SOLVED
setting a boot option: i8042.nomux
1) sudo gedit /etc/default/grub
2) change the line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to the following
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i8042.nomux"
3) save
4) sudo update-grub
5) restart the system
I don't know what does this do, but it works. It came to me with the
solution to another Acer bug (about brightness).
Hope it will help you.
--
Acer Aspire 5738G: touchpad can be switched off, but not on again
https://bugs.launchpad.net/bugs/374459
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