I just upgraded from testing to unstable and now the my OpenGL rendering is extremely slow. I'm getting 100 fps in glx gears (I was getting well beyond 1,000 before) and glxinfo says "Direct Rendering: No". I have an ATI Radeon 7500 Mobility which should use the radeon driver with DRI.

XF86Config-4 looks like this:

# XF86Config-4 (XFree86 X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the XF86Config-4 manual page.
# (Type "man XF86Config-4" at the shell prompt.)
#
# This file is automatically updated on xserver-xfree86 package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xfree86
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following commands as root:
#
# cp /etc/X11/XF86Config-4 /etc/X11/XF86Config-4.custom
# md5sum /etc/X11/XF86Config-4 > /var/lib/xfree86/XF86Config-4.md5sum
# dpkg-reconfigure xserver-xfree86

Section "Files"
FontPath "unix/:7100" # local font server
# if the local font server has problems, we can fall back on these
FontPath "/usr/lib/X11/fonts/misc"
FontPath "/usr/lib/X11/fonts/cyrillic"
FontPath "/usr/lib/X11/fonts/100dpi/:unscaled"
FontPath "/usr/lib/X11/fonts/75dpi/:unscaled"
FontPath "/usr/lib/X11/fonts/Type1"
FontPath "/usr/lib/X11/fonts/CID"
FontPath "/usr/lib/X11/fonts/Speedo"
FontPath "/usr/lib/X11/fonts/100dpi"
FontPath "/usr/lib/X11/fonts/75dpi"
EndSection

Section "Module"
Load "GLcore"
Load "bitmap"
Load "dbe"
Load "ddc"
Load "dri"
Load "extmod"
Load "freetype"
Load "glx"
Load "int10"
Load "record"
Load "speedo"
Load "type1"
Load "vbe"
EndSection

Section "InputDevice"
Identifier "Generic Keyboard"
Driver "keyboard"
Option "CoreKeyboard"
Option "XkbRules" "xfree86"
Option "XkbModel" "pc104"
Option "XkbLayout" "us"
EndSection

Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/psaux"
Option "Protocol" "PS/2"
Option "Emulate3Buttons" "true"
Option "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
Identifier "Generic Mouse"
Driver "mouse"
Option "SendCoreEvents" "true"
Option "Device" "/dev/input/mice"
Option "Protocol" "ImPS/2"
Option "Emulate3Buttons" "true"
Option "ZAxisMapping" "4 5"
EndSection

Section "Device"
Identifier "Generic Video Card"
Driver "radeon"
vendorname "ati"
boardname "radeon"
EndSection

Section "Monitor"
Identifier "Generic Monitor"
HorizSync 28-50
VertRefresh 43-75
Option "DPMS"
vendorname "[Generic Monitor]"
modelname "[Generic Monitor]"
ModeLine "1024x768/60Hz" 65 1024 1032 1176 1344 768 771 777 806 -HSync -VSync
EndSection

Section "Screen"
Identifier "Default Screen"
Device "Generic Video Card"
Monitor "Generic Monitor"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1024x768/60Hz" "640x480"
Virtual 0 0
EndSubSection
SubSection "Display"
Depth 4
Modes "1024x768/60Hz" "640x480"
Virtual 0 0
EndSubSection
SubSection "Display"
Depth 8
Modes "1024x768/60Hz" "640x480"
Virtual 0 0
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768/60Hz" "640x480"
Virtual 0 0
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768/60Hz" "640x480"
Virtual 0 0
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768/60Hz" "640x480"
Virtual 0 0
EndSubSection
EndSection

Section "ServerLayout"
Identifier "Default Layout"
Screen "Default Screen"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
InputDevice "Generic Mouse"
EndSection

Section "DRI"
Mode 0666
EndSection


Section "InputDevice"

Identifier "Keyboard"

Option "XkbModel" "pc104"
Option "XkbLayout" "us"
Driver "keyboard"
EndSection


Section "InputDevice"

Identifier "Mouse"

Option "Protocol" ""
Option "Device" "/dev/mouse"
Driver "mouse"
Option "Emulate3Buttons"
EndSection


Section "ServerFlags"

EndSection

---

How can I get my direct rendering working again?
Thank you!

did you have a DRI section in your XF86Config-4 file when using testing?

I believe I did. The backup config file also looks very similar to the one I'm using. I seem to think that the problem is something other than the config file.

did you switch kernels?

what about xlibmesa-gl?

can you post some of the x logs?

Was this problem ever fixed? I seem to be having the same problem lately. I installed Testing the Debian Installer and upgraded to Unstable and after upgrading to unstable, it seems that all my games like Tuxracer and MOHAA will start up fine until I get into the game itself. Then the screen will distort and X will either freeze or the game will crash leaving the screen still distorted. Even the consoles become distorted and unreadable. I'm very frustrated with this, and I have yet to see a solution to it that works... so any ideas? I'm tired of trying to play MOHAA just to have to restart because X freezes up and distorts my screen. >.<