This CPU underclocks to 600MHz at idle. This is expected behavior.
http://www.cpu-world.com/CPUs/K8/AMD-Turion%20X2%20Ultra%20ZM-86%20-%20TMZM86DAM23GG.html
"Processor runs at 600 MHz / 0.8 Volt core voltage in the minimum performance 
state"

You could force it to 2.4GHz at all times by setting cpufreq to
performance governor, but this is not recommended, as it will reduce
battery life.

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AMD ZM-86 Processor not correctly reconized
https://bugs.launchpad.net/bugs/383964
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