The game endless-sky with version 0.9.4-3.1 is unplayable on openSUSE Leap
42.1. It sporadically freezes the whole screen especially on the space map and
on the outfitter screen after 20min of playing at max. Once it was possible to
use Ctrl + Alt + F2 to capture the kernel stack trace and the gdb backtrace but
I've noticed that no debuginfo package is built. I could only see that libxcb
is involved and that it is hanging in poll().

Usually it crashes in a way that also switching the login terminal is not
possible and even a kdump can't be triggered by sysrq-c. It happens both in
window mode and fullscreen mode.

Other games like e.g. Chromium B.S.U. or Warzone 2100 work fine.

HW is a Lenovo Thinkpad X250 laptop.
Display manager: gdm
Window manager GNOME 3

Will build with debuginfo and retest, will update to version 0.9.6 and retest.