Disable Speedstep / Disable downclocking / Coolbook alternative ?

Discussion in 'macOS' started by pooprscooper, Nov 30, 2010.

  1. pooprscooper macrumors regular

    Aug 5, 2008
    I'm looking to figure out a way to disable downclocking on my early 2008 2.4Ghz MBP down to 800Mhz making me feel like I'm on a Netbook. I refuse to pay for Coolbook since anytime I need to reformat I have to buy a new license.

    Is there a kext that manages speedstep I can disable? I've tried setting 2.4 manually with "sysctl -w hw.cpufrequency_min=2400000000" but it says it's read only.

    "sysctl hw.cpufrequency hw.cpufrequency_min hw.cpufrequency_max" gives:
    hw.cpufrequency: 2400000000
    hw.cpufrequency_min: 2400000000
    hw.cpufrequency_max: 2400000000

    Any ideas or apps?
  2. jayhawk11 macrumors 6502a


    Oct 19, 2007
    So you want to rip the engine out of your Ferrari and replace it with one from an electric scooter...why, exactly?
  3. tpth macrumors member

    Oct 4, 2007
    Other way round, dude. And why do people feel the need to post entirely useless answers like that anyway?

    OP, no idea I'm afraid. Can you change the permissions on that file to make it writeable?
  4. iThinkergoiMac macrumors 68030

    Jan 20, 2010
    Put "sudo" in front of your command and it'll do what you want, I imagine.

    Just be careful with sudo... if you don't know already, it drops that command into super user mode, which can have disastrous consequences if you've got the wrong command.
  5. pooprscooper thread starter macrumors regular

    Aug 5, 2008
    I used sudo and it still says it's read only. :(
  6. rtrt, Dec 20, 2010
    Last edited: Aug 13, 2011

Share This Page