3D Acceleration and Unscaled HiDPI Output bug

[sjchoi]

I have three problems.

[1] "Enabling 3D Acceleration" causes screen detach.

See "3D Acc.png". Steps to reproduce:

1) Install a Windows 10 guest on a Mac host. 2) Enabling 3D Acceleration in Settings > Display > Screen. 3) Boot the Windows guest.

[2] "Enable 3D Acceleration" and "Use Unscaled HiDPI Output" causes screen detach and distortion.

See "3D Acc & Unscaled HiDPI.png". Steps to reproduce:

1) Install a Windows 10 guest on a Mac host. 2) Enabling 3D Acceleration and Use Unscaled HiDPI Output in Settings > Display > Screen. 3) Boot the Windows guest.

[3] Using Unscaled HiDPI Output in Integrated Graphics is very slow.

Steps to reproduce:

1) Install a Windows 10 guest on a Mac host. 2) Use Unscaled HiDPI Output in Settings > Display > Screen. 3) Uncheck 3D Acc to use Internal Graphics. 4) Boot the Windows guest. 5) Set "Custom Scaling" to 200% in Settings > System > Display > Scale and layout in Windows. 6) Log out and in to apply.

In this state, the virtual machine is very slow and laggy. Can there be any optimizations so that I can use a retina Win 10 guest without any lag?

7) It goes well if disable "Custom Scaling" in the guest and set "VirtualBoxVM.app" as "Open in Low Resolution" in the host. See "Low Res.png".

* Info * Host Device

MacBook Pro (15-inch, 2017) aka MacBookPro14,3

Host GPU

Radeon Pro 560 4 GB Intel HD Graphics 630 1536 MB

Host OS

High Sierra 10.13.2 (17C88)

Guest Additions and VirtualBox Extension Pack installed

[sjchoi]

Go to Ticket #17369. Attatchments are not uploaded.