Re: Fwd: XPS 17 9730 runs significantly warmer on Kernel 6.5-rc3 compared to Kernel 6.4.3

[Thorsten Leemhuis]

On 28.07.23 20:13, Goran Brkuljan wrote:
> Hi Everyone,

Please don't sent HTML mail to Linux kernel lists, it often will be
rejected.

>     Goran: On Tuesday, I asked you to perform bisection. Any update on it?
> 
>  
> Sorry for the delayed response. I wasn't able to do git bisection as I
> was quite busy this week. 
> 
> However, I am no longer convinced that there is a kernel related issue.
> I reinstalled both kernels and now I get consistent results between two,
> and they both return higher values.
> Now on both kernels, core20 spikes to +100.0°C and it stays there for
> the duration of the test. Other cores are going from 80-95°C.
>
> Note that I used the mainline kernel installer for handling installation. 

FWIW, I (and likely many others that read this) have no idea what
(distro specifc?) tool you are talking about. But I guess that doesn't
matter. :-D

> I would close the issue as tests and behaviour don't suggest significant
> differences between kernel versions. 

Okydo, thx for the update.

#regzbot resolve: notabug: seems everything is working fine

Ciao, Thorsten

> On Fri, Jul 28, 2023 at 3:42 PM Thorsten Leemhuis
> <regressions@xxxxxxxxxxxxx <mailto:regressions@xxxxxxxxxxxxx>> wrote:
> 
>     [CCing Thermal maintainer Rafael, maybe he can help guide us]
> 
>     Hi Bagas and everyone!
> 
>     On 27.07.23 16:24, Bagas Sanjaya wrote:
>     >
>     > I notice a regression report on Bugzilla [1].
> 
>     Bagas, it looks like you forwarded this to the maintainers of
>     "THERMAL/CPU_COOLING"; I think "THERMAL" would have been the way better
>     entry in MAINTAINERS, as many (all?) of the former are Linaro employees
>     and thus primarily care about ARM based devices. That's why I CCed
>     Rafael.
> 
>     > 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:
> 
>     One thought: I wonder if there something wrong now or was there
>     something wrong earlier that was fixed to unleash the full performance
>     potential of the device. That 100°C there sounds like it's the latter
>     case, as that's the TJUNCTION temp for that processor. But would be good
>     to confirm from someone that knows better how hot such processors are
>     allowed to get these days.
> 
>     Ciao, Thorsten
> 
>     >> 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
>     <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
>     <https://bugzilla.kernel.org/show_bug.cgi?id=217703>
>     >
>