I reported the same problem with a ThinkPad T42 (not T42p) at
approximately the same time:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=457533
Since then (and after doing Debian updates), sometimes I get a desktop
notification of the AC->battery transition rather than a suspend.
Usually I get a suspend.
Also since then, I've been seeing a perhaps related problem that the
screen won't unblank, or will unblank briefly (1 second or less) before
blanking again. This occurs when I have left the laptop unattended for
several hours, and greets me every morning. I have to spend 5+ minutes
experimenting with the lid latch, AC cable, etc. to try to get it to
unblank. The most disturbing part is that the screen will still be off
even after a forced power off and temporarily removing the AC and
battery to give a clean cold boot. Could gnome-power-manager or
underlying userspace or kernel code be corrupting some value that
persists in the laptop's NVRAM? (The other option I see is that I have
a hardware failure (e.g., loose display cable) that just happened to
occur at the same time as the other power management problems, or that
was somehow triggered by that problem.)
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