strange buzzing sound after the 2.6.10 patch

Hello,

I vaguely remember someone else mentioning this problem on the list before, but I don't recall if there were any answers to the solution.

I'm running a vanilla 2.6.10 kernel patched with the acpi-2005-01-25 patch.

When running the patched kernel, I noticed that my laptop makes a very strange and faint buzzing sound. I've determined that the buzzing sound is somewhat related to CPU and HD load. When the CPU load is heavy, or when the HD is busy, the buzzing stops. But when the system idles, the buzzing continues. I've also tried forcing the HD to go into suspension using hdparm, but the buzzing continues.

Any hints or clues?
If this problem hasn't been encountered before, I'd appreciate it if someone could give hints for how I can best go about isolating the problem.

-Jing

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Try this:

edit /usr/src/linux/include/asm/param.h and change HZ to 100 (instead of 1000). Other folks here can perhaps comment on the side-effects, though I've noticed few I couldn't handle. Perhaps a divide by 0 warning with some programs that "guess" at the HZ, but other than that...

You'll find it only happens when the processor ACPI module is loaded. Go figure.

Quoted 18 lines · Jing Su

Hello,

I vaguely remember someone else mentioning this problem on the list before, but I don't recall if there were any answers to the solution.

I'm running a vanilla 2.6.10 kernel patched with the acpi-2005-01-25 patch.

When running the patched kernel, I noticed that my laptop makes a very strange and faint buzzing sound. I've determined that the buzzing sound is somewhat related to CPU and HD load. When the CPU load is heavy, or when the HD is busy, the buzzing stops. But when the system idles, the buzzing continues. I've also tried forcing the HD to go into suspension using hdparm, but the buzzing continues.

Any hints or clues?
If this problem hasn't been encountered before, I'd appreciate it if someone could give hints for how I can best go about isolating the problem.