Those lines in xsession-errors confirm compiz sets LIBGL_ALWAYS_INDIRECT:
Checking for texture_from_pixmap: not present.
Trying again with indirect rendering:
Checking for texture_from_pixmap: present.
However, your X log shows texture_from_pixmap is supported by the driver:
(II) AIGLX: enabled GLX_texture_from_pixmap with driver support
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Incomplete => Confirmed
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[i855] No direct rendering for Intel 82852/855GM in Jaunty
https://bugs.launchpad.net/bugs/368995
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