[Bug 594837] Re: Lucid SRU: Intel Core i3/i5/i7 hang on resume from suspend (SCI_EN)

[mikeos]

Sorry to comment on a fixed bug, but my problem seems to be closely
related. My system is Dell Latitude e6410 with Intel i7.

Resume from suspend to memory  was not working for me on kernels prior
2.6.36. Since 2.6.36 it works flawlessly but only when resuming with AC
adapter plugged-in.

When resuming on batteries (no matter whether previously suspended on AC
or batteries) the system completely hangs - either on first attempt or
usually on 2nd or 3rd or at max a  5th attempt of sequential
suspend/resume cycles.

No success tweaking with /etc/pm/*  and /usr/lib/pm-utils/* disabling
there actions related to current computer power source.

Finally disabling CPU speed-step in BIOS resolved the problem. Tested
with success on 20 sequential suspend/resume cycles on battery power.
Evidently this a workaround which is killing the battery :/

I'm not sure what *exactly* the script /usr/lib/pm-
utils/sleep.d/94cpufreq  is about, but disabling it had no effect. I
don't have enough knowledge to perform advanced tests with CPU scaling
and governors.

-- 
Lucid SRU: Intel Core i3/i5/i7 hang on resume from suspend (SCI_EN)
https://bugs.launchpad.net/bugs/594837
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