Troubleshoot Vega Virtual Device Issues

This page provides solutions for common Vega Virtual Device (VVD) issues. If you don't find a solution to your specific problem here, post an issue in Developer Forum for additional support.

VVD won't stop on Ubuntu

Cause: Stop and status commands aren't supported for VVD on Ubuntu systems.

Solution: Right-click the VVD app icon and select close or click the "x" button in the VVD controls.

VVD crashes after launch

Cause: The following can interfere with VVD startup:

• Certain USB hubs or docking stations

• Audio interfaces (like Focusrite 2i2) when you use them for both input and output simultaneously

Solution:

For USB or docking station interference:

1. Disconnect all USB hubs from your host machine.
2. Disconnect any docking stations from your host machine.
3. Restart the VVD.

For audio interface crashes (occur 10-20 seconds after launch):

1. Use your audio interface for either input or output, but not both simultaneously.
2. Alternatively, temporarily use different devices for input and output while you run VVD.

Unable to register VVD for Amazon service

Cause: VVD requires registration before you can use any Amazon services for testing. Without completing the registration process, your app can't access Amazon services on virtual device.

Solution:

1. Click "Register this device" on the top right.
2. Record the registration code shown on screen.
3. Go to www.amazon.com/code and enter the code.

Look for this message to confirm registration:

Your device has successfully been registered

VVD crashes due to low memory

Cause: VVD may crash when running multiple resource-intensive processes (such as screen, audio, and video recording) simultaneously. High memory usage creates memory pressure, causing VVD to crash.

Solution: Check memory usage while VVD is running.

On Mac:

1. Open Activity Monitor (Applications > Utilities > Activity Monitor).
2. Click the "Memory" tab.

On Linux:

1. Open a terminal.

2. Use one of these commands:

   • top (basic system monitor)
   • htop (if installed, more user-friendly)
   • free -h (shows memory in GB/MB instead of bytes)

   Copy code Copied to clipboard.

   free -h
             total        used        free
   Mem:       16G         8.2G        4.3G
   

   Without -h, output shows bytes:

   Copy code Copied to clipboard.

   free
             total        used        free
   Mem:    16777216    8388608     4304892
   

If available memory is less than 2GB:

1. Close resource-intensive processes.
2. Close unnecessary apps.

3. Restart VVD:

   Copy code Copied to clipboard.

   kepler virtual-device start
   

VVD fails to start

Cause: You see an error about read or write permissions on /dev/kvm because virtual technology (KVM) is disabled on your Ubuntu system.

Solution: Make sure your Ubuntu image has enabled KVM virtualization technology. If you're running Ubuntu as a virtual machine, go to Settings > Processors & Memory > Advanced options and enable the hypervisor app support.

App freezes after device service crash

Cause: The VVD service crashes, causing your app to freeze and become unresponsive. The app remains frozen even after restarting services because the app connection to VVD is broken.

Solution:

1. Stop the VVD:

   Copy code Copied to clipboard.

   kepler virtual-device stop
   

2. Restart the simulator:

   Copy code Copied to clipboard.

   kepler virtual-device start
   

3. Restart the app:

   Copy code Copied to clipboard.

   kepler device launch-app [your-app-name]
   
   // Example
   kepler device launch-app com.example.mykeplerapp
   

VVD can't connect to the internet

Cause: VVD can't connect to the internet due to potential network configuration issues.

Solution: Test connectivity by opening a shell on VVD:

kepler virtual-device start

kepler device shell

ping www.amazon.com

Expected output:

3 packets transmitted, 3 received, 0% packet loss

Related topics

• Run Your App on Vega Virtual Device

Last updated: Oct 07, 2025