Sway has some debugging options available via the -D command-line flag.
-D noatomic: disables atomic transactions-D txn-wait: forces all atomic transactions to time out-D txn-timings: logs addition information about transaction timings-D txn-timeout=<ms>: overrides the default atomic transaction timeout-D legacy-wl-drm: enables the legacy wl_drm protocol extension (Sway 1.10 and later)
Also see enable_debug_flag().
On Sway ≤ 1.9, the following flags are also supported:
-D damage=highlight: paints regions that haven't been updated in yellow (replaced by WLR_SCENE_DEBUG_DAMAGE=highlight on Sway 1.10)-D damage=rerender: disables damage tracking by forcing the whole output to be repainted each frame (replaced by WLR_SCENE_DEBUG_DAMAGE=rerender on Sway 1.10)-D noscanout: disables direct scan-out (replaced by WLR_SCENE_DISABLE_DIRECT_SCANOUT=1 on Sway 1.10)
