As I try and work through this moronic USB modem issue, I’ve come across some similar situations, most of which have ended up being IRQ conflicts between the USB Host Controllers and audio or video cards.
In particular, I’m looking at IRQ 18 on my machine:
18 NEC PCI to USB Open Host Controller
18 NVIDIA GeForce 7800GT
18 VIA USB Enhanced Host Controller
All IRQ’s are being used up to 23 at the moment. Unfortunately, my BIOS only allows me access (PCI or Reserved) up to 15. Vista is not allowing me to rearrange IRQ assignments.
1) Is this IRQ possibly the source of my issues with a USB modem that constantly freezes?
2) How can I get the IRQ assignments changed through Vista?
I can post the other IRQ’s as well, if necessary.
PC specs are as follows:
Asus A8N-E, non-SLI, BIOS Rev. 1013
AMD Athlon 64 X2 4800+
Onboard audio
BFGTech GeForce 7800GT
two separate generic USB2.0 cards
Vista Ultimate 32-bit (although issue is similar on 64-bit Vista and 64-bit Windows XP Pro)
Thanks in advance.
