Frame timings debug output reports idle periods as "jitter"
The following discussion from !3082 (merged) should be addressed:
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@daenzer started a discussion: (+3 comments) One issue with this is that it counts unused display refresh cycles as "jitter":
Jun 22 19:02:12 thor gnome-shell[3943]: [ +476913]:[FRAME_TIMINGS]: update2dispatch 18 µs Jun 22 19:02:12 thor gnome-shell[3943]: [ +577228]:[FRAME_TIMINGS]: dispatch jitter 93449µs (560%) Jun 22 19:02:12 thor gnome-shell[3943]: [ +593083]:[FRAME_TIMINGS]: update2dispatch 824 µs Jun 22 19:02:12 thor gnome-shell[3943]: [ +593155]:[FRAME_TIMINGS]: dispatch jitter 97904µs (586%)