Please install a QEF on 2007M6.
This QFE contains a EHCI driver pactch.
There is a registry "IntThreshCtrl=dword:8" for setting USB interrupt thread interval.
The unit is microframe(125us).
Ralink suggest you can change this value to improvemt USB EHCI driver response time.
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\PCI\Template\EHCI]
"IntThreshCtrl"=dword:1 ; 1~8 microframe ( 1 microframe = 125us)
