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+id = 2948
+title = "-display sdl causes mice with relative movement to read garbage offsets"
+state = "opened"
+created_at = "2025-05-05T17:34:44.318Z"
+closed_at = "n/a"
+labels = []
+url = "https://gitlab.com/qemu-project/qemu/-/issues/2948"
+host-os = "Arch Linux"
+host-arch = "x86_64"
+qemu-version = "10.0.0"
+guest-os = "Arch Linux"
+guest-arch = "x86_64"
+description = """`-device virtio-mouse` and `-device usb-mouse` (and probably other mice which send relative mouse movement data) are behaving incorrectly under linux guest and jitter a lot. In this specific case it only seems to happen with `-display sdl` as I could not reproduce this same issue with other of the following configurations: `-display gtk` and `-display spice-app` running with virt-viewer.
+This behavior is not present when running a Windows guest with the same configuration using `-display sdl`
+
+Another weird side note: this behavior is less apparent when running `evtest` on the exact mouse device having issues.
+
+![Video_2025-05-05_20-11-56](/uploads/589d74106d2e9bb5713234de451f5326/Video_2025-05-05_20-11-56.mp4)"""
+reproduce = """1. Install guest operating system
+2. Install gnome metapackage and enable GDM
+3. Reboot
+4. The mouse shows jittery motion on the GDM screen."""
+additional = "n/a"