VirtualBox - Auto-resize Guest Display goes black on fullscreen

By xngo on March 28, 2021


I recently upgraded my VirtualBox from 6.0 to 6.1.18. Auto-resize Guest Display no longer works. I got a black screen if I go full screen. However, if I shrunk to lower resolution, I see the content inside my virtual machine.


I messed around Graphic Controller option but it didn't resolve the issue. Then, when I increased the Video Memory size from 16MB to 32MB, open my virtual machine to full screen work now. I don't know why it requires more memory when the latest version.

About the author

Xuan Ngo is the founder of He currently lives in Montreal, Canada. He loves to write about programming and open source subjects.