I'm beginning to think this is not a kernel bug, but something caused by
some configuration file/change.


This bug persists even when downgrading to two previous kernels,

linux-image-3.2.0-2-686-pae_3.2.19-1
linux-image-3.2.0-2-686-pae_3.2.18-1

downloaded from snapshot.debian.org (thanks for pointing it out, Ben
Hutchings)

The bug is present even when upgrading to linux-image-3.4-trunk-686-pae
(from Debian experimental). (Won't install linux-image-3.5 at the
moment, apt-get complains about a missing linux-kbuild-3.5)

The bug is not present when booting from a live CD (happened to have
lying around a 'Gnome 3.0 live DVD, built on openSuse'. (I closed the
lid four times -> sleep. )

Searching on "legacy resume(): pnp_bus_resume" I come across a number of
(possibly or not, be careful) related reports, involving Thinkpads
(X200, X201, T400).

For example here,

https://bugs.launchpad.net/ubuntu/+source/libcgroup/+bug/838729

one poster reports that the bug disappears when using pm-suspend from
the command line. I confirm that I've tried that now six times, without
GDM crashing.


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