10

After updating my ubuntu 13.10 to 14.04 there only these to govenors available for my cpu, instead of additionally ondemand and conservative.

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors 
performance powersave

My cpu is a Intel(R) Core(TM) i5-4200M CPU @ 2.50GHz, my laptop a LENOVO B5400 80B6QB0 and my kernel version is 3.14.1-031401-generic x86_64

Before updating the four governors were available. If this is important, I have installed tlp and indicator-cpufreq.

How do I get back the missing two govenors? ondemand is really important to me because of power saving.

kinske
  • 203

2 Answers2

10

They are not missing, but depricated, since the Linux kernel (3.9 and later) includes the Intel P-State Driver.

kraxor
  • 5,627
0

Missing indeed, not deprecated at all. An useless/featureless like Intel P-State has no strength or arguments for deprecating anything (at least, yet)

For getting back the good old, amazing and unreplaceable ACPI driver working back again, we should enter on terminal:

sudo cp /etc/default/grub /etc/default/grub.backup
sudo nano /etc/default/grub

the line starting with "GRUB_CMDLINE_LINUX_DEFAULT" should be:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=disable"

ctrl+o for saving, ctrl+x for quitting, and then enter:

sudo update-grub

and then:

sudo sync && sudo reboot

I did it right now, and got all those crucial options back again - and please, please, everyone, and asking it deeply from my heart, never name crucial options as "deprecated" again! ;)

Paulo Silva
  • 337