Kernel 5.8.1 now on Stable

Lounge
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we have also a report

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Interesting. I have a Kaby Lake i5-8250U laptop on manjaro latest stable with 5.8.1 and everything is fine (powersave & performance, no throttling on powersave). And as I said, Iā€™m 99.9% sure the desktop (EOS) was fine on 5.8.1 and 5.8.2, here it started with 5.8.3.

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Biggest Kernel releaseā€¦
Kinda what i expected, biggest amount of problems :sweat_smile:

KISS Tux :penguin:, KISS :kiss:

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OK, from my limited understanding looking at the code - and this is the first C code I tried to read in 20 years: [1] changes the intel_pstate driver so that everything before Broadwell isnā€™t running intel_pstate but intel_cpufreq.

The good news: thereā€™s an undocumented intel_pstate=active which brings back intel_pstate.

PS: Thereā€™s also heavy refactoring going on for 5.9 which seems to affect Broadwell and older. [edit] There it also documents the new behavior (ā€œoptionalā€) [2]:

Active Mode Without HWP
This operation mode is optional for processors that do not support the HWP feature or when the intel_pstate=no_hwp argument is passed to the kernel in the command line. The active mode is used in those cases if the intel_pstate=active argument is passed to the kernel in the command line.

HWP is supported in Skylake and later.

[1] https://github.com/torvalds/linux/commit/39a188b88332545073b8e07633f5e3298e066b61
[2] https://github.com/torvalds/linux/blob/master/Documentation/admin-guide/pm/intel_pstate.rst#active-mode-without-hwp

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5.8.4 is in the repo!

5.8.5: Hold my beer ā€¦

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