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[ernsteiswuerfel <erhard_f@xxxxxxxxxxx>]

My PowerMac G5 7,3 is also affected. One time it had a total freeze,
another time there was severe graphics corruption on the desktop but the
machine kept usable.

Graphics card according to Xorg.0.log: "ATI Radeon 9600 AP (AGP)"
(ChipID = 0x4150), DRI driver: r300

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https://bugs.launchpad.net/bugs/1571416

Title:
  System freezes shortly after reaching the desktop (Ubuntu MATE 16.04,
  PowerPC)

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  The freeze happens every time unless I use "radeon.agpmode=-1" as a
  kernel parameter. Affected machine: PowerBook G4 5,6.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-18-powerpc-smp 4.4.0-18.34
  ProcVersionSignature: Ubuntu 4.4.0-18.34-powerpc-smp 4.4.6
  Uname: Linux 4.4.0-18-powerpc-smp ppc
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: powerpc
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CasperVersion: 1.373
  CurrentDesktop: MATE
  Date: Sun Apr 17 21:08:40 2016
  IwConfig:
   lo        no wireless extensions.
   
   enP2p36s15f0  no wireless extensions.
  LiveMediaBuild: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Release powerpc (20160417.1)
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: ro ramdisk_size=1048576 file=/cdrom/preseed/username.seed boot=casper quiet --- radeon.agpmode=-1
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-18-powerpc-smp N/A
   linux-backports-modules-4.4.0-18-powerpc-smp  N/A
   linux-firmware                                1.157
  RfKill:
   0: hci0: Bluetooth
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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