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Thread: Atom N280 with Jaunty == 1.33Ghz Max speed and lag

  1. #1
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    [SOLVED partly] Atom N280 with Jaunty == 1.33Ghz Max speed and lag

    See post #11 for solution
    Solved for MSI but not for Acer or other vendors with unsupported BIOS

    Hi folks,

    I have Jaunty installed on a MSI Wind u100+E, with Atom N280, 2gb ram and 160gb hdd. The cpu do not seem to be fully supported as the max clock speed is limited to 1.33 GHz and not the 1.66 GHz clock that the cpu is supposed to be running at.

    Besides that, I also experience frequent lags when scrolling and clicking.

    Am I alone or is this common?
    Is this due to the N280 not being fully supported?

    Is there a fix?

    EDIT:
    Others with similar problem:
    http://ubuntuforums.org/showthread.p...highlight=n280
    Last edited by SnappyU; December 7th, 2009 at 04:47 PM.

  2. #2
    Join Date
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    116

    Re: Atom N280 with Jaunty == 1.33Ghz Max speed and lag

    *bump*

  3. #3
    Join Date
    Jul 2009
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    3

    Re: Atom N280 with Jaunty == 1.33Ghz Max speed and lag

    I have the same problem on my Acer Aspire One D250. As far as I can see it affect all Linux kernels running on Atom N280. I find it a bit amazing that there aren't more writings about it.

  4. #4
    Join Date
    May 2008
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    Lomma, Sweden
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    126
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    Ubuntu

    Re: Atom N280 with Jaunty == 1.33Ghz Max speed and lag

    Quote Originally Posted by SnappyU View Post
    Hi folks,

    I have Jaunty installed on a MSI Wind u100+E, with Atom N280, 2gb ram and 160gb hdd. The cpu do not seem to be fully supported as the max clock speed is limited to 1.33 GHz and not the 1.66 GHz clock that the cpu is supposed to be running at.

    Besides that, I also experience frequent lags when scrolling and clicking.

    Am I alone or is this common?
    Is this due to the N280 not being fully supported?

    Is there a fix?

    EDIT:
    Others with similar problem:
    http://ubuntuforums.org/showthread.p...highlight=n280
    Do you have cpufreqd installed?
    My words fly up, my thoughts remain below;
    Words without thoughts never to heaven go.

  5. #5
    Join Date
    Jul 2009
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    3

    Re: Atom N280 with Jaunty == 1.33Ghz Max speed and lag

    I tried with cpufreqd, but no difference. The kernel seems to think that the maximum speed is 1.33GHz. Maybe I am stupid, but how can any user space daemon override that?

    I get the impression that this is a kernel thing. Or am I wrong?

    Here is the output from cpufreq-info:

    Code:
    root@Pacman:/home/pugo# cpufreq-info 
    cpufrequtils 004: cpufreq-info (C) Dominik Brodowski 2004-2006
    Report errors and bugs to cpufreq@lists.linux.org.uk, please.
    analyzing CPU 0:
      driver: acpi-cpufreq
      CPUs which need to switch frequency at the same time: 0
      hardware limits: 800 MHz - 1.33 GHz
      available frequency steps: 1.33 GHz, 1.07 GHz, 800 MHz
      available cpufreq governors: conservative, ondemand, userspace, powersave, performance
      current policy: frequency should be within 1.33 GHz and 1.33 GHz.
                      The governor "performance" may decide which speed to use
                      within this range.
      current CPU frequency is 1.33 GHz (asserted by call to hardware).
      cpufreq stats: 1.33 GHz:0,00%, 1.07 GHz:0,00%, 800 MHz:0,00%  (12)
    analyzing CPU 1:
      driver: acpi-cpufreq
      CPUs which need to switch frequency at the same time: 1
      hardware limits: 800 MHz - 1.33 GHz
      available frequency steps: 1.33 GHz, 1.07 GHz, 800 MHz
      available cpufreq governors: conservative, ondemand, userspace, powersave, performance
      current policy: frequency should be within 1.33 GHz and 1.33 GHz.
                      The governor "performance" may decide which speed to use
                      within this range.
      current CPU frequency is 1.33 GHz (asserted by call to hardware).
      cpufreq stats: 1.33 GHz:0,00%, 1.07 GHz:0,00%, 800 MHz:0,00%  (6)

  6. #6
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    Re: Atom N280 with Jaunty == 1.33Ghz Max speed and lag

    So anyone has any update on this?

  7. #7
    Join Date
    Sep 2005
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    4

    Re: Atom N280 with Jaunty == 1.33Ghz Max speed and lag


  8. #8
    Join Date
    Oct 2007
    Location
    Melbourne, Australia
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    48
    Distro
    Ubuntu 9.10 Karmic Koala

    Re: Atom N280 with Jaunty == 1.33Ghz Max speed and lag

    I understand from some posts I've read elsewhere that the N280 does the same thing under Windows XP. Perhaps it's an Intel Speedstep/BIOS things rather than a kernel issue?

    Not sure...

    If you disable Intel Speedstep in BIOS cat /proc/cpuinfo will report 1667mhz, and 1800+ with the built in overclocking feature turned on.

  9. #9
    Join Date
    Oct 2008
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    172

    Re: Atom N280 with Jaunty == 1.33Ghz Max speed and lag

    I can report that this problem is also so with my Aspire One D250.

    However, Geekbench reports a score of 1053, vs 950 for my old N270 laptop, so despite seemingly being underclocked, it still performs faster. I wonder if this is actually an error in the reported CPU speed rather than the CPU being underclocked.

    Update:

    Disabling ACPI results in the CPU speed increasing to 1.66Ghz. Interestingly, the Geekbench score actually >DROPS< to 850 points!
    Last edited by 00b00nt00; November 21st, 2009 at 10:09 AM.

  10. #10
    Join Date
    Apr 2007
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    116

    Re: Atom N280 with Jaunty == 1.33Ghz Max speed and lag

    Just read the thread at launchpad bug reporting site. So it is a bug with the BIOS ACPI table. Guess we will need a new BIOS from our netbook manufacturer to fix this.

    Meanwhile, just wondering why Windows XP can still somehow get the correct values from the same BIOS? An app like rmclock is also able to overclock (for some CPU) and configure p-steps settings etc. Is there anyway this can be done in Linux, in Ubuntu?

    It cannot be that Ubuntu / Linux, for all its customizability, should loose out to Windows on this one right? hmmm ...

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