Created attachment 164091 [details]
usb debug output
While attaching Toshiba G450 I get this error:
usbd_req_re_enumerate: addr=4, set address failed! (USB_ERR_STALLED, ignored)
usbd_setup_device_desc: getting device descriptor at addr 4 failed, USB_ERR_STALLED
ugen0.4: <Toshiba Incorporated> at usbus0
umass0: <Toshiba Incorporated Toshiba USB Storage, class 0/0, rev 1.10/0.00, addr 4> on usbus0
this device negotiates only 100mA while it needs the ports to switch to 500mA.
Ian Lepore suggested to set hw.usb.uhub.debug=9, then it loads and works. Setting hw.usb.uhub.debug=0 after the device has been attached is OK.
See attachment for debug info.
FreeBSD rpi2 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r290273: Tue Nov 3 05:23:56 UTC 2015 firstname.lastname@example.org:/usr/obj/arm.armv6/usr/src/sys/RPI2 arm
This was showing signs of failing to attach because it was requesting more power than the port could supply (although the hub on an rpi is configured as self-powered and the ports should allow 500ma attachments). I suggested turning on hub debug to see if it would provide clues about the power, and somehow that made it work. Some kind of timing problem that was "cured" by the extra debug output, maybe?
I also tried on my rpi-b attaching a thumb drive that requires 200ma, and it is able to attach without any errors, so there's something more than just the power involved I guess.
What does "usbconfig -d X.Y dump_device_desc" say about this device?
Did you try to add a quirk for your device? Some device's firmware reset once they receive the first SCSI command they don't support.
usbconfig -d X.Y add_quirk UQ_MSC_NO_SYNC_CACHE
In mass storage mode:
ugen0.4: <Toshiba USB Storage Toshiba Incorporated> at usbus0, cfg=0 md=HOST spd=FULL (12Mbps) pwr=ON (100mA)
bLength = 0x0012
bDescriptorType = 0x0001
bcdUSB = 0x0110
bDeviceClass = 0x0000 <Probed by interface class>
bDeviceSubClass = 0x0000
bDeviceProtocol = 0x0000
bMaxPacketSize0 = 0x0040
idVendor = 0x0930
idProduct = 0x0d46
bcdDevice = 0x0000
iManufacturer = 0x0001 <Toshiba Incorporated>
iProduct = 0x0002 <Toshiba USB Storage>
iSerialNumber = 0x0003 <015020684058>
bNumConfigurations = 0x0001
After adding a quirk, it does not work, see previous comment.
In situation where the modem is plugged while the RPI2 boots, it works. After subsequent unplug/plug, it does not work again.
Can you try connecting the device through a self powered external USB HUB?
If you mean USB hub with its own power supply, then yes, I will connect.
Situation turned in the way that I'll not be able to reproduce the problem any soon. Toshiba G450 I possess, has gone into production with Linux on ARM :-(
Unable to reproduce as of now.