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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+A
Date: Sat, 11 May 2024 15:22:23 +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 9:49 AM
+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 Thu, May 9 2024 at 09:10:51 AM -06:00:00, Lyndon Sanche
+AD4- +ADw-lsanche+AEA-lyndeno.ca+AD4- wrote:
+AD4- +AD4- On Wed, May 8, 2024, at 8:24 AM, Shen, Yijun wrote:
+AD4- +AD4APg-  Hi Lyndon,
+AD4- +AD4APg-
+AD4- +AD4APg-   Thanks for working on this patch.
+AD4- +AD4APg-
+AD4- +AD4APg-
+AD4- +AD4APg-   Dell side has an initial testing with this patch on some l=
aptops,
+AD4- +AD4APg- it  looks good. While changing the platform profile:
+AD4- +AD4APg-  1. The corresponding USTT option in BIOS will be changed.
+AD4- +AD4APg-  2. thermald will not be impacted. The related PSVT and ITMT=
 will be
+AD4- +AD4APg- loaded.
+AD4- +AD4APg-   Some Dell DTs does not have the USTT, Dell'll have a check=
 if
+AD4- +AD4APg- nothing  is broken.
+AD4- +AD4APg-
+AD4- +AD4APg-    Additional, with this patch, follow behavior is found:
+AD4- +AD4APg-   1. For example, the platform profile is quiet.
+AD4- +AD4APg-   2. Reboot the system and change the USTT to performance.
+AD4- +AD4APg-   3. Boot to desktop, the platform profile is +ACI-quiet+ACI=
-, the USTT will
+AD4- +AD4APg- be  changed back to +ACI-quiet+ACI-.
+AD4- +AD4APg-   This looks like not a proper user experience. The platform=
 profile
+AD4- +AD4APg- should honor the BIOS setting, aka, the platform profile sho=
uld be
+AD4- +AD4APg- switched to +ACI-performance+ACI-.
+AD4- +AD4-
+AD4- +AD4- Hello:
+AD4- +AD4-
+AD4- +AD4- Thank you for your email. This is definitely undesirable behavi=
our, I
+AD4- +AD4- will have a look at the code to see why this is happening. Does=
 it
+AD4- +AD4- always revert to quiet on boot, or always the mode that you had
+AD4- +AD4- switched to prior to reboot?
+AD4- +AD4-
+AD4- +AD4- Do you happen to have power-profiles-daemon or something simila=
r
+AD4- +AD4- running? My understanding is it remembers profiles across reboo=
ts,
+AD4- +AD4- this could potentially also revert the profile back to what it =
was.
+AD4- +AD4- See this release for details:
+AD4- +AD4- https://urldefense.com/v3/+AF8AXw-https://gitlab.freedesktop.or=
g/upower/powe
+AD4- +AD4- r-profiles-daemon/-/releases/0.9.0+AF8AXwA7ACEAIQ-LpKI+ACE-jUAE=
Hb-9foumkcmPlEKD6tnQrZ
+AD4- +AD4- sqjB1sXdPDsYvH2fJ-gPV6G35MUtDW4q3xhlJ4IeLcIgmVpb3ztXqaOg8+ACQ-
+AD4- +AD4- +AFs-gitlab+AFs-.+AF0-freedesktop+AFs-.+AF0-org+AF0-
+AD4- +AD4-
+AD4- +AD4- I will assume there is a bug in my code at this point. I will t=
est
+AD4- +AD4- with and without ppd running on my system to see if it changes =
across
+AD4- +AD4- reboots.
+AD4- +AD4-
+AD4- +AD4- Are USTT settings exposed in your BIOS configuration menu? On m=
y
+AD4- +AD4- laptop they are not and I have to use smbios-thermal-ctl.
+AD4- +AD4-
+AD4- +AD4- Thank you,
+AD4- +AD4-
+AD4- +AD4- Lyndon
+AD4-
+AD4- Hi Yijun:
+AD4-
+AD4- I tested this on my computer (XPS 9560). I do not have access to the =
USTT
+AD4- settings in the BIOS screen so to substitute that, I booted without t=
he patch
+AD4- and set the USTT manually using smbios-thermal-ctl.
+AD4- Here are my findings:
+AD4-
+AD4- Scenario +ACM-1: Without power-profiles-daemon (ppd) running
+AD4-
+AD4- 1. Boot with patch, set platform+AF8-profile to quiet 2. Boot without=
 patch applied
+AD4- (no platform+AF8-profile)
+AD4-  - smbios-thermal-ctl confirms USTT is set to quiet
+AD4-  - use smbios-thermal-ctl to set USTT to performance
+AD4-  - confirm set to performance
+AD4- 3. Boot with patch again
+AD4-  - platform+AF8-profile is set to performance
+AD4-
+AD4- Scenario +ACM-2: With ppd running
+AD4- 1. Boot with patch, set platform+AF8-profile to performance with ppd
+AD4-  - Confirm platform+AF8-profile is performance 2. Boot without patch =
applied (no
+AD4- platform+AF8-profile)
+AD4-  - smbios-thermal-ctl confirms USTT is set to performance
+AD4-  - ppd reverts to balanced (only controlling intel+AF8-pstate in this=
 case)
+AD4-  - use smbios-thermal-ctl to set USTT to quiet
+AD4-  - confirm set to quiet
+AD4- 3. Boot with patch again
+AD4-  - platform+AF8-profile and ppd is set to performance
+AD4-
+AD4- In my case, the setting in the smbios is honored if it was switched w=
ith
+AD4- another method. When using a userspace program that manipulates the
+AD4- platform+AF8-profile, the program seems to remember the previous stat=
e and
+AD4- switch to that.
+AD4-
+AD4- So I do not think there is a bug in this patch related to this issue,=
 at least in my
+AD4- case. Please let me know if you have any questions.
+AD4-
+AD4- Thanks,
+AD4-
+AD4- Lyndon
+AD4-
+AD4-
+AD4-
Hi Lyndon,

 I've made a video recorder of the issue: https://dell.box.com/s/3f3znz1z8c=
6htbcll9juj6tyyu0zvvut
 My test environment is that I freshly installed the Fedora 40 and will not=
 do any online updates. Then install the kernel with the v5 patch applied.

 XPS 9560 is a pretty old system which is RTS with 2017. No USTT setting in=
 the BIOS is expected.
 I've a check that the Dell system, at least shipped from 2022, the USTT se=
tting will be valid in the BIOS. The system used in above link, it is Latit=
ude 7350 which is shipped by 2024 April.

 I think the key point to duplicate of this issue that, the USTT needs to b=
e changed under BIOS but not under the Linux OS.

Thanks