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Set backlight to hard coded intensity on wakeup (and set repeatedly) for macOS High Sierra #1

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Set backlight to hard coded intensity on wakeup (and set repeatedly) for macOS High Sierra #1

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25 changes: 24 additions & 1 deletion AMDGPUWakeHandler/AMDGPUWakeHandler.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -64,17 +64,40 @@ void AMDGPUWakeHandler::stop(IOService *provider)
void AMDGPUWakeHandler::disableGPU()
{
IOLog("Disabling GPU\n");
// GMUX_PORT_SWITCH_DDC - 1=IGD, 2=DIS
outb(0x728, 0x1);
// GMUX_PORT_SWITCH_DISPLAY - 2=IGD, 3=DIS
outb(0x710, 0x2);
// GMUX_PORT_SWITCH_EXTERNAL - 2=IGD, 3=DIS
outb(0x740, 0x2);
// GMUX_PORT_DISCRETE_POWER - 0-3?
outb(0x750, 0x0);
}

void AMDGPUWakeHandler::setBacklight(uint32_t Intensity)
{
IOLog("Setting backlight to %u\n", Intensity);
// Write to GMUX_PORT_BRIGHTNESS -> GMUX_PORT_BRIGHTNESS+3
outb(0x774, Intensity & 0xff);
outb(0x775, (Intensity >> 8) & 0xff);
outb(0x776, (Intensity >> 16) & 0xff);
outb(0x777, (Intensity >> 24) & 0xff);
}

// Wakeup backlight intensity
#define BacklightIntensity 120000

IOReturn AMDGPUWakeHandler::setPowerState ( unsigned long whichState, IOService * whatDevice )
{
if ( kIOPMPowerOff != whichState ) {
IOLog("Waking up\n");
this->disableGPU();
// Disable GPU and set backlight several times after wakeup to make sure it sticks
// (and we aren't overruled by another driver?)
for(int i = 0; i < 20; i++){
this->disableGPU();
this->setBacklight(BacklightIntensity);
IOSleep(500);
}
}
return kIOPMAckImplied;
}
1 change: 1 addition & 0 deletions AMDGPUWakeHandler/AMDGPUWakeHandler.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -13,4 +13,5 @@ class AMDGPUWakeHandler : public IOService
virtual IOReturn setPowerState(unsigned long whichState, IOService * whatDevice);
private:
virtual void disableGPU();
virtual void setBacklight(uint32_t Intensity);
};