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authorChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:07 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:17 +0200
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+GNOME/Mutter - Wayland Fractional Scaling Breaks VM Resolution
+Description of problem:
+VMs are rendered at a higher resolution than the pixel count of their window, seemingly because mutter is upscaling for fractional scaling.
+Steps to reproduce:
+1. Enable GNOME Mutter experimental fractional scaling
+2. Launch VM
+Additional information:
+This only occurs when wayland fractional scaling is enabled, not when text is scaled. Since GNOME/mutter accomplishes fractional scaling by upscaling, I think the VM is being told its window has a higher resolution than it actually has, so it is rendering the VM at a higher resolution, which is then displayed at the display's real resolution.
+
+In the screenshot below, my resolution is 2256 x 1504 and I have set fractional scaling to 125%. It is worth noting (2256 / 1.25) / 3606 is approximately 0.5.
+
+![image](/uploads/0014f068f6491175c00449093c40cd8c/image.png)
+
+I apologize if the report is unsatisfactory. I will provide more detail if instructed. I tried reporting to GNOME Boxes and Virt-manager, which both use QEMU, but it seems the problem is upstream.