"r128" is the appropriate driver for your card but obiously does not
work properly on your hardware. It would be a good idea to let the
upstream devs know that. xorg/driver/xf86-video-r128 is actively
maintained and still receives patches (last one 8 days ago). You could
file a bug against upstream:
https://bugs.freedesktop.org/buglist.cgi?quicksearch=r128 Just be sure
to have a complete Xorg.log ready to post this bug upstream and state
that it happens on an Apple PowerMac 3,1.
The "Invalid ROM contents"-line does not matter very much, it seems
pretty standard on PPC-Apple. My Powerbooks are working fine also though
this error shows up.

In the meantime you could try to get one of the other drivers
"modesetting", "fbdev", "fbdevhw" to work with 24 bit depth. You can use
my xorg.conf as starting point and edit it manually. Just put it in
/etc/X11.

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1541082

Title:
  [PowerMac3,1] Blotchy GUI graphics for images

Status in xorg package in Ubuntu:
  New

Bug description:
  The background image and other image files are blotchy.

  ---
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: powerpc
  BootLog:
   fsck from util-linux 2.27.1
   /dev/sda13: clean, 182266/1458176 files, 1099215/5826607 blocks
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroRelease: Ubuntu 16.04
  DistroVariant: ubuntu
  DpkgLog:

  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard: Advanced Micro Devices, Inc. [AMD/ATI] Rage 128 PRO AGP 4x TMDS 
[1002:5046] (prog-if 00 [VGA controller])
  InstallationDate: Installed on 2016-01-31 (154 days ago)
  InstallationMedia: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Alpha powerpc 
(20160123)
  Lsusb:
   Bus 002 Device 004: ID 047d:1029 Kensington Mouse*in*a*Box Optical Elite
   Bus 002 Device 003: ID 05ac:0220 Apple, Inc. Aluminum Keyboard (ANSI)
   Bus 002 Device 002: ID 05ac:1006 Apple, Inc. Hub in Aluminum Keyboard
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  Package: xorg 1:7.7+13ubuntu3
  PackageArchitecture: powerpc
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: root=UUID=4eb514e5-48d7-4e99-a402-5294c80e78cc ro quiet 
splash
  ProcVersionSignature: Ubuntu 4.4.0-24.43-powerpc-smp 4.4.10
  Renderer: Software
  Tags:  xenial ubuntu
  Uname: Linux 4.4.0-24-powerpc-smp ppc
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  _MarkForUpload: True
  version.compiz: compiz 1:0.9.12.2+16.04.20160526-0ubuntu1
  version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2

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