This is more visible. When selecting the window, the problem disappears.
Some refresh issue?

** Attachment added: "sshot-3.png"

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  Compiz related bug (Endianness bug somewhere)

Status in xorg package in Ubuntu:

Bug description:
  I suspect a endianness problem in this BigEndian Machine (Apple PowerBook G4 
with ATI Radeon Mobility 9700). The same architecture (bigEndian) shows no this 
specific issue on PowerMac G5 Quad with PCI-Express ATI Radeon HD4670 with VGA 
BIOS (not powerpc flashed card).

  The problem seems to be a screen changing resolution or similar having
  Compiz activated. If I switch the screen resolution on this laptop,
  the garbage on the screen is more visible than using NO COMPOSITE
  Marco Mate Display Manager.

  The problem is enhanced using a second monitor attached to a DVI
  connector on this laptop.

  Can be easly reproduced.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-116.140-powerpc-smp 4.4.98
  Uname: Linux 4.4.0-116-powerpc-smp ppc
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: powerpc
  CurrentDesktop: MATE
  Date: Fri Feb 23 14:01:47 2018
  InstallationDate: Installed on 2018-02-21 (2 days ago)
  InstallationMedia: Ubuntu-MATE 16.04.1 LTS "Xenial Xerus" - Release powerpc 
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)

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