linux-kernel - Re: [PATCH] platform/x86: dell-laptop: Implement platform

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Date: Thu, 25 Apr 2024 14:51:42 -0700
From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To: Mario Limonciello <mario.limonciello@....com>,
 Lyndon Sanche <lsanche@...deno.ca>
Cc: Matthew Garrett <mjg59@...f.ucam.org>, Pali Rohár
 <pali@...nel.org>, Hans de Goede <hdegoede@...hat.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
 Dell.Client.Kernel@...l.com
Subject: Re: [PATCH] platform/x86: dell-laptop: Implement platform_profile


On 4/25/24 13:28, Mario Limonciello wrote:
> On 4/25/2024 15:24, Lyndon Sanche wrote:
>> On Thu, Apr 25, 2024, at 2:07 PM, Mario Limonciello wrote:
>>> + Srinivas
>>>
>>> On 4/25/2024 12:27, Lyndon Sanche wrote:
>>>> Some Dell laptops support configuration of preset
>>>> fan modes through smbios tables.
>>>>
>>>> If the platform supports these fan modes, set up
>>>> platform_profile to change these modes. If not
>>>> supported, skip enabling platform_profile.
>>>>
>>>> Signed-off-by: Lyndon Sanche <lsanche@...deno.ca>
>>>> ---
>>>
>>> When you developed this was it using a Dell Intel or Dell AMD system?
>>>
>>> If it was an Intel system, did you test it with thermald installed and
>>> active?
>>>
>>> I'm wondering how all this stuff jives with the stuff that thermald
>>> does.  I don't know if they fight for any of the same "resources".
>>
>> Thank you for your response.
>>
>> I did my development and testing on a Dell Intel system. Specifically 
>> the XPS 15 9560 with i7-7700HQ.
>>
>> I do have thermald running, though I admit I am not really aware of 
>> what exactly it does, besides being related to thermals in some way.
>>
>> I normally set the thermal mode with Dell's smbios-thermal-ctl 
>> program. I am not too sure all the values that the bios configures on 
>> it's own depending on the provided mode, so I am not sure if thermald 
>> conflicts. But my understanding is that would be out of scope of this 
>> driver, since we are only telling the bios what we want at a high level.
>>
>> Lyndon
>
> Yeah it's not say it's a "new" conflict, it would just become a lot 
> more prevalent since software like GNOME and KDE use 
> power-profiles-daemon to manipulate the new power profile you're 
> exporting from the driver.
>
> If there really is no conflict, then great!
> If there is a conflict then I was just wondering if there needs to be 
> an easy way to turn on/off the profile support when thermald is in use.

This shouldn't be in conflict as this should be directly changing some 
settings in BIOS. BIOS should send some notification, if it wants some 
changes in thermal tables used by thermald.


Thanks,

Srinivas