Ok, this happened just now with A04 and stock vivid kernel.
$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
A04
05/15/2015
** Changed in: xorg (Ubuntu)
Status: Incomplete => Confirmed
** Changed in: xorg (Ubuntu)
Importance: Low => High
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https://bugs.launchpad.net/bugs/1467595
Title:
cursor sometimes disappears on XPS 13 9343 and external monitor
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