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Date:   Thu, 27 Jul 2023 21:25:19 +0700
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To:     Amit Daniel Kachhap <amit.kachhap@gmail.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        Goran <goran.brkuljan@gmail.com>
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Regressions <regressions@lists.linux.dev>,
        Linux Power Management <linux-pm@vger.kernel.org>
From:   Bagas Sanjaya <bagasdotme@gmail.com>
Subject: Fwd: XPS 17 9730 runs significantly warmer on Kernel 6.5-rc3 compared
 to Kernel 6.4.3
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Hi,

I notice a regression report on Bugzilla [1]. Quoting from it:

> On my new XPS 17 9730 laptop, I recently installed the Kernel 6.5-rc3. I noticed, however, that during its operation, the laptop was getting significantly warmer than before. I did some analysis using the 'stress' tool to measure and compare the difference in CPU temperatures between Kernel 6.4.3 and Kernel 6.5-rc3. Here are my results:
> 
> OS: Ubuntu 23.10
> CPU: i7-13700H
> 
> kernel 6.4.3:
>                                                                                                                                                                                         
> Initial CPU temperature:
> coretemp-isa-0000
> Core 0:        +47.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 4:        +45.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 8:        +46.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 12:       +46.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 16:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 20:       +44.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 24:       +44.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 25:       +44.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 26:       +44.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 27:       +44.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 28:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 29:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 30:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 31:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
> Stressing CPU for 30 seconds...
> stress: info: [4858] dispatching hogs: 14 cpu, 0 io, 0 vm, 0 hdd
> stress: info: [4858] successful run completed in 30s
> CPU temperature immediately after stress test:
> coretemp-isa-0000
> Core 0:        +67.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 4:        +76.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 8:        +69.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 12:       +77.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 16:       +69.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 20:       +76.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 24:       +68.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 25:       +68.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 26:       +68.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 27:       +68.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 28:       +71.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 29:       +71.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 30:       +71.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 31:       +71.0°C  (high = +100.0°C, crit = +100.0°C)
> Test ended at: Tue Jul 25 01:10:16 PM CEST 2023
> 
> 
> kernel 6.5-rc-3:
> 
> Initial CPU temperature:
> coretemp-isa-0000
> Core 0:        +46.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 4:        +46.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 8:        +46.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 12:       +46.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 16:       +44.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 20:       +44.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 24:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 25:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 26:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 27:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 28:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 29:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 30:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 31:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
> Stressing CPU for 30 seconds...
> stress: info: [11146] dispatching hogs: 14 cpu, 0 io, 0 vm, 0 hdd
> stress: info: [11146] successful run completed in 30s
> CPU temperature immediately after stress test:
> coretemp-isa-0000
> Core 0:        +84.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 4:        +97.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 8:        +87.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 12:      +100.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 16:       +86.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 20:       +99.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 24:       +83.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 25:       +83.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 26:       +83.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 27:       +83.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 28:       +89.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 29:       +89.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 30:       +89.0°C  (high = +100.0°C, crit = +100.0°C)
> Core 31:       +89.0°C  (high = +100.0°C, crit = +100.0°C)
> Test ended at: Tue Jul 25 01:05:42 PM CEST 2023
> 
> I tested few times with different setup and CPU temp on 6.5-rc3 is always higher especially when stressing with fewer cores.

See Bugzilla for the full thread.

Goran: On Tuesday, I asked you to perform bisection. Any update on it?

Anyway, I'm adding this regression to regzbot:

#regzbot introduced: v6.4..v6.5-rc3 https://bugzilla.kernel.org/show_bug.cgi?id=217703
#regzbot title: significant temperature increase on XPS 17 9730

Thanks.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=217703

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An old man doll... just what I always wanted! - Clara