sysctl -w hw.cpufrequency is read only

Discussion in 'iPod touch Firmware 2.X Jailbreak' started by vinc32, Dec 28, 2008.

  1. vinc32

    vinc32 New Member

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    Hi,

    first of all... I'm sry for my english

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    I've got a problem...
    I like to change my CPU Speed... I want to make it back to about 380 Mhz...
    Now my Ipod has a frequency of 412 Mhz.
    The last time i did it was with 2.0 beta and now it didn't worked again.

    My steps are these...

    1. Open Terminal
    2. typing in sysctl -w hw.cpufrequency=380000000

    and now, terminal tells me...

    "/usr$ sysctl -w hw.cpufrequency=380000000
    sysctl: oid 'hw.cpufrequency' is read only"

    Anyone here, can tell me... fixing this?
    Getting the hw.cpufrequency writeable?

    Greets
    Vinc32
  2. Bubalooshi

    Bubalooshi Active Member

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    Maybe Apple took it out of 2.0?
    Not sure, I never heard of people overclocking their Pod

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  3. vinc32

    vinc32 New Member

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    Don't think so...

    Yes, I think overclocking Ipod wont be good I think... but i like to "downclock" it.
  4. Ryan

    Ryan Well-Known Member

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    hmm overclock

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    would raise the heat, lower the stability. Meh, DFU and restore.
  5. Cyanidepoison

    Cyanidepoison Active Member

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    Are you root? I noticed you used $ instead of # in your post.
  6. 101gfx

    101gfx New Member

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    What he said.
  7. vinc32

    vinc32 New Member

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    both same

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    no chance....

    i made it but it was very strange... I used the firmware of the 2gen ipod... unpacked it, looked for differences and then i looked at the only 2 main files that are different... i erased the blocker and used the old firmware name 1.1.3 in all files and for the package.
    than i used an old version of itunes and set up my ipod into recovery mode... and used the own made image to back it up... and it worked... terminal showing 530000000

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    cpufrequency...
  8. bensen

    bensen New Member

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    i dont think the iphone/ipod touch supports changing the cpu speed while running the os. apple itself speeded up the cpu with a firmware update. so with the kinda "bios" in the firmware. maybe u have to decrypt the firmware itself and take a look after the command?
  9. gunzmaiet

    gunzmaiet New Member

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    once we do find out lets try making min 400000000 and max 475000000
    and see if it can improve proformence on resource heavy apps and use less battery for simple non resource usuing apps like listening to music, rite now its always @ 412MHz
    so this should make it 400-470MHz range
  10. simonrichards150

    simonrichards150 New Member

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    I have a feeling this command must have been made read only with one of the 2.x updates if it still doesn't work as root.

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