I have also opened the following upstream bugreport:
https://gitlab.freedesktop.org/xorg/xserver/issues/683
** Bug watch added: gitlab.freedesktop.org/xorg/xserver/issues #683
https://gitlab.freedesktop.org/xorg/xserver/issues/683
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** Attachment added: "display_corruption_1.mp4"
https://bugs.launchpad.net/ubuntu/+source/xorg-server-hwe-16.04/+bug/1824393/+attachment/5254954/+files/display_corruption_1.mp4
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** Attachment added: "display_corruption_2.mp4"
https://bugs.launchpad.net/ubuntu/+source/xorg-server-hwe-16.04/+bug/1824393/+attachment/5254955/+files/display_corruption_2.mp4
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