I found a workaround: recompiling the kernel with CONFIG_MODULE_FORCE_UNLOAD=y allows forced unloading with "rmmod -f acpi_cpufreq" and then you can modprobe the module again on resume.
-- Intel Core 2 Duo - Resume from suspend, CPU Frequency Scaling is gone on CPU1 https://bugs.launchpad.net/bugs/183033 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs