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- Start the login-screen --server as the active seat0 greeter account instead of root, so the DRM capture GPU/EGL convert never loads the vendor GPU userspace in a privileged process. A genuine root graphical session has no lower uid to drop to and stays root, and if the greeter spawn fails we fall back to a root --server so the login screen stays remotable. Gated on the drm feature so the non-drm build is unchanged. - Bound the number of frames in flight on the `_drm` channel: the consumer acks each frame it finishes converting and the producer only sends while it holds credit, waiting on the socket otherwise. Without this the producer kept writing descriptors into the socket faster than a slow convert drained them and the consumer worked through an ever-growing backlog of stale frames. A zero-byte read or write on the ack path is treated as a closed peer rather than as success. - Forward a display list that became empty (last monitor unplugged) instead of dropping it, so the availability cache leaves Available rather than keep advertising removed displays. - On a topology change, invalidate the Wayland geometry cache and reapply the uinput mouse range for the new layout. The refresh runs off the frame-receive loop and is coalesced across the per-display receivers, so a multi-monitor hotplug runs one worker and the final layout wins. - Clear the prefer-CPU-convert hints on a topology change: display indices can be renumbered, so a hint learned for an old index no longer refers to the same physical display. Re-learned on the next convert failure. - Report a non-DRM-backed display when the DRM list is shorter than the sync list or any entry is offline, covering the present-but-demoted case.