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From: "Shen, Yijun" <Yijun.Shen@dell.com>
To: Lyndon Sanche <lsanche@lyndeno.ca>
CC: Mario Limonciello <mario.limonciello@amd.com>,
        =?utf-7?B?UGFsaSBSb2grQU9FLXI=?= <pali@kernel.org>,
        Armin Wolf
	<W_Armin@gmx.de>,
        "srinivas.pandruvada@linux.intel.com"
	<srinivas.pandruvada@linux.intel.com>,
        =?utf-7?B?SWxwbyBKK0FPUS1ydmluZW4=?=
	<ilpo.jarvinen@linux.intel.com>,
        kernel test robot <lkp@intel.com>,
        Hans de
 Goede <hdegoede@redhat.com>,
        Matthew Garrett <mjg59@srcf.ucam.org>,
        Jonathan
 Corbet <corbet@lwn.net>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Vegard
 Nossum <vegard.nossum@oracle.com>,
        "platform-driver-x86@vger.kernel.org"
	<platform-driver-x86@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Dell Client Kernel <Dell.Client.Kernel@dell.com>
Subject: RE: [PATCH v5] platform/x86: dell-laptop: Implement platform_profile
Thread-Topic: [PATCH v5] platform/x86: dell-laptop: Implement platform_profile
Thread-Index: 
 AQHanBLh5VIydjU6UEi/YU1qu3GPk7GNIdqggAHsKICAAkSsgIAA3t+AgAANP4CAAAHoAA==
Date: Sat, 11 May 2024 16:12:59 +0000
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Internal Use - Confidential
+AD4- -----Original Message-----
+AD4- From: Lyndon Sanche +ADw-lsanche+AEA-lyndeno.ca+AD4-
+AD4- Sent: Saturday, May 11, 2024 11:54 PM
+AD4- To: Shen, Yijun +ADw-Yijun+AF8-Shen+AEA-Dell.com+AD4-
+AD4- Cc: Mario Limonciello +ADw-mario.limonciello+AEA-amd.com+AD4AOw- Pali=
 Roh+AOE-r
+AD4- +ADw-pali+AEA-kernel.org+AD4AOw- Armin Wolf +ADw-W+AF8-Armin+AEA-gmx.=
de+AD4AOw-
+AD4- srinivas.pandruvada+AEA-linux.intel.com+ADs- Ilpo J+AOQ-rvinen
+AD4- +ADw-ilpo.jarvinen+AEA-linux.intel.com+AD4AOw- kernel test robot +ADw=
-lkp+AEA-intel.com+AD4AOw- Hans de
+AD4- Goede +ADw-hdegoede+AEA-redhat.com+AD4AOw- Matthew Garrett +ADw-mjg59=
+AEA-srcf.ucam.org+AD4AOw-
+AD4- Jonathan Corbet +ADw-corbet+AEA-lwn.net+AD4AOw- Heiner Kallweit
+AD4- +ADw-hkallweit1+AEA-gmail.com+AD4AOw- Vegard Nossum +ADw-vegard.nossu=
m+AEA-oracle.com+AD4AOw-
+AD4- platform-driver-x86+AEA-vger.kernel.org+ADs- LKML +ADw-linux-kernel+A=
EA-vger.kernel.org+AD4AOw-
+AD4- Dell Client Kernel +ADw-Dell.Client.Kernel+AEA-dell.com+AD4-
+AD4- Subject: RE: +AFs-PATCH v5+AF0- platform/x86: dell-laptop: Implement =
platform+AF8-profile
+AD4-
+AD4-
+AD4- +AFs-EXTERNAL EMAIL+AF0-
+AD4-
+AD4-
+AD4-
+AD4- On May 11, 2024 9:22:23+IC8-a.m. MDT, +ACI-Shen, Yijun+ACI- +ADw-Yiju=
n.Shen+AEA-dell.com+AD4-
+AD4- wrote:
+AD4- +AD4-
+AD4- +AD4-
+AD4- +AD4-
