VirtioDriver:
- Override poll_hotplug() — refresh connectors and detect
display changes by comparing cached vs current topology
- Override set_property() — validate obj_id is a known CRTC
or connector; compositors need property acknowledgement
even if individual properties are no-ops for virtio-gpu
scheme.rs:
- Fix fsync() — was EOPNOTSUPP, now returns Ok(())
Virtio-gpu commands complete synchronously, so there
are no pending GPU operations to flush
vasilito
c5646b721f