I'm using the libusb-win32 1.2.60 filter drivers on my system to get PCSX2 to work with my Dualshock3. Unfortunately that plugin is a bit outdated, and only works with the libusb filter drivers, and not the newer INF based drivers. Regardless, with a filter driver active (DS3 connected or not), the standby mode on my computer doesn't work properly. I hit standby, and it goes to sleep mostly as normal, but it takes longer and races the CPU as it sleeps (this motherboard has advanced fan controls, increases fan speed based on heat). When I try to rouse it from it's nap, the computer comes on and the monitors fire up, but the USB devices never come on, and nothing is displayed on the screens. It will be stuck in this state indefinitely, I have to hit the reset button for it to come back. Then it says "resuming windows" as if it was coming out of hibernate, and then comes back.
Obviously, this is a minor issue, but it is annoying. My Z77 motherboard has alot of advanced suspend modes, that allow it to go to sleep, but shut down akin to hibernate, while using very little power and coming back instantly. I really miss it... Removing the filter driver restores the computer to normal, but then I have no DS3, obviously.
Using LibUSB-win32 1.2.6.0
Windows 7 x64 (sp1)
Core i5 3570K @ 4.7ghz
Asus P8Z77-V LX
8GB Corsair Ballistax DDR3-1600 (4GBx2) memory
Sorry for the late reply. Are you only filtering the specific device (device filter using the filter wizard) or filter the whole USB system (Class filter)? The later is not supported.
Closing old entry. Please use libusb-win32 mailing list for future discussions.