+AD4- +AD4-Internal Use - Confidential
+AD4- +AD4APg- -----Original Message-----
+AD4- +AD4APg- From: Lyndon Sanche +ADw-lsanche+AEA-lyndeno.ca+AD4-
+AD4- +AD4APg- Sent: Saturday, May 11, 2024 9:49 AM
+AD4- +AD4APg- To: Shen, Yijun +ADw-Yijun+AF8-Shen+AEA-Dell.com+AD4-
+AD4- +AD4APg- Cc: Mario Limonciello +ADw-mario.limonciello+AEA-amd.com+AD4=
AOw- Pali Roh+AOE-r
+AD4- +AD4APg- +ADw-pali+AEA-kernel.org+AD4AOw- Armin Wolf +ADw-W+AF8-Armin=
+AEA-gmx.de+AD4AOw-
+AD4- +AD4APg- srinivas.pandruvada+AEA-linux.intel.com+ADs- Ilpo J+AOQ-rvin=
en
+AD4- +AD4APg- +ADw-ilpo.jarvinen+AEA-linux.intel.com+AD4AOw- kernel test r=
obot +ADw-lkp+AEA-intel.com+AD4AOw-
+AD4- +AD4APg- Hans de Goede +ADw-hdegoede+AEA-redhat.com+AD4AOw- Matthew G=
arrett
+AD4- +AD4APg- +ADw-mjg59+AEA-srcf.ucam.org+AD4AOw- Jonathan Corbet +ADw-co=
rbet+AEA-lwn.net+AD4AOw- Heiner
+AD4- +AD4APg- Kallweit +ADw-hkallweit1+AEA-gmail.com+AD4AOw- Vegard Nossum
+AD4- +AD4APg- +ADw-vegard.nossum+AEA-oracle.com+AD4AOw- platform-driver-x8=
6+AEA-vger.kernel.org+ADs-
+AD4- LKML
+AD4- +AD4APg- +ADw-linux-kernel+AEA-vger.kernel.org+AD4AOw- Dell Client Ke=
rnel
+AD4- +AD4APg- +ADw-Dell.Client.Kernel+AEA-dell.com+AD4-
+AD4- +AD4APg- Subject: Re: +AFs-PATCH v5+AF0- platform/x86: dell-laptop: I=
mplement
+AD4- +AD4APg- platform+AF8-profile
+AD4- +AD4APg-
+AD4- +AD4APg-
+AD4- +AD4APg- +AFs-EXTERNAL EMAIL+AF0-
+AD4- +AD4APg-
+AD4- +AD4APg-
+AD4- +AD4APg-
+AD4- +AD4APg- On Thu, May 9 2024 at 09:10:51 AM -06:00:00, Lyndon Sanche
+AD4- +AD4APg- +ADw-lsanche+AEA-lyndeno.ca+AD4- wrote:
+AD4- +AD4APg- +AD4- On Wed, May 8, 2024, at 8:24 AM, Shen, Yijun wrote:
+AD4- +AD4APg- +AD4APg-  Hi Lyndon,
+AD4- +AD4APg- +AD4APg-
+AD4- +AD4APg- +AD4APg-   Thanks for working on this patch.
+AD4- +AD4APg- +AD4APg-
+AD4- +AD4APg- +AD4APg-
+AD4- +AD4APg- +AD4APg-   Dell side has an initial testing with this patch =
on some
+AD4- +AD4APg- +AD4APg- laptops, it  looks good. While changing the platfor=
m profile:
+AD4- +AD4APg- +AD4APg-  1. The corresponding USTT option in BIOS will be c=
hanged.
+AD4- +AD4APg- +AD4APg-  2. thermald will not be impacted. The related PSVT=
 and ITMT will
+AD4- +AD4APg- +AD4APg- be loaded.
+AD4- +AD4APg- +AD4APg-   Some Dell DTs does not have the USTT, Dell'll hav=
e a check if
+AD4- +AD4APg- +AD4APg- nothing  is broken.
+AD4- +AD4APg- +AD4APg-
+AD4- +AD4APg- +AD4APg-    Additional, with this patch, follow behavior is =
found:
+AD4- +AD4APg- +AD4APg-   1. For example, the platform profile is quiet.
+AD4- +AD4APg- +AD4APg-   2. Reboot the system and change the USTT to perfo=
rmance.
