macos - How do I wake from display sleep in OSX 10.7.4?

Question

In the most recent version of OSX Lion, how do you wake up the machine from display sleep? This is in response to network activity.

In 10.7.3 this was possible with the following call:

IOPMAssertionID id = 0;
IOPMAssertionCreateWithName(kIOPMAssertionTypeNoDisplaySleep,
                            kIOPMAssertionLevelOn, reason, &id)

However, this does not work in 10.7.4. What can be done instead?

Answer 1

I have not yet tested the performance implications nor the interaction with the idle timer itself, but:

io_registry_entry_t regEntry = IORegistryEntryFromPath(kIOMasterPortDefault, "IOService:/IOResources/IODisplayWrangler");
if (regEntry != MACH_PORT_NULL) {
        IORegistryEntrySetCFProperty(regEntry, CFSTR("IORequestIdle"), kCFBooleanFalse);
        IOObjectRelease(regEntry);
}

works in 10.7.4 to wake the screen from idle.