Try this:

--code--

modprobe -r acpi_cpufreq
modprobe acpi_cpufreq

--/code--

This restored the symlink to CPU0's cpufreq dir for me. I've modified
the acpi-scripts directory in etc (/etc/acpi/resume, specifically) to do
this now, and everything's fine. I've added those lines to
/etc/acpi/resume.d/72-acpi-pain.sh at the end.

But, for some reason the HAL scripts (/usr/lib/hal/scripts/linux) in
Ubuntu prefer to use powersaved to sleep & hibernate instead of the ACPI
scripts. I modified the two appropriate scripts (hal-system-power-
hibernate-linux and hal-system-power-suspend-linux) to prefer to use the
scripts in /etc/acpi. I'm not entirely sure why Ubuntu has to have both
powersaved and acpi-support to begin with, but whatever.

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