HiDPI scaling affects virtual display's resolution

Submitted by Zoltán

Assigned to Spice Bug List

Link to original bug (#101826)

Description

When I use Gnome's window scaling, the virtual display's image is scaled up too. This results in a blurry image on spice-based renderers.

Starting a client (virt-manager or virt-viewer) with the GDK_SCALE=1 environment variable fixes the size of the rendered image, but will result in smaller size for GUI elements, compared to other applications.

See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=868687 for further details.