[maemo-developers] [maemo-developers] How to determine if the screen has turned off?

[From: Frantisek Dufka]

Johan Bilien wrote:
> 
> http://maemo.org/platform/docs/api/libosso/html/index.html
> 
> You can register a callback with osso_hw_set_event_cb, set the
> system_inactivity_ind flag in the osso_hw_state_t argument.
>

Will this callback be called even without processing gtk/glib loop?
If not is there other way how to check for blanked display e.g. from SDL 
app? How SDL games shipped with device do that?

Frantisek