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Date:   Fri, 28 Jul 2023 08:31:12 +0700
From:   Bagas Sanjaya <bagasdotme@gmail.com>
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>
Subject: Re: Fwd: XPS 17 9730 runs significantly warmer on Kernel 6.5-rc3
 compared to Kernel 6.4.3
Message-ID: <ZMMaYLcc5G4KSVyf@debian.me>
References: <4aaf1d3d-2ab7-2d3a-f597-a1741bf699d6@gmail.com>
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On Thu, Jul 27, 2023 at 09:25:19PM +0700, Bagas Sanjaya wrote:
> Hi,
>=20
> I notice a regression report on Bugzilla [1]. Quoting from it:
>=20
> > 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 signi=
ficantly 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:
> >=20
> > OS: Ubuntu 23.10
> > CPU: i7-13700H
> >=20
> > kernel 6.4.3:
> >                                                                        =
                                                                           =
                                     =20
> > Initial CPU temperature:
> > coretemp-isa-0000
> > Core 0:        +47.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 4:        +45.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 8:        +46.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 12:       +46.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 16:       +45.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 20:       +44.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 24:       +44.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 25:       +44.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 26:       +44.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 27:       +44.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 28:       +45.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 29:       +45.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 30:       +45.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 31:       +45.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > 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=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 4:        +76.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 8:        +69.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 12:       +77.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 16:       +69.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 20:       +76.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 24:       +68.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 25:       +68.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 26:       +68.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 27:       +68.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 28:       +71.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 29:       +71.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 30:       +71.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 31:       +71.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Test ended at: Tue Jul 25 01:10:16 PM CEST 2023
> >=20
> >=20
> > kernel 6.5-rc-3:
> >=20
> > Initial CPU temperature:
> > coretemp-isa-0000
> > Core 0:        +46.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 4:        +46.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 8:        +46.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 12:       +46.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 16:       +44.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 20:       +44.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 24:       +45.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 25:       +45.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 26:       +45.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 27:       +45.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 28:       +45.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 29:       +45.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 30:       +45.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 31:       +45.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > 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=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 4:        +97.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 8:        +87.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 12:      +100.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 16:       +86.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 20:       +99.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 24:       +83.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 25:       +83.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 26:       +83.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 27:       +83.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 28:       +89.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 29:       +89.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 30:       +89.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Core 31:       +89.0=C2=B0C  (high =3D +100.0=C2=B0C, crit =3D +100.0=
=C2=B0C)
> > Test ended at: Tue Jul 25 01:05:42 PM CEST 2023
> >=20
> > I tested few times with different setup and CPU temp on 6.5-rc3 is alwa=
ys higher especially when stressing with fewer cores.
>=20
> See Bugzilla for the full thread.
>=20
> Goran: On Tuesday, I asked you to perform bisection. Any update on it?
>=20
> Anyway, I'm adding this regression to regzbot:
>=20
> #regzbot introduced: v6.4..v6.5-rc3 https://bugzilla.kernel.org/show_bug.=
cgi?id=3D217703
> #regzbot title: significant temperature increase on XPS 17 9730
>=20
> Thanks.
>=20
> [1]: https://bugzilla.kernel.org/show_bug.cgi?id=3D217703
>=20

Oops, I accidentally duped this. My email client was stuck sending it
(but got delivered anyway), thus:

#regzbot dup-of: https://lore.kernel.org/regressions/107f05b8-0104-501c-130=
c-4f89f3f8a628@gmail.com/

--=20
An old man doll... just what I always wanted! - Clara

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