Comment # 9 on bug 964837 from Silviu Marin-Caea

No, that wasn't it. Screen looks exactly the same. Confirmation that tiling is
disabled:

[    28.857] (II) RADEON(0): KMS Color Tiling: disabled
[    28.857] (II) RADEON(0): KMS Color Tiling 2D: disabled
[    28.857] (II) RADEON(0): KMS Pageflipping: enabled
[    28.857] (II) RADEON(0): SwapBuffers wait for vsync: enabled
[    28.892] (II) RADEON(0): Output VGA-0 has no monitor section
[    28.892] (II) RADEON(0): Output LVDS has no monitor section
[    28.928] (II) RADEON(0): Output S-video has no monitor section
[    28.929] (II) RADEON(0): Output DVI-0 has no monitor section