(In reply to erhard_f from comment #15)
> Played around a bit with xorg and kernel options on my G5 and worked out
> that I can drive the Radeon 9650 at AGP x8 if I disable DRI completely via
> Option "NoAccel" "true" in /etc/xorg.conf.
> I had no GPU-lockups since then

Sure, because you're not actually using the problematic AGP
functionality. :)

> and xorg is much more responsive despite lacking DRI hardware acceleration
> (radeon.agpmode=-1 with DRI enabled).

FWIW, the value of the radeon.agpmode parameter shouldn't matter if you
disable DRI (which BTW means no GPU hardware acceleration can be used at

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  System freezes shortly after reaching the desktop (Ubuntu MATE 16.04,

Status in Linux:
Status in linux package in Ubuntu:

Bug description:
  The freeze happens every time unless I use "radeon.agpmode=-1" as a
  kernel parameter.

  Affected machines:
  PowerBook G4 5,6 + PowerMac G5 7,3 (w. "ATI Radeon 9600 AP (AGP)".

  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
   lo        no wireless extensions.

   enP2p36s15f0  no wireless extensions.
  LiveMediaBuild: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Release powerpc 
   Socket 0:
     no product info available
   Socket 0:
     no card
   PATH=(custom, no user)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: ro ramdisk_size=1048576 file=/cdrom/preseed/username.seed 
boot=casper quiet --- radeon.agpmode=-1
   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
   0: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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