[XP] Two Composite devices (AVStream driver) with USB SelectiveSuspend

[ricky]

Dear all,
I have an usb uvc webcam with private AVStream driver.
When I plug in it in root hub in WinXP, I send idle request irp to
selective suspend and it works.

When I plug in two same composite devices in the same hub (or root
hub), mostly PC and NB still works, but a few NB fail to enter
selective suspend mode. In fact they enter SS mode at boot time. But
when after I preview one device, then two devices never enter SS mode.
I saw two driver all send idle request irp to parent driver, but
parent driver never call them again.

Any ideas? Your comments are appreciated !

Ricky