Stabilize live ISO consoles and NVIDIA boot path

iso/builder/smoketest.sh

@@ -53,17 +53,23 @@ else
     fail "NVIDIA ko dir missing: $KO_DIR"
 fi
 
-for mod in nvidia nvidia_modeset nvidia_uvm; do
+if /sbin/lsmod 2>/dev/null | grep -q "^nvidia "; then
+    ok "module loaded: nvidia"
+else
+    fail "module NOT loaded: nvidia"
+fi
+
+for mod in nvidia_modeset nvidia_uvm; do
     if /sbin/lsmod 2>/dev/null | grep -q "^$mod "; then
         ok "module loaded: $mod"
     else
-        fail "module NOT loaded: $mod"
+        warn "module not loaded at boot: $mod"
     fi
 done
 
 echo ""
 echo "-- NVIDIA device nodes --"
-for dev in nvidiactl nvidia0 nvidia-uvm; do
+for dev in nvidiactl nvidia0; do
     if [ -e "/dev/$dev" ]; then
         ok "/dev/$dev exists"
     else
@@ -71,6 +77,12 @@ for dev in nvidiactl nvidia0 nvidia-uvm; do
     fi
 done
 
+if [ -e /dev/nvidia-uvm ]; then
+    ok "/dev/nvidia-uvm exists"
+else
+    warn "/dev/nvidia-uvm missing — CUDA stress path may be unavailable until loaded on demand"
+fi
+
 echo ""
 echo "-- nvidia-smi --"
 if PATH="/usr/local/bin:$PATH" command -v nvidia-smi >/dev/null 2>&1; then