search for: drm_accurate_vblank_count

...microseconds earlier, the flip completion event will either contain correct count/timestamp or a stale count/timestamp from the previous vblank. This error was observed for about 50% of all executed flips, e.g., observable under DRI2 by the Xorg.log filling with flip handler warning messages. Call drm_accurate_vblank_count() before sending out flip completion events to enforce a vblank count/ts update for the vblank of flip completion and avoid stale counts/timestamps. This fix leads to one redundant call to drm_update_vblank_count for each completed flip, but no other side effects. On a ~6 year old Core i7 M620@ 2....