Prevent Sleep Mode

  • Thread starter Thread starter dav.olivares
  • Start date Start date
D

dav.olivares

I've an application that has to be running always. I've a problem when
sleep mode activates. I've tried different ways without success in a
Symbol MC35 (WM5 and CF2)

1. SystemIdleTimerReset in time intervals doesn't work.
2. I've modified the registry entries:

ControlPanel\BackLight DimACTimeout and DimBatteryTimeout.
System\CurrentControlSet\Control\Power\Timeouts ACSuspendTimeout and
BattSuspendTimeout

but changes doesn't take effect, I've tried to send a message to
reload the values without success:

SendMessage(hwnd_broadcast, wm_settingchange, 0, "System
\CurrentControlSet\Control\Power\Timeouts")
SendMessage(hwnd_broadcast, wm_settingchange, 0,
"ControlPanel\BackLight")

Dou you have any idea about to solve that?

Thank you
 
SystemIdleTimerReset() should absolutely prevent the system from ever
thinking that it's idle. I don't think that it can 'fail'. Perhaps your
code that calls it is not being called frequently enough to head off the
suspend?

Paul T.
 
Thank you Paul,

yes, it was the first to try but it doesn't work.
I've tried handle = SetPowerRequirement("BKL1:",
PowerState.D0, 1, IntPtr.Zero, 0)
but it works only when it's cable connected but not if it's only by
battery.
 
You lost me big time there. What does calling SetPowerRequirement() have to
do with anything? I've tested SystemIdleTimerReset() in all configurations
of a couple of versions of Windows CE and it operates exactly the way you'd
expect it to. Of course, if you're on A/C power, then the time-out will
occur at the A/C power setting from the registry that was set when the
system started up and, when on battery, the battery time-out.

Paul T.

Thank you Paul,

yes, it was the first to try but it doesn't work.
I've tried handle = SetPowerRequirement("BKL1:",
PowerState.D0, 1, IntPtr.Zero, 0)
but it works only when it's cable connected but not if it's only by
battery.
 
I've an application that has to be running always. I've a problem when
sleep mode activates. I've tried different ways without success in a
Symbol MC35 (WM5 and CF2)

1. SystemIdleTimerReset in time intervals doesn't work.
2. I've modified the registry entries:

ControlPanel\BackLight   DimACTimeout and DimBatteryTimeout.
System\CurrentControlSet\Control\Power\Timeouts  ACSuspendTimeout and
BattSuspendTimeout

but changes doesn't take effect, I've tried to send a message to
reload the values without success:

            SendMessage(hwnd_broadcast, wm_settingchange, 0, "System
\CurrentControlSet\Control\Power\Timeouts")
            SendMessage(hwnd_broadcast, wm_settingchange, 0,
"ControlPanel\BackLight")

Dou you have any idea about to solve that?

Thank you
Click to expand...

Try checking out on Settings->System->Power->Advanced "Turn off device
if not used for n minutes".
That should work for you.
 
After many test and making reset to the device SystemIdleTimerReset
works.

Thanks to all.
 
Back
Top