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authorChristian Krinitsin <mail@krinitsin.com>2025-05-21 21:21:26 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-05-21 21:21:26 +0200
commit4b927bc37359dec23f67d3427fc982945f24f404 (patch)
tree245449ef9146942dc7fffd0235b48b7e70a00bf2 /gitlab/issues/target_missing/host_missing/accel_missing/2231.toml
parentaa8bd79cec7bf6790ddb01d156c2ef2201abbaab (diff)
downloademulator-bug-study-4b927bc37359dec23f67d3427fc982945f24f404.tar.gz
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+id = 2231
+title = "GNOME/Mutter - Wayland Fractional Scaling Breaks VM Resolution"
+state = "opened"
+created_at = "2024-03-19T22:12:18.435Z"
+closed_at = "n/a"
+labels = ["GUI"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/2231"
+host-os = "Fedora 39"
+host-arch = "x86"
+qemu-version = "8.1.3 (qemu-8.1.3.4.fc39)"
+guest-os = "any (Tested Fedora 38,39, GNOME OS Nightly, and Windows 10,11)"
+guest-arch = "x86"
+description = """VMs are rendered at a higher resolution than the pixel count of their window, seemingly because mutter is upscaling for fractional scaling."""
+reproduce = """1. Enable GNOME Mutter experimental fractional scaling
+2. Launch VM"""
+additional = """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."""