@leh: "Hi,
I have a USB composite device with HID and audio class interfaces (its 
basically a USB headset). It uses Microsoft drivers only.
When trying to standby the system with remote wakeup enabled, the system 
hangs while the "preparing to stand by" dialog is shown.
The same problem occurs with a Plantronics DSP-500 headset.
The following message is printed in WinDbg when standby is attempted:
fyi: \Driver\usbccgp \Device\00000097 irp (83083008) QueryPower-Sleeping3 
status c0000001
If I change the USB descriptors so only the HID device is exposed (i.e. its 
no longer a composite device), standby/resume works as expected.
WinDbg now shows the following message instead:
fyi: \Driver\HidUsb \Device\_HID00000000 irp (831d3e70) QueryPower-Sleeping3 
status c0000001
IMHO this is a bug in usbccgp  and/or hidusb.
Test system is XP with SP2.
Leo Havm�ller. "
    @rtxleh: "Hi,
I have a USB composite device with HID and audio class interfaces (its
basically a USB headset). It uses Microsoft drivers only.
When trying to standby the system with remote wakeup enabled, the system
hangs while the "preparing to stand by" dialog is shown.
The same problem occurs with a Plantronics DSP-500 headset.
The following message is printed in WinDbg when standby is attempted:
fyi: \Driver\usbccgp \Device\00000097 irp (83083008) QueryPower-Sleeping3
status c0000001
If I change the USB descriptors so only the HID device is exposed (i.e. its
no longer a composite device), standby/resume works as expected.
WinDbg now shows the following message instead:
fyi: \Driver\HidUsb \Device\_HID00000000 irp (831d3e70) QueryPower-Sleeping3
status c0000001
IMHO this is a bug in usbccgp  and/or hidusb.
Test system is XP with SP2.
Leo Havm�ller."
    @rtxleh: "<quote>
I thought you had access to email addresses from the managed newsgroup 
registration and MSDN subscription info.
Nevertheless, here it is: <email_address>
It should be obvious what part of it to remove.
Leo Havm�ller. "
    @rtxleh: ""Leo Havm�ller" <email_address> wrote in message 
news:<email_address>
<quote>
I finally had some time to test on another PC.
Installed XP from scratch, tried with SP1a and SP2, tried plugging the 
device as USB 1.1 and also with a USB 2.0 hub, all combinations show the 
dialog "The device driver for the 'USB Composite Device' device is 
preventing the machine from entering standby."
Can this message help locating the problem?
Leo Havm�ller. "
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