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+id = 1550
+title = "Crazy mouse movement when passing `-M pc,vmport=off -accel kvm -vga virtio` at the same time"
+state = "opened"
+created_at = "2023-03-19T13:52:33.684Z"
+closed_at = "n/a"
+labels = ["GUI", "device:input"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/1550"
+host-os = "Arch Linux"
+host-arch = "x86"
+qemu-version = "8.0rc0"
+guest-os = "Manjaro"
+guest-arch = "x86"
+description = """The mouse cursor is unusable in an x86 guest (disappears, jumps around like crazy) in a graphical environment when `-M pc,vmport=off -accel kvm -vga virtio` is given at the same time."""
+reproduce = """1. Download https://download.manjaro.org/xfce/22.0.5/manjaro-xfce-22.0.5-230316-linux61.iso
+2. Start above command
+3. Wait until the graphical desktop appears
+4. Click inside the window and move the mouse
+
+-> Mouse cursor disappears or jumps around like crazy"""
+additional = """If vmport=off is **not** passed, at some point during startup (before graphical login manager appears) the guest switches to use vmmouse from PS/2 mouse. There it also requests usage of absolute input coordinates (VMMOUSE_REQUEST_ABSOLUTE). This code path works normal. Therefore the culprit might be in the guest.
+
+Another way to reproduce the issue is to use -accel whpx under Windows host (no need to pass vmport=off there). It can be observed that the same guest doesn't attempt to switch to vmmouse there, just like passing vmport=off under Linux.
+
+The problem does not exist on Linux host when -accel tcg is used in which case the guest doesn't attempt to switch to vmmouse."""