feat: power down dGPUs on hybrid graphics laptops

kernel/src/ACPI/AcpiSleep.cpp

@@ -21,6 +21,7 @@
 #include <Timekeeping/ApicTimer.hpp>
 #include <Hal/CpuPower.hpp>
 #include <Drivers/Graphics/IntelGPU.hpp>
+#include <Drivers/Graphics/DgpuPower.hpp>
 #include <Drivers/PS2/PS2Controller.hpp>
 #include <Graphics/Framebuffer.hpp>
 #include <Libraries/Memory.hpp>
@@ -128,9 +129,9 @@ namespace Hal {
                     const char* stepNames[] = {
                         "?", "GDT", "TSS", "Syscalls", "PAT", "PIC",
                         "LocalAPIC", "IoAPIC", "APICTimer", "PM1Clear",
-                        "WAK", "PS2", "IntelGPU", "sti"
+                        "WAK", "PS2", "IntelGPU", "dGPU", "sti"
                     };
-                    const char* stepName = reinitStep <= 0x0D ? stepNames[reinitStep] : "?";
+                    const char* stepName = reinitStep <= 0x0E ? stepNames[reinitStep] : "?";
                     KernelLogStream(WARNING, "S3") << "Reinit stopped after step 0x"
                         << base::hex << (uint64_t)reinitStep << " (" << stepName
                         << ") - next step crashed/hung";
@@ -459,7 +460,9 @@ namespace Hal {
             if (Drivers::Graphics::IntelGPU::IsInitialized()) {
                 Drivers::Graphics::IntelGPU::Reinitialize();
             }
-            reinitProgress(0x0D);  // sti
+            reinitProgress(0x0D);  // discrete GPU back off
+            Drivers::Graphics::DgpuPower::Resume();
+            reinitProgress(0x0E);  // sti
             asm volatile("sti");
 
             KernelLogStream(OK, "S3") << "Resumed from S3 suspend";