[Bug 34521] New: EnableColorTiling causes graphical distortion making X unusable

[bugzilla-daemon@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=34521

           Summary: EnableColorTiling causes graphical distortion making X
                    unusable
           Product: Mesa
           Version: 7.10
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: jamesbroadhead@gmail.com


With EnableColorTiling enabled, when I run certain programs, my X server
becomes completely distorted, with screen elements rendering correctly, but in
mis-positioned blocks all over the screen. X remains responsive, but I cannot
return it to a usable state from the 'bugging' condition. There is no output in
dmesg or Xorg.0.log relevant to this. 

Setup: 
Distro: Gentoo
Kernels: linux-2.6.36, linux-2.6.37, linux-2.6.38-rc5
Driver : x11-drivers/xf86-video-ati-6.14.0
DDX : r600 (another user in #gentoo had this with r300)
Mesa :   media-libs/mesa-7.10 (gallium and classic)
LibDRM:  x11-libs/libdrm-2.4.23
X-Server: x11-base/xorg-server-1.9.4

KMS : Enabled
EnablePageFlip : Enabled, Disabled
EnableColorTiling: Enabled

I originally encountered this bug with the 'classic' mesa renderer(?), but it
affects 'gallium' also.

Reproduction:
EnableColorTiling >> /etc/X11/xorg.conf
Start X
Run Openoffice (Or some in-browser java applets, or Gogglesmm, or some elements
of calibre)

Hardware: 
01:00.0 VGA compatible controller: ATI Technologies Inc RV770 [Radeon HD 4850]

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