Problem solved on my hardware with:
mesa (18.0.0~rc5-1ubuntu1) bionic
....
[ Daniel van Vugt ]
* Add disable-intel-ccs-compression.patch to avoid screen corruption
when logging into Xorg sessions (LP: #1753776)
....
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https://bugs.launchpad.net/bugs/1753776
Title:
Graphics corruption just before login animation to Xorg sessions
(Intel gen9 GPUs only)
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