+AD4- +AD4APg- +AD4APg-   3. Boot to desktop, the platform profile is +ACI-=
quiet+ACI-, the USTT
+AD4- +AD4APg- +AD4APg- will be  changed back to +ACI-quiet+ACI-.
+AD4- +AD4APg- +AD4APg-   This looks like not a proper user experience. The=
 platform
+AD4- +AD4APg- +AD4APg- profile should honor the BIOS setting, aka, the pla=
tform profile
+AD4- +AD4APg- +AD4APg- should be switched to +ACI-performance+ACI-.
+AD4- +AD4APg- +AD4-
+AD4- +AD4APg- +AD4- Hello:
+AD4- +AD4APg- +AD4-
+AD4- +AD4APg- +AD4- Thank you for your email. This is definitely undesirab=
le behaviour,
+AD4- +AD4APg- +AD4- I will have a look at the code to see why this is happ=
ening. Does
+AD4- +AD4APg- +AD4- it always revert to quiet on boot, or always the mode =
that you had
+AD4- +AD4APg- +AD4- switched to prior to reboot?
+AD4- +AD4APg- +AD4-
+AD4- +AD4APg- +AD4- Do you happen to have power-profiles-daemon or somethi=
ng similar
+AD4- +AD4APg- +AD4- running? My understanding is it remembers profiles acr=
oss reboots,
+AD4- +AD4APg- +AD4- this could potentially also revert the profile back to=
 what it was.
+AD4- +AD4APg- +AD4- See this release for details:
+AD4- +AD4APg- +AD4- https://urldefense.com/v3/+AF8AXw-https://gitlab.freed=
esktop.org/upower/p
+AD4- +AD4APg- +AD4- owe
+AD4- +AD4APg- +AD4- r-profiles-daemon/-/releases/0.9.0+AF8AXwA7ACEAIQ-LpKI=
+ACE-jUAEHb-9foumkcmPlEKD6tn
+AD4- +AD4APg- +AD4- QrZ sqjB1sXdPDsYvH2fJ-
+AD4- gPV6G35MUtDW4q3xhlJ4IeLcIgmVpb3ztXqaOg8+ACQ-
+AD4- +AD4APg- +AD4- +AFs-gitlab+AFs-.+AF0-freedesktop+AFs-.+AF0-org+AF0-
+AD4- +AD4APg- +AD4-
+AD4- +AD4APg- +AD4- I will assume there is a bug in my code at this point.=
 I will test
+AD4- +AD4APg- +AD4- with and without ppd running on my system to see if it=
 changes
+AD4- +AD4APg- +AD4- across reboots.
+AD4- +AD4APg- +AD4-
+AD4- +AD4APg- +AD4- Are USTT settings exposed in your BIOS configuration m=
enu? On my
+AD4- +AD4APg- +AD4- laptop they are not and I have to use smbios-thermal-c=
tl.
+AD4- +AD4APg- +AD4-
+AD4- +AD4APg- +AD4- Thank you,
+AD4- +AD4APg- +AD4-
+AD4- +AD4APg- +AD4- Lyndon
+AD4- +AD4APg-
+AD4- +AD4APg- Hi Yijun:
+AD4- +AD4APg-
+AD4- +AD4APg- I tested this on my computer (XPS 9560). I do not have acces=
s to the
+AD4- +AD4APg- USTT settings in the BIOS screen so to substitute that, I bo=
oted
+AD4- +AD4APg- without the patch and set the USTT manually using smbios-the=
rmal-ctl.
