** Changed in: mutter (Ubuntu)
Status: Fix Committed => In Progress
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https://bugs.launchpad.net/bugs/1867757
Title:
Please pull Mutter cursor fixes for DisplayLink devices
Status in mutter package in Ubuntu:
In Progress
Bug description:
For GNOME/Wayland to use hardware cursors on DisplayLink devices
(proprietary userspace driver for USB 3 devices), the following Mutter
fixes should be included:
Mutter 3.34 branch (tentatively 3.34.5):
- https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1116 Initialize
cursor support on GPU hotplug (backport to 3.34)
Mutter 3.36 (currently master) branch (tentatively 3.36.1):
- https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1079 Handle lack of
explicit cursor planes better
- https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1097 Initialize
cursor support on GPU hotplug
Without "Initialize cursor support on GPU hotplug" performance on
hotplugged DisplayLink devices that create a new DRM device node
suffers, because Mutter uses a software cursor which implies that
DisplayLink needs to update the whole screen on every cursor motion.
Without "Handle lack of explicit cursor planes better" there will not
be a cursor at all on DisplayLink devices in Mutter 3.36.
I would assume that the 3.34 branch is relevant to Ubuntu 19.10 and
the 3.36 branch is relevant to Ubuntu 20.04.
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