I have a Dell notebook with i7 processor and Ubuntu 14.10. When i disable SpeedStep in my BIOS my computer is very fast but the fan runs very often and the battery gets empty fast.
When I activate SpeedStep, then Ubuntu gets very slow. I have tried switching the governor to performance with no effect.
This is what cpufreq-info shows for all 7 CPUs:
analyzing CPU 7: driver: intel_pstate CPUs which run at the same hardware frequency: 7 CPUs which need to have their frequency coordinated by software: 7 maximum transition latency: 0.97 ms. hardware limits: 800 MHz - 3.70 GHz available cpufreq governors: performance, powersave current policy: frequency should be within 3.70 GHz and 3.70 GHz. The governor "performance" may decide which speed to use within this range. current CPU frequency is 1.17 GHz.
Strange thing is the frequenccy never goes above 1.2 GHz. I have tried starting firefox or compiling a big project.
This is the CPU related output of
*-cpu description: CPU product: Intel(R) Core(TM) i7-4800MQ CPU @ 2.70GHz vendor: Intel Corp. physical id: 43 bus info: cpu@0 version: Intel(R) Core(TM) i7-4800MQ CPU @ 2.70GHz slot: SOCKET 0 size: 3581MHz capacity: 3581MHz 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 smx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic 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 hle avx2 smep bmi2 erms invpcid rtm cpufreq configuration: cores=4 enabledcores=4 threads=8
I got this issue after upgrading from Ubuntu 14.04 to 14.10.
So how to get Ubuntu 14.10 to use my CPU on full speed when needed?
Update: After disabling
intel_pstate all CPUs run at 800 MHz no matter what I do. Switching governor by applet or command line has no effect.
Update: After installing
/var/log/syslog gets these messages in a loop:
Mar 3 13:00:03 scala cpufreqd: cpufreqd_set_profile : Couldn't set profile "Performance High" set for cpu0 (2700000-2700000-performance) Mar 3 13:00:03 scala cpufreqd: cpufreqd_loop : Cannot set policy, Rule unchanged ("none").
cat /sys/devices/system/cpu/cpu*/cpufreq/bios_limit prints
800000 (800 MHz) for all CPUs. Where does this limit come from? How to increase it?