Public bug reported:
My notebook (Lenovo Yoga S1) has a capacitive touch screen as well as an
inductive screen for styluses. When I rest my palm on the screen and
then hover my stylus above the screen so that the stylus is recognized
and the mouse pointer follows it, and then move the stylus around Gnome
seems to freeze for some seconds. The duration of the freeze is
proportional to the time the notebook received simultaneous input from
the two methods.
"Freeze" means that the screen is not updated. Keyboard inputs that I
make during the freeze would be executed after the freezing stops.
I do not need to touch the screen with the stylus for the bug to occur.
The bug occurs also when I actually touch the screen with the stylus.
What I expect to happen (and what actually happens in all stylus-
supporting tablets, running with Android or Windows) is that the input
from the touch screen is rejected as long as the stylus is hovering
above the screen.
I'm running Ubuntu Gnome 16.04 (non-LTS) with the latest packages. The
problem was present in 15.10 as well.
I attach a script as a workaround solution.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Attachment added: "workaround for the bug"
https://bugs.launchpad.net/bugs/1600371/+attachment/4697636/+files/palm-rejection.sh
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https://bugs.launchpad.net/bugs/1600371
Title:
Gnome freezes for some seconds on simultaneous touch and stylus input
(palm rejection fails)
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