Hardware cursor is not used with virtio-gpu in QEMU virtual machine

[lilydjwg]

I discovered this with niri and reproduced with anvil. The error is "no free plane found" and the cursor plane is not used. wlroots-based compositors and kwin all work.

The issue I opned at niri: niri-wm/niri#3904

drm_info.log

Trace log from anvil: anvil.log.gz

[lilydjwg]

cosmic-comp also doesn't use hardware cursor.