user@DebPC:~$ ls /usr/lib64/dri
dummy_drv_video.so  mach64_dri.so  r200_dri.so  radeon_dri.so  swrast_dri.so
i915_dri.so         mga_dri.so     r300_dri.so  savage_dri.so  tdfx_dri.so
i965_dri.so         r128_dri.so    r600_dri.so  sis_dri.so     unichrome_dri.so

1065 frames in 5.0 seconds = 212.838 FPS
1098 frames in 5.0 seconds = 219.598 FPS
1067 frames in 5.0 seconds = 213.274 FPS
1075 frames in 5.0 seconds = 214.955 FPS
1066 frames in 5.0 seconds = 212.944 FPS
1105 frames in 5.0 seconds = 220.734 FPS
1074 frames in 5.0 seconds = 214.777 FPS

user@DebPC:~$ cat /var/log/Xorg.0.log | grep WW
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(WW) `fonts.dir' not found (or not valid) in "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType".
(WW) RADEON(0): Color tiling is not yet supported on R600/R700
(WW) RADEON(0): Direct rendering disabled

user@DebPC:~$ cat /etc/X11/xorg.conf
Section "Device"
        Identifier     "Device0"
        Driver         "radeon"
        BusID          "PCI:1:0:0"
EndSection

(II) Loading sub module "shadow"
(II) LoadModule: "shadow"
(II) Loading /usr/lib/xorg/modules/libshadow.so
(II) Module shadow: vendor="X.Org Foundation"
    compiled for 1.7.7, module version = 1.1.0
    ABI class: X.Org ANSI C Emulation, version 0.4
(--) Depth 24 pixmap format is 32 bpp
(II) RADEON(0): Front buffer size: 5120K
(II) RADEON(0): VRAM usage limit set to 226483K
(==) RADEON(0): Backing store disabled
(WW) RADEON(0): Direct rendering disabled
(II) RADEON(0): Acceleration disabled
(==) RADEON(0): DPMS enabled
(==) RADEON(0): Silken mouse enabled
(II) RADEON(0): RandR 1.2 enabled, ignore the following RandR disabled message.
(--) RandR disabled
(II) Initializing built-in extension Generic Event Extension
(II) Initializing built-in extension SHAPE
(II) Initializing built-in extension MIT-SHM
(II) Initializing built-in extension XInputExtension
(II) Initializing built-in extension XTEST

ubuntu@ubuntu:~$ cat /media/hda0/var/log/Xorg.0.log | grep WW
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(WW) xf86CloseConsole: KDSETMODE failed: Bad file descriptor
(WW) xf86CloseConsole: VT_GETMODE failed: Bad file descriptor

ubuntu@ubuntu:~$ cat /media/hda0/etc/X11/xorg.conf
Section "ServerLayout"
    Identifier    "Layout"
    Screen        "Screen0"
EndSection

Section "Files"
EndSection

Section "Module"
    Load        "dbe"
    Load        "dri"
    Load        "dri2"
EndSection

Section "Device"
        Identifier     "Device0"
        Driver         "radeon"
        BusID          "PCI:1:0:0"
        Option         "ColorTiling" "true"
EndSection

Section "Screen"
    Identifier "Screen0"
    DefaultDepth     24
EndSection

Section "Extensions"
    Option        "Composite" "enable"
    Option        "RENDER" "enable"
    Option        "DAMAGE" "enable"
EndSection

Message from syslogd@DebPC at Aug 17 14:01:23 ...
 kernel:[ 1500.195867] Uhhuh. NMI received for unknown reason 3c on CPU 0.

Message from syslogd@DebPC at Aug 17 14:01:23 ...
 kernel:[ 1500.195872] Do you have a strange power saving mode enabled?

Message from syslogd@DebPC at Aug 17 14:01:23 ...
 kernel:[ 1500.195874] Dazed and confused, but trying to continue

user@DebPC:~$ at /var/log/Xorg.0.log | grep WW
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/X11/cyrillic".
(WW) RADEON(0): Color tiling is not yet supported on R600/R700

user@DebPC:~$ glxinfo | grep render
direct rendering: Yes
OpenGL renderer string: Mesa DRI R600 (RV730 9498) 20090101  TCL DRI2
user@DebPC:~$ glxgears
234 frames in 5.0 seconds = 46.719 FPS
195 frames in 5.0 seconds = 38.840 FPS