For what it is worth, I experimented the same behavior on a Thinkpad X40
(Intel Corporation 82852/855GM Integrated Graphics Device (rev 02)) when
DRI is enabled (UXA).

I disabled DRI in my xorg.conf file and then I could suspend-to-ram and
resume fine :

Section "Device"
        Identifier      "Configured Video Device"
        Option          "NoDRI"
#       Option          "AccelMethod"           "UXA"
EndSection

-- 
Session lost on resume from sleep in Jaunty on Lenovo T500
https://bugs.launchpad.net/bugs/322202
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