Omnii XT15 WM6.5 suspend timeout

Hello,

 

is there a setup available to extend the timeout for suspending the device greater than 5 minutes?

 

HKLM\System\CurrentControlSet\Control\Power\Timeouts

BattSuspendTimeout=1800

 

does not work. After 5 minutes the device goes to sleep.

 

Regards,

Uwe