Comment 10 for bug 1746740

Just tried : neither this issue with Trusty K4.4.0-112 nor K4.15.1 real installs.
Only met it with Bionic-dev-Live-K4. I also tried the Live USB with acpi_osi=Linux as seen (but not mandatory) in my usual /etc/default/grub, with no difference : touchpad cursor still laggy, often locks for a while. I noticed that when the touchpad is glued in position on the screen, it is still responsive on right and bottom sides, although the option ~scroll on sides~ is disabled by default in Devices settings. Changing the option as no effect, neither as disabling default enabled 2-Fingers-Scroll.
An other strange issue I met with the Live USB : when I reboot from Live, I can't go back in Live with my BIOS F12 Select boot drive: even when I select USB Live, then the usual grub menu is displayed. I have to completely shutdown
the laptop so that USB boot selection works, when this is not the case when I reboot from usual installed Trusty.
I ran these tests with a new Bionic USB stick created from a Live Bionic session, itself running from the first Bionic key (that was created from an real Xenial install on another machine).