Hi all,
I had the same problem on Dell Vostro 1500, Core 2 Duo. After resume, CPU1 was 
stuck on 1994 MHz and there were analogous ACPI error messages in log. I tried 
newest BIOS, switching CPU1 off --- without success, but finally I found a 
workaround at:

http://gnugeneration.epfl.ch/users/fasnacht/d630_cpufreq

Briefly, the problem is probably in the acpi-cpufreq module. If you
remove it before suspend (by force: rmmod -f) and insert back after
resume, frequency scaling works ok for both cores. Of course, acpi-
cpufreq has to be compiled as a module (which is likely with
distribution kernel) and you should stop your cpufreq/power daemon
first. I know nothing about *buntu (using gentoo), but this can help you
too.

Btw. 1994 is the default frequency, which my C2D starts at without any
cpufreq support.

-- 
Intel Core 2 Duo - Resume from suspend, CPU Frequency Scaling is gone on CPU1
https://bugs.launchpad.net/bugs/183033
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