intel_pstate is always reported to be set to 'performance'

[Doug McMahon]

as in -
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
intel_pstate

cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
performance
performance
performance
performance
performance
performance
performance
performance

cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq
2400000
2400187
2400093
2394468
2397281
2400000
2400093
2401125

In 15.04 it is reported at performance at login, then switches to powersave after a min. or so

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.16.0-30-generic 3.16.0-30.40~14.04.1 [modified: boot/vmlinuz-3.16.0-30-generic]
ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
Uname: Linux 3.16.0-30-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.7
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Feb 13 14:13:57 2015
InstallationDate: Installed on 2015-02-08 (5 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150203.2)
SourcePackage: linux-lts-utopic
UpgradeStatus: No upgrade log present (probably fresh install)

[Doug McMahon (mc3man)]

*-cpu
       description: CPU
       product: Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz
       vendor: Intel Corp.
       physical id: 4
       bus info: cpu@0
       version: Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz
       serial: To Be Filled By O.E.M.
       slot: U3E1
       size: 3072MHz
       capacity: 3072MHz
       width: 64 bits
       clock: 100MHz
       capabilities: x86-64 fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid cpufreq
       configuration: cores=4 enabledcores=4 threads=8

[Doug McMahon (mc3man)]

The ondemand script in 14.04.2 seems wrong, attached
If replaced by one in 15.04 then seems to work a bit better, ie. it adds
*powersave*)
   GOVERNOR="powersave"
   break