remote display fixes

QemuVmManager.Core/QemuCommandBuilder.cs

@@ -324,8 +324,22 @@ public class QemuCommandBuilder
         
         _arguments.Add(displayType);
         
-        _arguments.Add("-vga");
-        _arguments.Add(display.Vga);
+        // For X11 forwarding compatibility, use std VGA instead of virtio
+        // This avoids GLX/OpenGL issues when forwarding over X11
+        if (displayType == "gtk" || displayType == "x11")
+        {
+            _arguments.Add("-vga");
+            _arguments.Add("std"); // Use standard VGA for better X11 compatibility
+            
+            // Add software rendering options to avoid GLX issues
+            _arguments.Add("-device");
+            _arguments.Add("virtio-gpu-pci,edid=off"); // Use virtio-gpu without EDID
+        }
+        else
+        {
+            _arguments.Add("-vga");
+            _arguments.Add(display.Vga);
+        }
         
         if (display.EnableSpice)
         {