Comment 4 for bug 215081

I can confirm that the same issue is in Interpid too.
My device is 0763:1010 Midiman Midisport 1x1.
I used the same patch as Max used expect two differences.

The first difference is, that there is nothing commented id /etc/init.d/mountdevsubfs.sh, you must insert missing part to the start procedure.
The second thing is, that domount command does not work. So, you must modify patch like this:

# Magic to make /proc/bus/usb work
#
mkdir -p /dev/bus/usb/.usbfs
mount -t usbfs "" /dev/bus/usb/.usbfs -obusmode=0700,devmode=0600,listmode=0644
ln -s .usbfs/devices /dev/bus/usb/devices
mount --rbind /dev/bus/usb /proc/bus/usb

I can confirm the same issue after the fix: "the firmware load hotplugging works, but apparently not at boot time."