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Intel Pentium M

This guide is about the Intel Pentium M processors.



See CFlags

Kernel Setup

Linux Kernel Configuration:
Processor type and features  --->
    Subarchitecture Type ()  --->
        (X) PC-compatible
    Processor family ()  --->
        (X) Pentium M
    [ ] Generic x86 support
    [ ] Symmetric multi-processing support
    [*] Machine Check Exception
    < >   Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4

CPU Frequency Scaling

See this guide.

Microcode Update

See this HowTo.


See this guide.


High-pitched noise coming from the processor

Note: All credits goes to the guys from

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:

Linux Kernel Configuration:
 Power management options  --->
     [*] Power Management support
     [*] ACPI (Advanced Configuration and Power Interface) Support  --->
         <*>   Processor
File: /boot/grub/grub.conf
 kernel path-to-kernel root=/dev/sdaX other-kernel-options processor.max_cstate=2
File: /etc/modprobe.d/processor
 options processor max_cstate=2
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Last modified: Sun, 24 Aug 2008 09:57:00 +0000 Hits: 1,264