remote display fixes

QemuVmManager.Console/Program.cs

@@ -129,6 +129,10 @@ class Program
                                 case "port":
                 await HandlePortCommandsAsync(arguments);
                 break;
+                
+            case "config":
+                await HandleConfigCommandsAsync(vmService, arguments);
+                break;
                     case "exit":
                     case "quit":
                         System.Console.WriteLine("Goodbye!");
@@ -1275,6 +1279,91 @@ class Program
         portForwards.Add(portForward);
         await SavePortForwardsAsync(portForwards);
     }
+    
+    static async Task HandleConfigCommandsAsync(VmManagementService vmService, string[] arguments)
+    {
+        if (arguments.Length < 3)
+        {
+            System.Console.WriteLine("Usage: config <vm-name> <setting> <value>");
+            System.Console.WriteLine("Settings:");
+            System.Console.WriteLine("  display <type> [port] - Set display type (gtk, vnc, spice)");
+            System.Console.WriteLine("  vga <type>           - Set VGA type (std, virtio, qxl)");
+            System.Console.WriteLine("  memory <size>        - Set memory size in GB");
+            System.Console.WriteLine("  cpu <cores>          - Set CPU cores");
+            System.Console.WriteLine("Examples:");
+            System.Console.WriteLine("  config ubuntu-desktop display vnc 5900");
+            System.Console.WriteLine("  config ubuntu-desktop display gtk");
+            System.Console.WriteLine("  config ubuntu-desktop vga std");
+            return;
+        }
+
+        var vmName = arguments[0];
+        var setting = arguments[1].ToLower();
+        var value = arguments[2];
+
+        var config = vmService.GetVmConfiguration(vmName);
+        if (config == null)
+        {
+            System.Console.WriteLine($"VM '{vmName}' not found.");
+            return;
+        }
+
+        try
+        {
+            switch (setting)
+            {
+                case "display":
+                    config.Display.Type = value;
+                    if (arguments.Length > 3 && value == "vnc")
+                    {
+                        config.Display.SpicePort = int.Parse(arguments[3]);
+                    }
+                    System.Console.WriteLine($"Display type set to '{value}' for VM '{vmName}'");
+                    break;
+                    
+                case "vga":
+                    config.Display.Vga = value;
+                    System.Console.WriteLine($"VGA type set to '{value}' for VM '{vmName}'");
+                    break;
+                    
+                case "memory":
+                    if (int.TryParse(value, out int memorySize))
+                    {
+                        config.Memory.Size = memorySize;
+                        System.Console.WriteLine($"Memory set to {memorySize}GB for VM '{vmName}'");
+                    }
+                    else
+                    {
+                        System.Console.WriteLine("Invalid memory size. Please specify a number.");
+                    }
+                    break;
+                    
+                case "cpu":
+                    if (int.TryParse(value, out int cpuCores))
+                    {
+                        config.Cpu.Cores = cpuCores;
+                        System.Console.WriteLine($"CPU cores set to {cpuCores} for VM '{vmName}'");
+                    }
+                    else
+                    {
+                        System.Console.WriteLine("Invalid CPU cores. Please specify a number.");
+                    }
+                    break;
+                    
+                default:
+                    System.Console.WriteLine($"Unknown setting '{setting}'");
+                    break;
+            }
+
+            // Save the updated configuration
+            await vmService.UpdateVmConfigurationAsync(vmName, config);
+            System.Console.WriteLine($"Configuration updated successfully for VM '{vmName}'");
+        }
+        catch (Exception ex)
+        {
+            System.Console.WriteLine($"Error updating configuration: {ex.Message}");
+        }
+    }
 }
 
 public class PortForward

QemuVmManager.Core/QemuCommandBuilder.cs

@@ -324,8 +324,22 @@ public class QemuCommandBuilder
         
         _arguments.Add(displayType);
         
+        // 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)
         {