I know as much as is mentioned in the KB. The problem got worse enough
for me to experiment so I tried this even though it was for an older
version. Unfortunately you can ignore this workaround, the problem has
resurfaced.
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It seems the problem had existed before in Ubuntu 14.04 and Dell
recommended using proprietary drivers for trackpad. Here is the Dell KB
with the info: http://www.dell.com/support/article/us/en/19/SLN297219/EN
Just to experiment I tried doing the same with my Ubuntu 16.04 and
installed the drivers
I also have a Dell XPS 13 and ever since I updated the trackpad is freezing up
randomly for me too. External mouse works fine.
The trackpad isn't exactly freezing, you can move the pointer by simultaneously
pressing down left click on the trackpad and moving that finger. My trackpad
however does
