Frequent freezes in display output since 6.0

[cremor]

Since I updated from 5.2.x to 6.0.x I have problems with my Windows 10 guest. The problems manifest as freezes/pauses/hangs in the UI. The whole display output freezes and a bit later suddenly jumps to the desired output. This is especially visible in continuus animations, but annoying everywhere, especially while typing text.

This happens at least with:

• VBoxVGA without 3D acceleration
• VBoxSVGA without 3D acceleration
• VBoxSVGA with 3D acceleration

I didn't test VMSVGA. 2D-video acceleration settings don't seem to have an effect on the problem.

When I downgrade to 5.2.x (last I tried was 5.2.22) the problem is gone.

With 6.0.2 and 6.0.4 it was very easy to reproduce the problem, nearly every start of the guest showed it. With later versions (6.0.10 and especially 6.0.12) it got better (harder to reproduce). Now the problem only shows up every ~10 starts of the guest.

To get or "fix" the problem it is not enough to do a restart of the guest. A full shutdown and cold start is requried. Additionally the problem can also start when you resume the guest from a saved state. But it seems like a resume can not "fix" it.

More information and multiple log files from older VirtualBox versions can be found in the forums: ​https://forums.virtualbox.org/viewtopic.php?f=2&t=91836

Configuration details:

• VirtualBox 6.0.12 (I could also reproduce it with 6.0.2, 6.0.4 and 6.0.10)
• No extension pack installed
• Guest Additions 6.0.12
• Host OS: Windows 10 x64 1809 (I could also reproduce it with 1803)
• GPU: Intel HD Graphics 530 with driver 26.20.100.6912 (I could also reproduce it with 25.20.100.6519)
• 2 monitors with 1920x1080 resolution (I could also reproduce it with just 1 monitor)
• All monitors (both host and VM) at 100% scaling
• Guest OS: Windows 10 x64 1809 (I could also reproduce it with 1709)
• Guest is running in full screen mode
• Guest settings:
  • 3 of 4 CPU cores (I could also reproduce it with just 2 cores assigned)
  • 10 of 16 GB RAM
  • VRAM at maximum (128/256 MB)
  • All other settings are at their default for a Windows 10 x64 VM

[cremor]

Here the problem startet after a resume from a saved state

[Emerzon]

Similar issue here with Linux as a Guest, Windows as Host. Also using Intel 530 Graphics.

[cremor]

That's interesting. I would have thought that the problem is Windows specific, but seems like it isn't. Could an admin please change the guest type in the ticket to reflect this?

Emerzon, are you using the VMSVGA graphics adapter?

I've also got some news: I still have the problem with VirtualBox version 6.1.2, at least with VBoxSVGA and 3D disabled (will test other settings later). I'll attach the log file.

[cremor]

VirtualBox 6.1.2 with VBoxVGA and 3D disabled also still has the same problem. I'll attach the logs.

[forumber]

I got exactly the same problem since the version 6.0. VBoxVGA with WDDM is bearable (not smooth but at least there is no frequent freezes) but VBoxSVGA with WDDM is not bearable.