Fwd: XPS 17 9730 runs significantly warmer on Kernel 6.5-rc3 compared to Kernel 6.4.3
From: Bagas Sanjaya
Date: Thu Jul 27 2023 - 10:25:45 EST
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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