Re: High-pitch noise with 2.6.0-test11

[Troels Walsted Hansen]

Jean-Marc Valin wrote:
> I just installed 2.6.0-test11 on my Dell Latitude D600 (Pentium-M)
> laptop and I noticed a strange high-pitch noise comming from the laptop
> itself (that wasn't there with 2.4). The noise happens only when the CPU
> is idle. Also, I have noticed that removing thermal.o makes the noise
> stop, which is very odd. Is there anything that can be done about that?

I had the same problem with my Dell Latitude C600 and newer kernels with 
 HZ>100. The solution I found was to add "apm=idle-threshold=100" to 
the kernel commandline, to disable APM idle calls.

You should monitor the temperature of your laptop to make sure it 
doesn't spin wildly and create extra heat if you use the same solution.

Using ACPI instead of APM might also be a solution?

Troels

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/