UX32VD - CPU stuck at 0.77 GHz on AC power

Discussion in 'Asus' started by supermario87, Aug 22, 2013.

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  1. supermario87

    supermario87 Newbie

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    Hi
    [​IMG]
    as you can see in the image, no matter what load I apply on the CPU(in that screen i used Prime95 to be sure that CPU works 100%), it will stay at 33% and 0.77 GHz on AC power and it will correclty scale to max freq on battery power. The rise and the drop on graph correspond to transformer un-plug and re-plug.

    The system is updated(BIOS, drivers etc.), the power profiles are set up correctly.

    I tried ubuntu 13.04, same behavior.

    So what?

    BIOS problem? I forced reflash of 214 but no luck.
    AC transformer gone? It works apparently well, no overheat and it charges the battery without any problem(I did not measured the charge time).
    You tell me?

    Thanks!
     
  2. Prostar Computer

    Prostar Computer Company Representative

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    It's suppose to be the other way around; downclock to 0.77 GHz for battery life preservation, and stock/turbo frequency on AC. You can try using Throttlestop to prevent the downclock, though I'd recommend you get in touch with Asus about this, as it doesn't make any sense for the system to reduce it's clocks when running on the charger.
     
  3. supermario87

    supermario87 Newbie

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    Yeah, I already mailed ASUS assistance, I hope that it's only a faulty transformer!
     
  4. Prostar Computer

    Prostar Computer Company Representative

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    Best of luck! I'll keep my fingers crossed for you and the mushroom kingdom. :D
     
  5. coercitiv

    coercitiv Notebook Consultant

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    I remember a somewhat similar behavior when i tried to plug in a Dell laptop using an underpowered power brick (genuine Dell 60W charger instead of 90W): the laptop "accepted" the charger but forced the CPU into a lower frequency state.
     
  6. supermario87

    supermario87 Newbie

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    After further investigation with Unigine benchmark, I also noticed that on AC power nVidia GT620M gets downclocked heavily to her lowest freqs.
     
  7. Meaker@Sager

    Meaker@Sager Company Representative

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    Prime is going to hit the TDP limit on the U series pretty fast. It could be the AC is partially broken and when loaded to max the voltage drops below tolerance causing the throttle.
     
  8. supermario87

    supermario87 Newbie

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    For those interested, my ux32 is back and with a new motherboard! Now it goes good as always ;)
     
  9. Prostar Computer

    Prostar Computer Company Representative

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    Glad to hear it! It would be nice if they gave specifics as to what caused the problem and prompted the board replacement.
     
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