USB hub does not always initialize on boot
I've got a GWC 7-port USB hub that is running just fine unpowered. However, sometimes when I reboot or shutdown, the USB hub will not initialize. I am not sure if this is a mobo, BIOS, or hub issue. If I just unplug the USB cable running from the hub to the mobo and plug it back in, all the USB devices initalize just fine.
But this is not something that I am going to want to do when I get the system moved in to the car. For my next point I want everyone to remember that most USB ports still supply power even when the computer is off. Running on the bench with a normal PSU I assume my USB ports are staying active. I'm hoping that when I start using the OPUS in the car I will not have this problem but I still want to do my research ahead of time. The OPUS should cut all the power to the mobo when I put the system into hibernate.
If it still happens with the OPUS then here is another option:
Splice in to the +5VDC wire in the USB cable and add in a relay. I the +5VDC from the OPUS to use as the trigger. In theory, when the OPUS is off, the relay path will be broken (unplugged). When the OPUS is on, the relay path will be closed thus act as if it is plugged in...
Another option would be to run the hub with the power adapter. Don't think this is going to solve the problem.
Since I've been typing this I remember reading a post about OPUS and USB port issues. Time to go searching but I am still going to post this topic and see where it leads to.