The pattern of corruption looks like a pixel format mixup or colour
channel overflow. So I would bet it's related to the 10-bit/8-bit colour
changes in Mesa and Mutter...
I can't reproduce it on my desktop (Haswell, 10-bit monitor).
I can reproduce it on two laptops (Kaby Lake, 8-bit panels).
Is the problem Ubuntu-specific? I've been wondering if our mesa
patch(es) in this area are still necessary (since mutter fixed their
side, didn't they?).
** Also affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
** Changed in: xorg-server (Ubuntu)
Status: New => Confirmed
** Tags added: visual-quality
** Changed in: gnome-shell (Ubuntu)
Importance: Undecided => Medium
** Changed in: mesa (Ubuntu)
Importance: Undecided => Medium
** Changed in: mesa (Ubuntu)
Status: Incomplete => Confirmed
** Changed in: mutter (Ubuntu)
Importance: Undecided => Medium
** Changed in: xorg-server (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1753776
Title:
Graphics corruption (or distortion?) in login animation to Xorg
sessions
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