Win10 Quick Assist screen-share shows corrupted desktop

[Jim Avera]

If Windows 10 guest shares its screen with a remote user using the built-in "Quick Assist" utility, the other user sees a corrupted screen. Specifically, everything is slanted at a 45 degree angle (see screenshot). It looks like each horizontal row of pixels is offset slightly from the previous one.

HOST: Ubuntu linux 20.04, X-org, Intel graphics GUEST: Windows 10 64-bit

STEPS TO REPRODUCE: In some other Win10 machine (VM or real):

1. Start the "Quick Assist" app.
2. Click the "Assist another person" button at the bottom (sign in to a microsoft account if prompted) Note the "Security code" number displayed

In the Vbox VM Win10 guest:

3. Start "Quick Assist"
4. Enter the Security code in the "Code from assistant" box

RESULTS: The remote Win10 sees the VM guest's desktop in an unusably skewed form

[Jim Avera]

Screenshot on remote system showing corrupted display

[Jim Avera]

Virtualbox Version 6.1.12 r139181 (Qt5.12.8)

(wasn't offered as an option in the drop-down)

[Jim Avera]

Still reproduced using VirtualBox 7.0, either between a VM and bare-metal system or two VMs. It seems to depend on certain screen-size ratios. I suspect (not sure) that the bug occurs when the "assisting" system's screen is vertically taller than the "assisted" machine's screen.

I will attach a screenshot showing the problem with two Win10 VMs running as guests on linux host.

The overall window sizes *on the host* (from xwininfo) were:

[upper left] "assisted" : Width: 1331, Height: 529
[lower right]"assisting": Width: 1073, Height: 724 (corruption visible)

Note that the "assisted" machine (in upper left) is vertically shorter than the "assisting" machine in lower right.

I hope this helps.

[Jim Avera]

Two win10 clients showing "slanty" corruption