>From the evtest.log in the comment #2, we saw lots of big coordinate value
>change, this definitely can make the cursor jumpy.
Event: time 1379494502.606841, type 2 (EV_REL), code 0 (REL_X), value -232
Event: time 1379494502.606841, type 2 (EV_REL), code 1 (REL_Y), value -24
Event: time 1379494502.606841, -------------- SYN_REPORT ------------
Event: time 1379494502.636533, type 2 (EV_REL), code 0 (REL_X), value -232
Event: time 1379494502.636533, type 2 (EV_REL), code 1 (REL_Y), value -24
Event: time 1379494502.636533, -------------- SYN_REPORT ------------
Event: time 1379494502.666019, type 2 (EV_REL), code 0 (REL_X), value -232
Event: time 1379494502.666019, type 2 (EV_REL), code 1 (REL_Y), value -24
Event: time 1379494502.666019, -------------- SYN_REPORT ------------
Event: time 1379494502.703971, type 2 (EV_REL), code 0 (REL_X), value -232
Event: time 1379494502.703971, type 2 (EV_REL), code 1 (REL_Y), value -24
Event: time 1379494502.703971, -------------- SYN_REPORT ------------
Event: time 1379494502.754022, type 2 (EV_REL), code 0 (REL_X), value -232
Event: time 1379494502.754022, type 2 (EV_REL), code 1 (REL_Y), value -24
Event: time 1379494502.754022, -------------- SYN_REPORT ------------
When i run this test on a normal machine, the change of coordinate is
very small and smooth:
u@X240s2:~/alsa-utils-0.9.4$ sudo evtest /dev/input/event12
[sudo] password for u:
Input driver version is 1.0.1
Input device ID: bus 0x11 vendor 0x2 product 0xa version 0x0
Input device name: "TPPS/2 IBM TrackPoint"
Supported events:
Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
Event code 272 (BTN_LEFT)
Event code 273 (BTN_RIGHT)
Event code 274 (BTN_MIDDLE)
Event type 2 (EV_REL)
Event code 0 (REL_X)
Event code 1 (REL_Y)
Testing ... (interrupt to exit)
Event: time 1381978204.580973, type 2 (EV_REL), code 1 (REL_Y), value 1
Event: time 1381978204.580975, -------------- SYN_REPORT ------------
Event: time 1381978204.715128, type 2 (EV_REL), code 0 (REL_X), value 1
Event: time 1381978204.715130, -------------- SYN_REPORT ------------
Event: time 1381978205.170376, type 2 (EV_REL), code 0 (REL_X), value -1
Event: time 1381978205.170379, -------------- SYN_REPORT ------------
Event: time 1381978205.195733, type 2 (EV_REL), code 0 (REL_X), value -1
Event: time 1381978205.195735, type 2 (EV_REL), code 1 (REL_Y), value -1
Event: time 1381978205.195736, -------------- SYN_REPORT ------------
Event: time 1381978205.237546, type 2 (EV_REL), code 0 (REL_X), value -1
Event: time 1381978205.237549, -------------- SYN_REPORT ------------
Event: time 1381978205.247205, type 2 (EV_REL), code 0 (REL_X), value -2
Event: time 1381978205.247207, type 2 (EV_REL), code 1 (REL_Y), value -1
Event: time 1381978205.247208, -------------- SYN_REPORT ------------
Event: time 1381978205.257781, type 2 (EV_REL), code 1 (REL_Y), value -1
Event: time 1381978205.257783, -------------- SYN_REPORT ------------
Event: time 1381978205.267328, type 2 (EV_REL), code 0 (REL_X), value -1
Event: time 1381978205.267331, -------------- SYN_REPORT ------------
Event: time 1381978205.276894, type 2 (EV_REL), code 0 (REL_X), value -2
Event: time 1381978205.276898, type 2 (EV_REL), code 1 (REL_Y), value -1
Event: time 1381978205.276899, -------------- SYN_REPORT ------------
Event: time 1381978205.283967, type 2 (EV_REL), code 0 (REL_X), value -1
Event: time 1381978205.283969, -------------- SYN_REPORT ------------
Event: time 1381978205.307252, type 2 (EV_REL), code 0 (REL_X), value -2
Event: time 1381978205.307255, type 2 (EV_REL), code 1 (REL_Y), value -1
Event: time 1381978205.307256, -------------- SYN_REPORT ------------
Event: time 1379494502.783827, type 2 (EV_REL), code 0 (REL_X), value -232
Event: time 1379494502.783827, type 2 (EV_REL), code 1 (REL_Y), value -24
Event: time 1379494502.783827, -------------- SYN_REPORT ------------
Event: time 1379494502.823308, type 2 (EV_REL), code 0 (REL_X), value -232
Event: time 1379494502.823308, type 2 (EV_REL), code 1 (REL_Y), value -24
Event: time 1379494502.823308, -------------- SYN_REPORT ------------
Event: time 1379494502.852712, type 2 (EV_REL), code 0 (REL_X), value -232
Event: time 1379494502.852712, type 2 (EV_REL), code 1 (REL_Y), value -24
Event: time 1379494502.852712, -------------- SYN_REPORT ------------
Event: time 1379494502.882358, type 2 (EV_REL), code 0 (REL_X), value -232
Event: time 1379494502.882358, type 2 (EV_REL), code 1 (REL_Y), value -24
Event: time 1379494502.882358, -------------- SYN_REPORT ------------
Event: time 1379494502.930790, type 2 (EV_REL), code 0 (REL_X), value -232
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https://bugs.launchpad.net/bugs/1226999
Title:
[Lenovo X230s] Jumpy cursor with TPPS/2 IBM Trackpoint
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