no self-refresh during S3 - any debug hints?

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Hello ACPI experts,

I made a breakthrough in my s2r debugging last night when I realized
that the sooner I pressed the power button after suspend, the more
life the system exhibited post-resume.  In fact when I attempted to
resume immediately after entering suspend, my system had a successful
resume from memory for the first time ever.  Therefore, I have a new
hypothesis: DRAM self-refresh mode is not being properly entered.

I'm running kernel 2.6.20 on a laptop with an ATI IGP 320M Northbridge
and an Athlon XP.  DSDT has a _PTS but no _GTS.  I'm comfortable
recompiling the kernel.  Any suggestions as to how to proceed,
experiments to run, etc.?

Thanks for any help you can give,
Jeff
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