Re: Centrino CpuFreq (< 600 mhz)

[Joan Tur <jtur@wanadoo.es>]

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Es Divendres 10 Desembre 2004 21:57, en obi va escriure:
| On Fri, Dec 10, 2004 at 09:00:06PM +0100, Joan Tur wrote:
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| > Es Divendres 10 Desembre 2004 18:58, en obi va escriure:
| > | On Fri, Dec 10, 2004 at 06:47:50PM +0100, Arnaud Fontaine wrote:
| > | Hi, I have a 1.4GHz and only the 400 MHz options works. With anything
| > | lower, the kernel complains about missing ticks and resets the minimum
| > | to 600Mhz. I guess it's a machine-related capabilities ... I have a
| > | T41.
| >
| > No luck here (I've only added the 400mhz line)... could you send me
| > your .config file?  Thanks!  ;)
|
| Sure: it's attached. I use the sid/debian kernel-source-2.6.9.
Thanks.  The problem was the following kernel option:
CONFIG_X86_SPEEDSTEP_CENTRINO_ACPI=y (has to be NO)

Mine is a GM855 + pentium-M 1500 and I'm using kernel 2.6.9-cko3.

Despite it shows 400mhz in /etc/cpuinfo, 600mhz are shown
in /sys/devices/system/cpu/cpu0/cpufreq/ as the actual speed value.  400mhz
appears in available speeds, so does in scaling_min_freq and
cpuinfo_min_freq.

CONFIG_X86_PM_TIMER=y makes the message "losing tics" dissapear; it still
shows (2 times in 20 minutes) the following messages (dmesg output):
- -----
Warning: CPU frequency out of sync: cpufreq and timing core thinks of 400000,
is 600000 kHz.
Warning: CPU frequency is 400000, cpufreq assumed 600000 kHz
- -----

Anyway it seems to work... I'll try to check the battery life tomorrow  ;)

Thanks for your info  ;)

Bye!

| Cheers,
| graziano

- -- 
Joan Tur (aka Quini), Eivissa-Spain
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