Comment 19 for bug 1506817

Final report:

1) I have removed my hacks to the mouse config setup and rebooted several kernels. The kernel used by 15.04
is buggy and does not properly support
      MatchProduct "PS/2 Synaptics TouchPad"
and
      Option "Emulate3Buttons" "0"

The buttons work properly with earlier kernels
3.19.0-42-generic
and later kernels
4.5.0-040500rc3-generic
but not with
4.2.0-30-generic

To fully work, it was necessary to upgrade the BIOS (described earlier in this bug report) and then turn off the
synaptics TouchPad in the bios setup.

If the touchpad is left on (in the BIOS), then the mouse jumps around every now and then, when the palm of my right hand
touched the touchpad.
The software suppression of the touch-pad was not sufficient to keep the mouse from randoming leaving focus of the window I was typing in. For example, I would be responding to an email and the focus would be lost at random times, because my palm would touch the synaptics touch-pad. This rendered the touchpad unuseable.
Hence I found it necessary to turn it off, in the BIOS

Summary: With the early 3.19 and later 4.5 kernels, the mouse button sticking problem is resolved, but with the 4.2 kernel,
it is sticking on, when pressed, at random times. This renders the computer unuseable for daily work.

Thus the problem seems to be solved with the 4.5 kernels (and with the older kernel, with the further requirement I turn off
the touchpad in the BIOS.