Most recent kernel where this bug did not occur: 2.6.13.3 Distribution: Debian GNU/Linux with Vanilla Kernel Hardware Environment: Dell Latitude D510 Software Environment: GNOME 2.10.2 Problem Description: There are coming regulary high frequent bieps from within the Notebook when APCI is bootet up with CONFIG_ACPI_PROCESSOR = On set. This really made me scarry and let the Dell support aggrement use. They swapped my hard drive without solving the problem. As they don't ship GNU/Linux there was no more noise from the book till rsyncing my data back with the drivers loaded. :-) Tracing it down to ACPI_PROCESSOR takes a lot of trial and error. But I'm glad to have it found now. Unfortunately there is not much use of a Centrino without this option. :-) Steps to reproduce: Put CONFIG_ACPI_PROCESSOR = On at a Dell Latitude D510
>Most recent kernel where this bug did not occur: 2.6.13.3 This bug is still in 2.6.13.3 - I did overead the >>>not<<< when posting the bug.
This bug is still in 2.6.13.4
Some hardware sings when subjected to rapid changes in charge or temperature. please paste the contents of /proc/acpi/processor/*/power into this bug report. then # echo 1 >/sys/module/processor/parameters/max_cstate and report if the sound goes away. If so, try successively larger numbers until it comes back. If that doesn't do it, then please cat /sys/devices/system/cpu/cpu0/cpufreq/* into this bug report.
xcomm:~# cat /proc/acpi/processor/CPU0/power active state: C3 max_cstate: C8 bus master activity: 00001000 states: C1: type[C1] promotion[C2] demotion[--] latency[001] usage[ 00000010] C2: type[C2] promotion[C3] demotion[C1] latency[001] usage[ 00544467] *C3: type[C3] promotion[C4] demotion[C2] latency[085] usage[ 00189168] C4: type[C3] promotion[--] demotion[C3] latency[185] usage[ 00525237]
Hi Len, First of many thanks to you for your help with this! If I echo 1 or 2 than there is no noise, when echo 3 is send, the noice is back. xcomm:~# echo 3 > /sys/module/processor/parameters/max_cstate xcomm:~# cat /sys/devices/system/cpu/cpu0/cpufreq/* 0 800000 1600000 800000 1600000 1333000 1067000 800000 userspace performance 800000 centrino performance 800000 800000
http://www.thinkwiki.org/wiki/Problem_with_high_pitch_noises -> Solutions for CPU-triggered noise -> re-configure the kernel ( -> Processor type and features -> Timer frequency -> 250 or 100 HZ instead of 1000 HZ) I'd suggest closing this bug.