Hi,

There are two possible solutions for this bug (at least for all 855GM-
based hardware owners) :

Add the following line to your Device-Section in the "xorg.conf"-file :

Option "Legacy3d" "false"

With this option i can use EXA an 3D-acceleration an my DELL Latitude
D505.

Second option :

Include the following git-commit into the driver version 2.6.3 :

"Drop Legacy3D option, only use fixed texture space with non-gem."

http://cgit.freedesktop.org/xorg/driver/xf86-video-
intel/commit/?id=73db44e7ac524e84e5f0fda2d60069a9e954ad1b

This patch works perfectly with driver version 2.6.3 on my notebook and
the "Legacy3D" option is no longer needed.

** Attachment added: "git-commit : Drop Legacy3D option, only use fixed texture 
space with non-gem."
   http://launchpadlibrarian.net/24368736/drop_legacy3d_option.patch

-- 
[i845G] Fatal server error: Couldn't bind memory for BO front buffer (Jaunty)
https://bugs.launchpad.net/bugs/304871
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