[Lcdproc] usb2lcd display now working on MacOS 10.4

[Ethan Dicks]

Since I asked around on the list about this, I thought I'd follow up
on my progress for the list archives if nothing else.

Starting with a recently LCDproc nightly and libusb 0.1.12 from
Sourceforge, I was originally unable to get reliable use of my usb2lcd
interface under either LCDproc _or_ the libusb test suite (in
./tests).  Nathan Hjelm, the libusb Darwin Port maintainer, has been
exceedingly helpful in hammering out some issues with libusb to the
point that it now all works (the hardware took an extra step, as it
also seems that I need to fit the 3.6V zener diodes to the USB lines
as mentioned might be required on the usb2lcd web page - it's working
through a hub, but doesn't work at all when directly attached minus
the diodes).

For anyone that is struggling with libusb 0.1.12 and Mac OS 10.4, I'd
suggest finding/waiting for the next release of libusb and checking
the release notes and darwin.c for evidence of some changes relating
to removal of bulk transfers and descriptor checks for virtual hubs.

Now I just need to tweak my MacBook power settings to not hibernate my
laptop when it's plugged in - everything comes back, but while asleep,
it appears that everything is suspended, including LCDd.

-ethan