Public bug reported:

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)

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: apport-bug corruption powerpc xenial

** Attachment added: "more screenshot are available on request"

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  Compiz related bug (Endianness bug somewhere)

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