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From:   "Limonciello, Mario" <Mario.Limonciello@dell.com>
To:     Elia Devito <eliadevito@gmail.com>,
        Hans de Goede <hdegoede@redhat.com>,
        "Rafael J. Wysocki" <rafael@kernel.org>
CC:     "Rafael J. Wysocki" <rafael@kernel.org>,
        Bastien Nocera <hadess@hadess.net>,
        Darren Hart <dvhart@infradead.org>,
        Andy Shevchenko <andy@infradead.org>,
        Mark Gross <mgross@linux.intel.com>,
        Mark Pearson <mpearson@lenovo.com>,
        Benjamin Berg <bberg@redhat.com>,
        "linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
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        "platform-driver-x86@vger.kernel.org" 
        <platform-driver-x86@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Mark Pearson <markpearson@lenovo.com>,
        Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Subject: RE: [RFC] Documentation: Add documentation for new
 performance_profile sysfs class
Thread-Topic: [RFC] Documentation: Add documentation for new
 performance_profile sysfs class
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Date:   Wed, 14 Oct 2020 18:11:03 +0000
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> As far as I know, the profiles affect  the thermal behavior like "how lon=
g to
> wait before starting the fan and at what temperature" or "how fast to run=
 the
> fan with the current cpu load and temperature".
>=20
> The only way that firmware uses to "control" performance should be the od=
vp0
> DPTF variable.
>=20
> On Windows HP expose  both "Cool" and "Quiet" profile respectively as "Id=
eal
> for when the computer feels warm to the touch" and "Ideal for quiet
> environments".
>=20
> more detail: https://support.hp.com/in-en/document/c06063108
>=20
> To be precise "Quiet" profile should be available only on platform withou=
t
> dedicate GPU (I'm investigating if there is other case), instead the othe=
r 3
> profiles ("HP Recommended", "Performance" and "Cool") are available on al=
l
> platform that support thermal profile.
>=20
> reading here seems that Dell offer identical profiles:
> https://www.dell.com/support/manuals/it/it/itbsdt1/dell-command-power-man=
ager-
> v2.2/userguide_dell/thermal-management?guid=3Dguid-c05d2582-fc07-4e3e-918=
a-
> 965836d20752&lang=3Den-us
>=20

The Dell profiles here I don't think should be conflated with DTT/DPTF thou=
gh.
These won't affect anything in the DTT vault.

Those profiles are already accessible from Linux userland, there is already=
 a
command line tool in libsmbios that can do it.

$ sudo smbios-thermal-ctl -i
Libsmbios version : 2.4.3
smbios-thermal-ctl version : 2.4.3

 Print all the Available Thermal Information of your system:
-------------------------------------------------------------------

Supported Thermal Modes:
         Balanced
         Cool Bottom
         Quiet
         Performance

Supported Active Acoustic Controller (AAC) modes:

Supported AAC Configuration type:
        Global (AAC enable/disable applies to all supported USTT modes)\

$ sudo smbios-thermal-ctl -g
Helper function to Get current Thermal Mode settings

 Print Current Status of Thermal Information:
-------------------------------------------------------------------

Current Thermal Modes:
         Balanced

Current Active Acoustic Controller (AAC) Mode:
         AAC mode Disabled

Current Active Acoustic Controller (AAC) Mode:
        Global (AAC enable/disable applies to all supported USTT modes)

---
*If* we choose to export them for Dell from the kernel, we should probably =
also
filter from kernel side and modify the existing userspace tool to use the k=
ernel
API when possible.

I'm not convinced that Dell would want to tie into this proposed knob with =
those
settings because I expect that existing software like thermald will not wor=
k as
efficiently.