Bug#945771: found possible fix
After reporting the bug, I found this article:
https://hobo.house/2018/05/18/fix-for-intel-i915-gpu-freeze-on-recent-linux-kernels/
and tried what is suggested, i.e., added file
cat > /etc/X11/xorg.conf.d/10-intel.conf <<EOF
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
EndSection
EOF
After that I have not experienced any freezes (yet).
Would it be possible that in this kind of environment Debian would
automatically use Intel driver instead of X.Org driver?
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