Arch Linux

kromonos

Member

Registered: 2007-07-25

Posts: 5

Atom N280 with 1.33GHz instead 1.66

I've bought an Acer Aspire One D150 with an Atom N280 1.66GHz CPU ...
But cpufreq says:

cpufrequtils 005: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to cpufreq@vger.kernel.org, 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: powersave, ondemand, performance
  current policy: frequency should be within 800 MHz and 1.33 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz.
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: powersave, ondemand, performance
  current policy: frequency should be within 800 MHz and 1.33 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz.

I don't know why hardware limits are 800 MHz - 1.33GHz with a N280 1.66GHz CPU .. Is it possible, that this occures because it is a hyperthreadable CPU?

thayer

Fellow

From: Vancouver, BC

Registered: 2007-05-20

Posts: 1,560

Website

Re: Atom N280 with 1.33GHz instead 1.66

$ cat /etc/conf.d/cpufreq 
#configuration for cpufreq control

# valid governors:
#  ondemand, performance, powersave,
#  conservative, userspace
governor="ondemand"

# valid suffixes: Hz, kHz (default), MHz, GHz, THz
min_freq="500MHz"
max_freq="1600MHz"

What does yours read?

---

thayer williams ~ cinderwick.ca

kromonos

Member

Registered: 2007-07-25

Posts: 5

Re: Atom N280 with 1.33GHz instead 1.66

2:22:15 kromonos» cat /etc/conf.d/cpufreq
#configuration for cpufreq control

# valid governors:
#  ondemand, performance, powersave,
#  conservative, userspace
governor="ondemand"

# valid suffixes: Hz, kHz (default), MHz, GHz, THz
min_freq="800MHz"
max_freq="1.66GHz"

tehabe

Member

Registered: 2008-10-14

Posts: 82

Re: Atom N280 with 1.33GHz instead 1.66

I think the min_freq of the N280 should be 1 GHz but I might be wrong about that.

thayer

Fellow

From: Vancouver, BC

Registered: 2007-05-20

Posts: 1,560

Website

Re: Atom N280 with 1.33GHz instead 1.66

2:22:15 kromonos» cat /etc/conf.d/cpufreq
#configuration for cpufreq control

# valid governors:
#  ondemand, performance, powersave,
#  conservative, userspace
governor="ondemand"

# valid suffixes: Hz, kHz (default), MHz, GHz, THz
min_freq="800MHz"
max_freq="1.66GHz"

Try increasing the max to 2000MHz.  Also, which frequency scaling driver are you loading in /etc/rc.conf?  I'm just using acpi-cpufreq.

---

thayer williams ~ cinderwick.ca

kromonos

Member

Registered: 2007-07-25

Posts: 5

Re: Atom N280 with 1.33GHz instead 1.66

Just acpi-cpufreq .. too

Edit: Increasing max to 2000MHz, nothing change
Edit²: I found in another forum, that it should work, if I turn off speedstep in bios .. but there is no option for speedstep in my bios -.-

Last edited by kromonos (2009-06-01 09:30:12)

mokkurkalve

Member

From: Bergen, Norway

Registered: 2009-08-29

Posts: 60

Re: Atom N280 with 1.33GHz instead 1.66

Having same issue with same netbook (Acer Aspire One D150) running current Arch linux with stock unmodified 2.6.30.5 kernel. Ubuntu users have reported similar issues with Atom N280 CPU:
http://ubuntuforums.org/showthread.php?t=1209082

The BIOS in this thingy have no settings to tweek, so the posting kromonos was referring to is of no help to us alas... Is this a kernel issue?
Might things change with 2.6.31....? Time will show I recon. For now I just have to run it a little underclocked....   :-S

---

"ONLY THOSE WHO ATTEMPT THE IMPOSSIBLE WILL ACHIEVE THE ABSURD"
- Oceania Association of Autonomous Astronauts

vajorie

Member

Registered: 2009-03-12

Posts: 66

Re: Atom N280 with 1.33GHz instead 1.66

I rmmod'ed acpi-cpufreq and modprobed p4-clockmod and it went up to 1.66. cpufreq-info:

analyzing CPU 0:
  driver: p4-clockmod
  CPUs which run at the same hardware frequency: 0 1
  CPUs which need to have their frequency coordinated by software: 0 1
  maximum transition latency: 10.00 ms.
  hardware limits: 208 MHz - 1.67 GHz
  available frequency steps: 208 MHz, 417 MHz, 625 MHz, 833 MHz, 1.04 GHz, 1.25 GHz, 1.46 GHz, 1.67 GHz
  available cpufreq governors: userspace, performance
  current policy: frequency should be within 208 MHz and 1.67 GHz.
                  The governor "userspace" may decide which speed to use
                  within this range.
  current CPU frequency is 1.67 GHz.
analyzing CPU 1:
  driver: p4-clockmod
  CPUs which run at the same hardware frequency: 0 1
  CPUs which need to have their frequency coordinated by software: 0 1
  maximum transition latency: 10.00 ms.
  hardware limits: 208 MHz - 1.67 GHz
  available frequency steps: 208 MHz, 417 MHz, 625 MHz, 833 MHz, 1.04 GHz, 1.25 GHz, 1.46 GHz, 1.67 GHz
  available cpufreq governors: userspace, performance
  current policy: frequency should be within 208 MHz and 1.67 GHz.
                  The governor "userspace" may decide which speed to use
                  within this range.
  current CPU frequency is 1.67 GHz.

is there a specific reason we weren't supposed to us that one instead of acpi-cpufreq?

kromonos

Member

Registered: 2007-07-25

Posts: 5

Re: Atom N280 with 1.33GHz instead 1.66

Thx for the tipp with p4-clockmod.
Have you tried to use ondemand governor? I tried, but he didn't want to use it
Anyone a hint to activate it?