I can confirm that cpufreq-selector has strange behavior in Ubuntu
10.04.

cpufreq-selector never hangs, it is just very slow if issued this way: 'sudo 
cpufreq-selector -c 1 -g performance'
I noticed that it takes almost exactly 30 seconds to finish the operation, 
which is strange.

$ time sudo cpufreq-selector -c 1 -g performance
real    0m30.300s
user    0m0.008s
sys     0m0.004s

$ time sudo cpufreq-selector -c 1 -g performance
real    0m30.252s
user    0m0.004s
sys     0m0.004s

$ time sudo cpufreq-selector -c 1 -g performance
real    0m30.061s
user    0m0.004s
sys     0m0.004s

However if I set SUID on 'cpufreq-selector' and issue: 'cpufreq-selector
-c 1 -g performance', it will be lightning fast, tested about 1000
times.

-- 
cpufreq-selector hangs
https://bugs.launchpad.net/bugs/511794
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