Standby - Wake up

[Franz Leu]

Hi,

I have two questions related Standby and waking up:

1. Is there a way I can disable 'wake-up on USB action' on a post-FBA system
directly in registry?
The system does not have the device manager installed and unfortunately
wakes up from standby if someone touches the Touchscreen (using
USB-controller) or taps on the UBS-Keyboard.

We control the device, including standby modes, over a special application
using serial communication. Unfortunately, serial communication seems not be
seen as 'activity on the system' by the OS and after standby-timeout it
changes to standby. Of course, it does wake up again with the next serial
command since we have set COM-port IRQ's as wake-up events. However, this
always results in dark screen / out of sync LCD in periods of the set
standby-timeout for some seconds. So, my second question is:

2. Is there a way I can tell the system to accept traffic on the serial
ports as system activity and inhibit changing to standbywhile communication
is active?

Thanks for your help
Franz

 

[Franz Leu]

No ideas .... doesn't matter anymore

Found the solution:
Look for the device you wish to disable under the following keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\HID
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB
If you have found your device drill down the sub device It's (usually 2
levels) until you find 'Device Parameter' for the device.
Add a new REG_DWORD 'WaitWakeEnabled' with the value of 0 just below
'DeviceParameter'.
Reboot and that's it.

Setting back to 1 enables USB wake for the device and vice versa.
By default the key is not there and Windows uses the value of 1.

Franz