On Thu, 29 Jul 2021 12:57:03 -0000, Jorge Fernandez Monteagudo said:

> Event: time 1627381396.770902, type 4 (EV_MSC), code 5 (MSC_TIMESTAMP), value 35023100
> Event: time 1627381396.770902, -------------- SYN_REPORT ------------
> Event: time 1627381396.780891, type 4 (EV_MSC), code 5 (MSC_TIMESTAMP), value 35029400
> Event: time 1627381396.780891, -------------- SYN_REPORT ------------
> Event: time 1627381396.789895, type 4 (EV_MSC), code 5 (MSC_TIMESTAMP), value 35035700
> Event: time 1627381396.789895, -------------- SYN_REPORT ------------
> Event: time 1627381396.798896, type 4 (EV_MSC), code 5 (MSC_TIMESTAMP), value 35041900
> Event: time 1627381396.798896, -------------- SYN_REPORT ------------
> Event: time 1627381396.807889, type 4 (EV_MSC), code 5 (MSC_TIMESTAMP), value 35048200

Looks like somebody's got a timer that pops every 0.01 seconds  or so. 
(looks closer to 0.0098 or so actually)

'git grep SYN_REPORT' tells me that these two files are a good place to start reading:
Documentation/input/multi-touch-protocol.rst 
Documentation/input/event-codes.rst