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[Alex Perez <1432949@xxxxxxxxxxxxxxxxxx>]

Can confirm, I have the same problem. Workaround of 16 bit defaultdepth
is successful, albeit sub-optimal.

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https://bugs.launchpad.net/bugs/1432949

Title:
  r300 Mesa driver not loading with KMS enabled

Status in mesa package in Ubuntu:
  New

Bug description:
  I cannot get 3D acceleration to work. I was expecting to see the gears
  via the command 'glxgears' I have KMS enable on my iBook G4 by using
  the following parameter

  Linux radeon.modeset=1 video=offb:off video=1024x768-32
  video=radeonfb:off radeon.agpmode=-1

  Here are my Mesa and Xorg output

  rican-linux@ibookG4-UbuntuMATE:~$ cat /var/log/Xorg.0.log |grep -e radeon -e dri2 -e drm -e KMS
  [    32.774] Kernel command line: root=UUID=fadadc01-6fd5-49fa-85f3-9e52d0fe6155 ro quiet splash video=offb:off video=1024x768-32 video=radeonfb:off radeon.modeset=1 video=offb:off video=1024x768-32 video=radeonfb:off radeon.agpmode=-1
  [    33.203] (II) xfree86: Adding drm device (/dev/dri/card0)
  [    35.011] (II) LoadModule: "radeon"
  [    35.012] (II) Loading /usr/lib/xorg/modules/drivers/radeon_drv.so
  [    35.337] (II) Module radeon: vendor="X.Org Foundation"
  [    35.604] (II) [KMS] Kernel modesetting enabled.
  [    35.697] (II) Loading sub module "dri2"
  [    35.697] (II) LoadModule: "dri2"
  [    35.697] (II) Module "dri2" already built-in
  [    35.870] (II) RADEON(0): KMS Color Tiling: enabled
  [    35.870] (II) RADEON(0): KMS Color Tiling 2D: disabled
  [    35.870] (II) RADEON(0): KMS Pageflipping: enabled
  rican-linux@ibookG4-UbuntuMATE:~$ LIBGL_DEBUG=verbose glxinfo |grep render
  libGL: screen 0 does not appear to be DRI3 capable
  libGL: pci id for fd 4: 1002:4e56, driver r300
  libGL: OpenDriver: trying /usr/lib/powerpc-linux-gnu/dri/tls/r300_dri.so
  libGL: OpenDriver: trying /usr/lib/powerpc-linux-gnu/dri/r300_dri.so
  libGL error: No matching fbConfigs or visuals found
  libGL error: failed to load driver: r300
  libGL: OpenDriver: trying /usr/lib/powerpc-linux-gnu/dri/tls/swrast_dri.so
  libGL: OpenDriver: trying /usr/lib/powerpc-linux-gnu/dri/swrast_dri.so
  libGL error: No matching fbConfigs or visuals found
  libGL error: failed to load driver: swrast
  Error: couldn't find RGB GLX visual or fbconfig
  rican-linux@ibookG4-UbuntuMATE:~$ dpkg -l libgl1-mesa-dri
  Desired=Unknown/Install/Remove/Purge/Hold
  | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
  |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
  ||/ Name           Version      Architecture Description
  +++-==============-============-============-=================================
  ii  libgl1-mesa-dr 10.5.0~rc1-0 powerpc      free implementation of the OpenGL
  rican-linux@ibookG4-UbuntuMATE:~$ 

  rican-linux@ibookG4-UbuntuMATE:~$ lsb_release -rd
  Description:	Ubuntu Vivid Vervet (development branch)
  Release:	15.04

  rican-linux@ibookG4-UbuntuMATE:~$ apt-cache policy libgl1-mesa-dri
  libgl1-mesa-dri:
    Installed: 10.5.0~rc1-0ubuntu1
    Candidate: 10.5.0-0ubuntu1
    Version table:
       10.5.0-0ubuntu1 0
          500 http://ports.ubuntu.com/ubuntu-ports/ vivid/main powerpc Packages
   *** 10.5.0~rc1-0ubuntu1 0
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: libgl1-mesa-dri 10.5.0~rc1-0ubuntu1
  ProcVersionSignature: Ubuntu 3.18.0-13.14-powerpc-smp 3.18.5
  Uname: Linux 3.18.0-13-powerpc-smp ppc
  ApportVersion: 2.16.1-0ubuntu2
  Architecture: powerpc
  CurrentDesktop: MATE
  Date: Tue Mar 17 00:58:43 2015
  InstallationDate: Installed on 2015-03-17 (0 days ago)
  InstallationMedia: Ubuntu-MATE 15.04 "Vivid Vervet" - Alpha powerpc (20150225)
  SourcePackage: mesa
  UpgradeStatus: No upgrade log present (probably fresh install)

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