+AD4- +AD4APg- Here are my findings:
+AD4- +AD4APg-
+AD4- +AD4APg- Scenario +ACM-1: Without power-profiles-daemon (ppd) running
+AD4- +AD4APg-
+AD4- +AD4APg- 1. Boot with patch, set platform+AF8-profile to quiet 2. Boo=
t without
+AD4- +AD4APg- patch applied (no platform+AF8-profile)
+AD4- +AD4APg-  - smbios-thermal-ctl confirms USTT is set to quiet
+AD4- +AD4APg-  - use smbios-thermal-ctl to set USTT to performance
+AD4- +AD4APg-  - confirm set to performance
+AD4- +AD4APg- 3. Boot with patch again
+AD4- +AD4APg-  - platform+AF8-profile is set to performance
+AD4- +AD4APg-
+AD4- +AD4APg- Scenario +ACM-2: With ppd running
+AD4- +AD4APg- 1. Boot with patch, set platform+AF8-profile to performance =
with ppd
+AD4- +AD4APg-  - Confirm platform+AF8-profile is performance 2. Boot witho=
ut patch
+AD4- +AD4APg- applied (no
+AD4- +AD4APg- platform+AF8-profile)
+AD4- +AD4APg-  - smbios-thermal-ctl confirms USTT is set to performance
+AD4- +AD4APg-  - ppd reverts to balanced (only controlling intel+AF8-pstat=
e in this
+AD4- +AD4APg- case)
+AD4- +AD4APg-  - use smbios-thermal-ctl to set USTT to quiet
+AD4- +AD4APg-  - confirm set to quiet
+AD4- +AD4APg- 3. Boot with patch again
+AD4- +AD4APg-  - platform+AF8-profile and ppd is set to performance
+AD4- +AD4APg-
+AD4- +AD4APg- In my case, the setting in the smbios is honored if it was s=
witched
+AD4- +AD4APg- with another method. When using a userspace program that man=
ipulates
+AD4- +AD4APg- the platform+AF8-profile, the program seems to remember the =
previous
+AD4- +AD4APg- state and switch to that.
+AD4- +AD4APg-
+AD4- +AD4APg- So I do not think there is a bug in this patch related to th=
is issue,
+AD4- +AD4APg- at least in my case. Please let me know if you have any ques=
tions.
+AD4- +AD4APg-
+AD4- +AD4APg- Thanks,
+AD4- +AD4APg-
+AD4- +AD4APg- Lyndon
+AD4- +AD4APg-
+AD4- +AD4APg-
+AD4- +AD4APg-
+AD4- +AD4-Hi Lyndon,
+AD4- +AD4-
+AD4- +AD4- I've made a video recorder of the issue:
+AD4- +AD4-
+AD4- https://urldefense.com/v3/+AF8AXw-https://dell.box.com/s/3f3znz1z8c6h=
tbcll9juj6ty
+AD4- yu0zvvut+AF8AXwA7ACEAIQ-LpKI+ACE-nHHxFbxzG-rJX+AF8-KZsebMC7ZcJU0WhNhk=
pXn-pk6nu-sUF38-
+AD4- RXz6x3YkALgzS4jnUP9TIWIu4mX+AF8-6cSDbwQ+ACQ- +AFs-dell+AFs-.+AF0-box+=
AFs-.+AF0-com+AF0- My test
+AD4- environment is that I freshly installed the Fedora 40 and will not do=
 any online
+AD4- updates. Then install the kernel with the v5 patch applied.
+AD4- +AD4-
+AD4- +AD4- XPS 9560 is a pretty old system which is RTS with 2017. No USTT=
 setting in
+AD4- the BIOS is expected.
+AD4- +AD4- I've a check that the Dell system, at least shipped from 2022, =
the USTT
+AD4- setting will be valid in the BIOS. The system used in above link, it =
is Latitude
+AD4- 7350 which is shipped by 2024 April.
+AD4- +AD4-
+AD4- +AD4- I think the key point to duplicate of this issue that, the USTT=
 needs to be
+AD4- changed under BIOS but not under the Linux OS.
+AD4- +AD4-
+AD4- +AD4-Thanks
+AD4- +AD4-
+AD4- +AD4-
+AD4-
+AD4-
+AD4- Thanks for the video.
+AD4-
+AD4- Fedora 40 has power-profiles-daemon enabled by default AFAIK. This wo=
uld
+AD4- be changing the platform profile at load to match the last known stat=
e.
+AD4-
+AD4- Are you able to rerun this test with PPD disabled? Just in case it is=
 a difference
+AD4- between setting it in BIOS and smbios-thermal-ctl.
+AD4-
+AD4- Thanks,
+AD4-
+AD4- Lyndon

 If disable the PPD, the issue is gone.

Thanks