That piglit sanity is failing with the patch may confirm my suspicion
that something doesn't add up yet I'm afraid: Since the kernel driver
and xf86-video-ati EXA code are using the same hardware formats for
display/rendering with BE & LE, I was wondering how the patch could
result in both display and glReadPixels working correctly for winsys
buffers. Looks like indeed only display works correctly, which indicates
that the GPU is effectively writing/reading PIPE_FORMAT_x8R8G8B8_*
pixels like PIPE_FORMAT_B8G8R8x8_* (which is what the kernel driver and
EXA code are using).

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

Title:
  r300 Mesa driver not loading with KMS enabled

Status in Mesa:
  Confirmed
Status in mesa package in Ubuntu:
  Confirmed

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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