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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
commitdee4dcba78baf712cab403d47d9db319ab7f95d6 (patch)
tree418478faf06786701a56268672f73d6b0b4eb239 /results/classifier/deepseek-r1:14b/output/hypervisor/1550
parent4d9e26c0333abd39bdbd039dcdb30ed429c475ba (diff)
downloademulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.tar.gz
emulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.zip
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+Crazy mouse movement when passing `-M pc,vmport=off -accel kvm -vga virtio` at the same time
+Description of problem:
+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.
+Steps to 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 information:
+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.