This had been discovered within bug #1547691 comment #23: Using gdm (which runs Wayland), just quickly moving mouse left-right above the grey area (where is nothing to click on) causes significant CPU usage. This is within a virtual machine. When I log in to the GNOME (Wayland), then `top` shows gnome-shell as the main CPU user when moving mouse around the desktop (where is also nothing to click on). Logging into GNOME on X.org also shows a bit higher CPU usage, but it's nothing that significant like under Wayland. Fedora 27 seems to be also affected. I do not think crazy mouse move should cause any such CPU usage, not talking that it causes high power consumption, thus less up time for the laptops on batteries.
This was concluded to be a mesa issue right?
(In reply to Jonas Ådahl from comment #1) > This was concluded to be a mesa issue right? No idea from my side.
Does it still reproduce for you?
It still reproduces on my Dell Latitude 5480 with latest gnome-shell (3.28.2). Up to 35% cpu usage when mouse moving.
For me too, in gdm screen, Fedora 28 virtual machine with: gdm-3.28.1-1.fc28.x86_64 gnome-shell-3.28.2-1.fc28.x86_64 mesa-dri-drivers-18.0.2-1.fc28.x86_64 and also rawhide virtual machine with: gdm-3.28.1-1.fc29.x86_64 gnome-shell-3.29.1-1.fc29.x86_64 mesa-dri-drivers-18.0.1-1.fc29.x86_64 I'll update rawhide to more recent versions and report back whether anything changed.
The same with: gdm-3.28.2-1.fc29.x86_64 gnome-shell-3.29.2-1.fc29.x86_64 mesa-dri-drivers-18.1.1-2.fc29.x86_64 mutter-3.29.2-2.fc29.x86_64
This bug appears to have been reported against 'rawhide' during the Fedora 29 development cycle. Changing version to '29'.
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Fedora 29 changed to end-of-life (EOL) status on 2019-11-26. Fedora 29 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.