Intel Pentium M

This guide is about the Intel Pentium M processors.

Cflags
See the Intel Safe CFlags article.

CPU Frequency Scaling
See the CPU Frequency Scaling guide.

ACPI Processor P-States driver

Microcode Update
See the Intel Microcode guide.

Undervolting
See the Pentium M Undervolting guide.

High-pitched noise coming from the processor
Many people have reported high-pitched noise coming from the processor. Usually, this noise becomes more pronounced after a suspend-resume cycle. The noise itself is generated by the processor entering energy-saving idle states. The ACPI standard allows for several, with a higher number being a more energy-conserving state. The noise seems to come from the states 3 and 4. Therefore, by locking it in state 2, you can eliminate the noise.

You can do that by passing a kernel parameter or setting a module parameter, depending on wether the acpi module "processor" is a loadable module or compiled into the kernel.

To do this, check that the kernel ACPI Processor driver is activated:


 * If compiled into the kernel, add processor.max_cstate=2 to your grub.conf or lilo.conf:


 * If compiled as module, add options processor max_cstate=2 to /etc/modprobe.d/processor and run update-modules:

Intel Pentium M