I'm posting here because pstate is giving me problems as well, but in
the opposite direction.  Upon bootup and for several hours thereafter,
scaling works correctly. But after a period of time something happens
(which is of course not mentioned in any log) and scaling_max_freq is
set to scaling_min_freq and cannot be changed at all.

root@ossy:/etc# cd /sys/devices/system/cpu/cpu0/cpufreq
root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# ls
affected_cpus     cpuinfo_transition_latency   scaling_driver    
scaling_setspeed
cpuinfo_cur_freq  related_cpus                 scaling_governor
cpuinfo_max_freq  scaling_available_governors  scaling_max_freq
cpuinfo_min_freq  scaling_cur_freq             scaling_min_freq
root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_max_freq 
1600000
root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# cat cpuinfo_max_freq 
3700000
root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# cat cpuinfo_max_freq > 
scaling_max_freq 
root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_max_freq 
1600000

root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# echo performance > 
scaling_governor
root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_governor
performance
root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# cat cpuinfo_max_freq > 
scaling_max_freq
root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_max_freq 
1600000

This happens whether or not I have Enhanced SpeedStep enabled in my
BIOS.  (This is also not a BIOS limit problem.)  Disabling pstate
entirely allows me to run at 3.3GHz all the time.  Since powerclamp is
loaded and thermald is running I'm still protected from overheating
situations.  Since this is a desktop I don't really care about the power
usage but I can see where this would be a bigger problem for laptops.

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https://bugs.launchpad.net/bugs/1188647

Title:
  Please change intel_pstate default to disable

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