Thanks. I updated my BIOS, but the problem still occurs and there seems
to be no difference.
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
[sudo] password for avraham:
X556UJ.405
05/20/2016
** Changed in: xorg (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1604070
Title:
Xorg freeze
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