Re: 2.5.69 strange high tone on DELL Inspiron 8100

[Tuncer M "zayamut" Ayaz <tuncer.ayaz@gmx.de>]

> Andrew McGregor wrote:
> > Try this (which will make no difference to the effectiveness of APM on 
> > this machine):
> > 
> >> CONFIG_PM=y
> >>
> >> CONFIG_APM=y
> >> CONFIG_APM_DO_ENABLE=n
> >> CONFIG_APM_CPU_IDLE=n
> >> CONFIG_APM_DISPLAY_BLANK=y
> >> CONFIG_APM_REAL_MODE_POWER_OFF=y
> >>
> >> CONFIG_CPU_FREQ=n
> >> CONFIG_CPU_FREQ_TABLE=n
> >>
> >> CONFIG_X86_SPEEDSTEP=n
> > 
> > 
> > Reasoning:
> > cpufreq and speedstep don't work on Dell P3 laptops anyway, and the 
> > *internal power supplies* of the i8x00 series make wierd noises when APM
> 
> > tries to idle the CPU.  The board will do this anyway, without making 
> > noise, so linux need not.
> 
> My Dell Latitude C600 shows the exact same problem. I noticed it after 
> upgrading to from RH7.x to RH8 with kernel 2.4.18-27.8.0. I believe this 
> kernel is customized by RH to use HZ=500 or something in that region.
> 
> With your analysis of the problem I was able to remove the noise by 
> using the "apm=idle-threshold=100" parameter on the kernel commandline. 
> This turns off APM idle calls without requiring kernel recompilation.
> 
> Using the "i8k" kernel module, I have verified that the temperature of 
> the CPU is unchanged with APM idle turned off. I have not tried to 
> measure power consumption or battery use.

so, cool no need to turn that on at all then.
--> no kernel bug, just a case of bad internel psu inside an overpriced
laptop :D

> Thanks for the tip!

no problem. actually, I'm glad the thread I've started did help you
and also myself to understand the problem.

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