Comment 30 for bug 154104

I can't enable direct rendering on my Gateway MX6638b laptop with Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller... I have Ubuntu 8.04 and I try to configure my xorg.conf but still can't enable dri...

Compiz works good but some effects are very slow... 3D is very very slow.

$ glxinfo
name of display: :0.0
libGL error: open DRM failed (Operation not permitted)
libGL error: reverting to (slow) indirect rendering
display: :0 screen: 0
direct rendering: No (If you want to find out why, try setting LIBGL_DEBUG=verbose)
[...]

Here is my xorg.conf:

# xorg.conf (X.Org 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 xorg.conf manual page.
# (Type "man 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 "InputDevice"
 Identifier "Generic Keyboard"
 Driver "kbd"
 Option "XkbRules" "xorg"
 Option "XkbModel" "pc105"
 Option "XkbLayout" "gb"
EndSection

Section "InputDevice"
 Identifier "Configured Mouse"
 Driver "mouse"
 Option "CorePointer"
EndSection

Section "InputDevice"
 Identifier "Synaptics Touchpad"
 Driver "synaptics"
 Option "SendCoreEvents" "true"
 Option "Device" "/dev/psaux"
 Option "Protocol" "auto-dev"
 Option "HorizEdgeScroll" "0"
 Option "SHMConfig" "true"
 Option "RightEdge" "5900"
 Option "HorizTwoFingerScroll" "1"
 Option "FastTaps" "1"
EndSection

Section "Device"
 Identifier "Configured Video Device"
EndSection

Section "Monitor"
 Identifier "Configured Monitor"
EndSection

Section "Screen"
 Identifier "Default Screen"
 Monitor "Configured Monitor"
 Device "Configured Video Device"
EndSection

Section "ServerLayout"
 Identifier "Default Layout"
 Screen "Default Screen"
 InputDevice "Synaptics Touchpad"
EndSection

How can I configure my xorg.conf to get direct rendering work??? Please help!!!