Hi,
I'm running a Gateway 450ROG laptop with a Pentium M processor. Apparently, there is a bug in the ACPI processor module for kernel 2.6 that causes a high-pitched buzz when the processor is idling. I have hardly been able to find any information on this, and was wondering if you guys could help me out. First of all, here is a bug post that explains the problem:
http://lists.debian.org/debian-kerne.../msg00089.html
Package: kernel-source-2.6.8
Severity: minor
Version: 2.6.8-10
Hi!
There is a problem with ACPI module "processor" in recent 2.6er kernels.
After loading this module my pentium-m notebook (ACER TM291) makes a very
high-pitched sound (not the fan) on idle. It sounds like an old CRT monitor
shortly before its end. :-)
It's caused by a change in include/asm-i386/param.h, where HZ was set
from 100 to 1000.
I have already send my notebook back to the vendor for repair the
"singing capacitor" on the mainboard, but I got it back unrepaired.
They could not reproduce this behavoiur under Windows. :-(
This uses a 100Hz timer, so I have no chance of repair.
Google tells, it is a known problem which was previously discussed at Kernel
Bug Tracker.
http://bugme.osdl.org/show_bug.cgi?id=2478
http://bugme.osdl.org/show_bug.cgi?id=3549
http://bugme.osdl.org/show_bug.cgi?id=3406
But the patch for "#define HZ" was rejected.
Since I'm not sure that the found solution (disabling of C3) is the best
solution and this patch will be included in 2.6.10, I'd like to ask you
for a Debian patch to switch back to HZ=100.
Please consider to add attached patch.
I like the distribution kernel very much (together with m-a) and it would
be a pity to have to build my own kernel caused by this issue.
Kindly regards,
Erik
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www.ErikSchanze.de *********************************************
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--- linux-2.6.7/include/asm-i386/param.h 2004-06-17 09:34:28.000000000 +0800
+++ linux-2.6.7-new/include/asm-i386/param.h 2004-07-19 13:30:54.207125536 +0800
@@ -2,7 +2,7 @@
#define _ASMi386_PARAM_H
#ifdef __KERNEL__
-# define HZ 1000 /* Internal kernel timer frequency */
+# define HZ 100 /* Internal kernel timer frequency */
# define USER_HZ 100 /* .. some user interfaces are in "ticks" */
# define CLOCKS_PER_SEC (USER_HZ) /* like times() */
#endif
I have two major questions about this:
1) Is this dangerous? Will it damage my computer at all?
2) The solution at the end of the post is totally incomprehensible to me. What does it mean? How do I implement it?
Thanks so much for all your help,
--C
