Hi, first i'm sorry if my english isn't good, i'm from argentina.

I was searching for everywhere and i can't solve my problem.

I can't activate the direct rendering.

First install the intel driver (for i845G). Installation goes succesfully... but...

first time that i reboot the driver works (but no direct rendering) next time i found an error in the /var/log/Xorg.0.log
drmOpenError or something like this. /dev/dri/card0 not found. the first time that not happens.

thanks if someone can help me and sorry for my english.

dri requires a kernal module. try "modprobe i915" if it work there will be no feedback. type lsmod and it should list i915 and drm. if this works add i915 to /etc/modules.autoload.d/kernel-2.6

if it says module not found, enable AGP AGP_INTEL DRM and DRM_I915 in kernel config all found under device drivers/character devices, i915 is visable after selecting "Intel 830M, 845G, 852GM, 855GM, 865G"

once the module loads/complied it (dmesg to check) add

Section "DRI"
Mode 0666
EndSection

to xorg.conf for non root access

It should work then.
If you have issues with the i915 driver try i830 newer xorg shouldn't have any problems

If compiling a kernel is beyond you, look for a x11-drm slackpack. cannie help you there, i do gentoo