https://bugs.freedesktop.org/show_bug.cgi?id=101139
--- Comment #21 from Peter Hutterer <peter.hutte...@who-t.net> ---
sigh, this is how quickly two months disappear. sorry about this, busy with a
million other things but this is on my radar again now. So: a 5 min browsing
session shows this:
# Number of data points: 12378
# Highest velocity: 5692.05937231 mm/s
# Starting with 570 buckets
# Reducing to 31 buckets (5 required per bucket)
# Left with 12359 data points (99.8% of data)
percent nevents total-percent speed
---------- --------- --------------- -------
43.2964 5351 43.2964 10
13.65 1687 56.9464 20
7.60579 940 64.5521 30
5.34833 661 69.9005 40
4.70912 582 74.6096 50
4.34501 537 78.9546 60
3.50352 433 82.4581 70
2.83194 350 85.2901 80
2.20892 273 87.499 90
2.00663 248 89.5056 100
1.87717 232 91.3828 110
1.59398 197 92.9768 120
1.27033 157 94.2471 130
1.13278 140 95.3799 140
0.962861 119 96.3427 150
0.736306 91 97.0791 160
0.687758 85 97.7668 170
0.453111 56 98.2199 180
0.38029 47 98.6002 190
0.347925 43 98.9481 200
0.226556 28 99.1747 210
0.226556 28 99.4012 220
0.250829 31 99.6521 230
0.0728214 9 99.7249 240
0.0323651 4 99.7573 250
0.0404563 5 99.7977 260
0.0323651 4 99.8301 270
0.0485476 6 99.8786 280
0.0566389 7 99.9353 290
0.0242738 3 99.9595 300
0.0404563 5 100 310
note how almost half the events are in the 10-20mm/s bucket. So I don't think
your measurement is out of the ordinary.
I realised after recording that this was with the synaptics driver. Since there
is a positive feedback loop, here's another session with libinput. I think any
differences are more due to different interactions than the two drivers.
# Number of data points: 7033
# Highest velocity: 1669.01036276 mm/s
# Starting with 167 buckets
# Reducing to 37 buckets (5 required per bucket)
# Left with 7005 data points (99.6% of data)
percent nevents total-percent speed
---------- --------- --------------- -------
37.8016 2648 37.8016 10
16.8879 1183 54.6895 20
3.88294 272 58.5724 30
2.55532 179 61.1278 40
6.8808 482 68.0086 50
4.75375 333 72.7623 60
4.0828 286 76.8451 70
2.75517 193 79.6003 80
2.18415 153 81.7844 90
2.14133 150 83.9258 100
1.68451 118 85.6103 110
1.54176 108 87.152 120
1.3419 94 88.4939 130
1.22769 86 89.7216 140
1.18487 83 90.9065 150
1.01356 71 91.9201 160
1.02784 72 92.9479 170
0.913633 64 93.8615 180
0.842256 59 94.7038 190
0.813704 57 95.5175 200
0.770878 54 96.2884 210
0.6995 49 96.9879 220
0.613847 43 97.6017 230
0.342612 24 97.9443 240
0.399714 28 98.344 250
0.28551 20 98.6296 260
0.271235 19 98.9008 270
0.256959 18 99.1577 280
0.171306 12 99.3291 290
0.157031 11 99.4861 300
0.157031 11 99.6431 310
0.0856531 6 99.7288 320
0.0713776 5 99.8001 330
0.028551 2 99.8287 340
0.028551 2 99.8572 350
0.0713776 5 99.9286 360
0.0713776 5 100 370
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