GPS power management on windows ce

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WinMobile

Mobile

hello to every body
I`m developing a program that get the GPS data and i used the GPS library of Microsoft.
My problem is when the device into the sleep mode, the GPS device get the same position for 7 minute and then does not get any position,
for solve this i used this code :

CoreDLL.PowerPolicyNotify(PPNMessage.PPN_UNATTENDEDMODE, -1);
 const int POWER_NAME = 0x00000000;
 int notify = CoreDLL.DevicePowerNotify(GpsDeviceName, CEDEVICE_POWER_STATE.D0, POWER_NAME);
 IntPtr power = CoreDLL.SetDevicePower(GpsDeviceName, DevicePowerFlags.POWER_NAME, CEDEVICE_POWER_STATE.D0);

and this code:

<br />
CEDEVICE_POWER_STATE state = CEDEVICE_POWER_STATE.D0;<br />
 CoreDLL.GetDevicePower(GpsDeviceName, DevicePowerFlags.POWER_NAME, out state);<br />
 CoreDLL.SetPowerRequirement(GpsDeviceName, CEDEVICE_POWER_STATE.D0,<br />
              DevicePowerFlags.POWER_NAME | DevicePowerFlags.POWER_FORCE,<br />
              IntPtr.Zero, 0);<br />
 <br />

but this work in HTC touch2 and acer E101,s200 and Xperia and .....
but doesn`t work on HTC HD2,,,,
What can i do??


Please Help..
Thanks