yields no additional output.

usbconfig dump_device_desc yields:
ugen4.2: <File-backed Storage Gadget Linux 2.6.35.3-gd7932e6-dirty with
fsl-usb2-udc> at usbus4, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=ON (2mA)

  bLength = 0x0012 
  bDescriptorType = 0x0001 
  bcdUSB = 0x0200 
  bDeviceClass = 0x0000 
  bDeviceSubClass = 0x0000 
  bDeviceProtocol = 0x0000 
  bMaxPacketSize0 = 0x0040 
  idVendor = 0x0525 
  idProduct = 0xa4a5 
  bcdDevice = 0x0326 
  iManufacturer = 0x0001  <Linux 2.6.35.3-gd7932e6-dirty with
  fsl-usb2-udc> iProduct = 0x0002  <File-backed Storage Gadget>
  iSerialNumber = 0x0003  <3230204E6F76>
  bNumConfigurations = 0x0001 

Anybody got any ideas? :-)


Bye
Marc