I have just installed Ubuntu 6.04 and want to know how I can enable direct rendering in a i915 chipset, this is my xorg.conf:

# /etc/X11/xorg.conf (xorg 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 /etc/X11/xorg.conf manual page.
# (Type "man /etc/X11/xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg

Section "Files"
FontPath "/usr/share/X11/fonts/misc"
FontPath "/usr/share/X11/fonts/cyrillic"
FontPath "/usr/share/X11/fonts/100dpi/:unscaled"
FontPath "/usr/share/X11/fonts/75dpi/:unscaled"
FontPath "/usr/share/X11/fonts/Type1"
FontPath "/usr/share/X11/fonts/CID"
FontPath "/usr/share/X11/fonts/100dpi"
FontPath "/usr/share/X11/fonts/75dpi"
# paths to defoma fonts
FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/CID"
EndSection

Section "Module"
Load "GLcore"
Load "i2c"
Load "bitmap"
Load "ddc"
Load "dri"
Load "extmod"
Load "freetype"
Load "glx"
Load "int10"
Load "type1"
Load "vbe"
EndSection

Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "CoreKeyboard"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "es"
EndSection

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

Section "Device"
Identifier "Intel Corporation 82915G/GV/910GL Express Chipset Family Graphics Controller"
Driver "i810"
BusID "PCI:0:2:0"
EndSection

Section "Monitor"
Identifier "HP vs15"
Option "DPMS"
EndSection

Section "Screen"
Identifier "Default Screen"
Device "Intel Corporation 82915G/GV/910GL Express Chipset Family Graphics Controller"
Monitor "HP vs15"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
EndSection

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

Section "DRI"
Mode 0666
EndSection


I think everything is right but when using glxinfo i get no Direct Rendering, and the 3ddesktop doesn't have Direct Rendering, any help appreciated.

I can give you a little info that might help. I installed mandriva 2006 on a new acer aspire 1690 with the same chipset and I'm getting 3d acceleration out of the box with the i810 driver. However, mdv 2006 used the most current cvs version of xorg available so I suspect that the current stable version of xorg won't give you 3d acceleration. IIRC the reason for using a somewhat unstable version of xorg was to give full compatability with the centrino chipset which includes the 915 chipset.
You can try mdv2006(works great after some tweaking on my acer)or the alternatives are trying to get the driver from intel's website and compiling the driver or trying to isntall an updated xorg off their cvs. I'm fairly certain it won't work just tweaking your xorg.conf.

I tried to update my kernel from the standard 386 kernel to the 686 kernel,and then rebooted with the new 686 kernel, and then installed the drivers from dri.freedesktop.org/snapshots, restarted X and now I have Direct Rendering avaliable.
Why dont you try that and see what happens?

dont forget ot download the kernel headers and the restricted modules

DELETE this strig in your xorg.conf : Load "GLcore"

should work dont ask me why...

got 910gl and 3ddesk is runnig
tux racer also but not so fast