Comment 4 for bug 754000

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Daniel van Vugt (vanvugt) wrote : Re: 3 finger touch interferes with 3 finger click (middle click)

Interesting to see the button events using the command "xinput test bcm5974"... With Unity loaded the middle click (three fingers) is reported incorrectly as button #1 being pressed and released. Without Unity, xinput correctly reports the middle click as button #2.

Also note that without Unity in Ubuntu Classic (not effects), I can reintroduce the bug by running "geistest" at the same time as the above xinput test (in different windows). So it would seem that libutouch-geis might be close the cause.