FAQ
Q: Why does the kernel freeze on boot when CPUFreq support is enabled?
A: CPUFreq doesn't know the maximum supported frequency of your CPU and uses a static table of frequencies up to 624 MHz. You should take a look at which frequency scaling governor is selected as default in your kernel configuration. If it's "performance", CPUFreq will try to run your CPU at the highest frequency in its table... 624 MHz. While the Acer n50 Premium can usually be overclocked from its usual 520 MHz to this frequency, the n50 Standard definitely can't run twice as fast as normal and will lock up.
Solution: Change the default frequency governor in the kernel configuration to "userspace" so that you can boot the kernel. You can then change the maximum allowed frequency in /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq to a value that works for you and activate a frequency governor like "performance", "ondemand" etc.