Messages in this thread | | | Date | Tue, 13 May 2003 14:50:47 +0200 (MEST) | From | Tuncer M "zayamut" Ayaz <> | Subject | Re: 2.5.69 strange high tone on DELL Inspiron 8100 |
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> 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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