ubuntu-x-swat team mailing list archive

[Jason Conti <873482@xxxxxxxxxxxxxxxxxx>]

After further investigation, the reason why triple tap works with the
natty kernel and not the oneiric kernel is that has_touch in xserver-
xorg-input-synaptics/src/eventcomm.c is set to false with the natty
kernel (probably do to the lack of semi multi-touch data), so the
active_touches code from patches 120 and 121 is skipped and the
BTN_TOOL_TRIPLETAP data from the kernel is used instead.

With the oneiric kernel, double tap works correctly because the
coordinate for each finger is reported separately, so active_touches is
incremented once for each slot, but the elantech driver reports triple
taps the same as single taps, so active_touches is only incremented
once.

I don't really know how to fix this without possibly breaking something
else.

As an aside, I did find a bug in detecting semi mt devices
(unfortunately, it doesn't help at all). When initializing
ecpriv->semi_mt in eventcomm.c, the code reads the props and then does:

proc & INPUT_PROP_SEMI_MT

to test if the device is a semi mt device. However, INPUT_PROP_SEMI_MT =
0x03, it specifies the bit position, not the bit itself, so something
like:

proc & (1 << INPUT_PROP_SEMI_MT)

is probably needed here (or a suitable macro that does something
similar).

-- 
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https://bugs.launchpad.net/bugs/873482

Title:
  elantech: Touchpad always reports 3 finger tap as 1 finger tap

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