Comment 24 for bug 206864

I've also heard you can modify the grub config, but that requires rebooting,
and if you're going to reboot, at least on my Lenovo T500, you can disable
higher cstate via a BIOS setting (I think it's under config -> power -> cpu
power management).

I rarely reboot my machine and instead using suspend/resume. It'd be much
more handy if you could change the cstate at runtime.

On Fri, Mar 27, 2009 at 12:32 AM, Peter Bui <email address hidden> wrote:

> Apparently, you can add 'processor.max_cstate=2' to the kernel line in
> you grub config and this will work in setting the max_cstate and thus
> prevent the annoying whine.
>
> --
> Unable to set max_cstate on hardy kernel
> https://bugs.launchpad.net/bugs/206864
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in “linux” source package in Ubuntu: Triaged
>
> Bug description:
> On earlier kernels I could set the max_cstat to get rid of the
> hissing/whining noise from the CPU when idle.
> echo 2 > /sys/module/processor/parameters/max_cstate
>
> This don't work any mor, and I have not found a solution to this annoying
> noise from thr CPU
>
> Dell D610 1.6Ghz, 1024RAM, hardy kernel
>