svc: Return random seed for svcGetInfo RandomEntropy

src/core/hle/kernel/svc.cpp

@@ -34,6 +34,7 @@
 #include "core/hle/lock.h"
 #include "core/hle/result.h"
 #include "core/hle/service/service.h"
+#include "core/settings.h"
 
 namespace Kernel {
 namespace {
@@ -558,7 +559,7 @@ static ResultCode GetInfo(u64* result, u64 info_id, u64 handle, u64 info_sub_id)
         *result = 0;
         break;
     case GetInfoType::RandomEntropy:
-        *result = 0;
+        *result = Settings::values.rng_seed.value_or(0);
         break;
     case GetInfoType::ASLRRegionBaseAddr:
         *result = vm_manager.GetASLRRegionBaseAddress();

src/yuzu/configuration/configure_system.cpp

@@ -140,7 +140,7 @@ ConfigureSystem::ConfigureSystem(QWidget* parent)
     connect(ui->rng_seed_checkbox, &QCheckBox::stateChanged, this, [this](bool checked) {
         ui->rng_seed_edit->setEnabled(checked);
         if (!checked)
-            ui->rng_seed_edit->setText("0000000000000000");
+            ui->rng_seed_edit->setText(QStringLiteral("0000000000000000"));
     });
 
     scene = new QGraphicsScene;
@@ -164,8 +164,11 @@ void ConfigureSystem::setConfiguration() {
 
     ui->rng_seed_checkbox->setChecked(Settings::values.rng_seed.has_value());
     ui->rng_seed_edit->setEnabled(Settings::values.rng_seed.has_value());
-    ui->rng_seed_edit->setText(
-        QString::fromStdString(fmt::format("{:016X}", Settings::values.rng_seed.value_or(0))));
+
+    const auto rng_seed = QString("%1")
+                              .arg(Settings::values.rng_seed.value_or(0), 16, 16, QLatin1Char{'0'})
+                              .toUpper();
+    ui->rng_seed_edit->setText(rng_seed);
 }
 
 void ConfigureSystem::PopulateUserList() {