linux-kernel - 5.8.3: cpu power management seems to be broken, CPU stays at min fequency

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Date:   Fri, 21 Aug 2020 21:05:32 +0200
From:   Toralf Förster <toralf.foerster@....de>
To:     Linux PM list <linux-pm@...r.kernel.org>
Cc:     Linux Kernel <linux-kernel@...r.kernel.org>
Subject: 5.8.3: cpu power management seems to be broken, CPU stays at min
 fequency

5.7.x and below are fine since years, but the current kernel let the CPU idle at minimal freq.

t44 ~ # lscpu
Architecture:                    x86_64
CPU op-mode(s):                  32-bit, 64-bit
Byte Order:                      Little Endian
Address sizes:                   39 bits physical, 48 bits virtual
CPU(s):                          4
On-line CPU(s) list:             0-3
Thread(s) per core:              2
Core(s) per socket:              2
Socket(s):                       1
NUMA node(s):                    1
Vendor ID:                       GenuineIntel
CPU family:                      6
Model:                           69
Model name:                      Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz
Stepping:                        1
CPU MHz:                         798.132
CPU max MHz:                     2900.0000
CPU min MHz:                     800.0000
BogoMIPS:                        4988.30

The .config is attached.


--
Toralf

View attachment ".config" of type "text/plain" (119653 bytes)