high-pitched whine on x60/t60

[The Gluglug]

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So far we have workarounds (idle=halt or processor.max_cstate=2 kernel
parameter, or 'powertop --auto-tune').

I am fully aware that these are workarounds, not solutions.

A libreboot user also reported that the following programme can be
used (in the same way as powertop):
https://wiki.archlinux.org/index.php/TLP

Might be worth looking into.
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[Nico Huber]

Hi folks,

I haven't followed the previous discussion on this matter, so one
question: Is this a coreboot issue? If this noise doesn't occur with
the vendor firmware, has anybody checked if coreboot uses the same
power management timing settings? (e.g. C4-TIMING_CNT, see [1], there
might be more such settings not mentioned in the public datasheet)

Regards,
Nico

[1] Intel I/O Controller Hub 7 (ICH7) Family Datasheet
     Document Number: 307013-003

[Peter Stuge]

Nico Huber wrote:
> Is this a coreboot issue?

Partially.
> has anybody checked if coreboot uses the same power management
> timing settings?

No, but I'm quite sure that it does not.

//Peter

[ron minnich]

These power supply issues are quite fun, like other things. The mistake
would be to say that, because there is noise, coreboot is wrong and vendor
firmware is right. It can be far more subtle than that. It could even be
the case that coreboot is right, the vendor code is wrong, and the
correction is eliciting noise because coreboot has revealed some other
problem.

I can't tell you how many times we've looked at, e.g., u-boot for some ARM,
realized we had no idea why the code in question (vendor code) ever worked,
and fixed it. And found some other issue, somewhere else, because of the
fix.

ron

[Charles Devereaux]

On https://wiki.archlinux.org/index.php/TLP:
"tp-smapi is needed for battery charge thresholds"

That would be something interesting to tweak - without tp-smapi, which is
not supported at the moment

On Tue, Jul 22, 2014 at 9:37 AM, The Gluglug  wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> So far we have workarounds (idle=halt or processor.max_cstate=2 kernel
> parameter, or 'powertop --auto-tune').
>
> I am fully aware that these are workarounds, not solutions.
>
> A libreboot user also reported that the following programme can be
> used (in the same way as powertop):
> https://wiki.archlinux.org/index.php/TLP
>
> Might be worth looking into.
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> Version: GnuPG v1.4.11 (GNU/Linux)
> Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/
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