When you look in system profiler. All your usb ports show as internal? Does the printer and keyboard show up under usb or high speed usb? I believe you stated you already tried disabling "Legacy usb" in the bios, maybe? I've read where that helped on other MB's but havent experienced your problem on the gigabyte p35 boards. I will take a look at your dsdt later tonight.

As far as disabling things in the bios... this will not change your dsdt. The dsdt is built from the full bios ROM, which has all ports/options available wether you have them selected in bios or not. Make sure you have updated your board to the latest available bios though. I have also read that this has fixed many bugs for other users.

If you think your dsdt may be causing the problem, try building one in acpi patcher from your downloaded bios rom file, and compile it with out all the patches and devices added. If you still have the problem, then you know it is something other than dsdt.

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GA EP35-DS3P - Intel Q9550 - 2 X 2GB Dominator 1066Mhz, EVGA 8800GTS 512MB
2x320Gb SATA in Software Raid 0, 1x1.5TB for Time machine and storage (Geekbench 6293)
10.6 Retail 64bit Using DSDT for audio-889a, video-8800gts, ethernet w/TM fix, USB fix, and SATA fix.
MacBook 2,1 - 10.6 Retail
MacBook 3,1 - 10.6 Retail