[Bug 218759] 6.9-rc kernels - with Ryzen 7840HS CPU single core never boosts to max frequency

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218759

--- Comment #9 from Gaha (gahabana@gmail.com) ---
hi , thank you for the suggestions (@Mario), 
    I've just tried that as well. Single core workloads still do not go above
'basic' speeds. In addition to adding 'amd_prefcore=disable' below i've also
tried adding explicitly to kernel command line amd_pstate various parameters
(active, guided, passive) 'GRUB_CMDLINE_LINUX_DEFAULT="amd_pstate=guided
amd_prefcore=disable iommu=pt quiet " with no change in behaviour
zh@muc:~$ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-6.9.0-rc5-zh-250HZ-amdpatches+
root=UUID=dc0bb664-2e43-421d-bd28-96d0332f030c ro amd_prefcore=disable iommu=pt
quiet
zh@muc:~$ uname -a
Linux muc 6.9.0-rc5-zh-250HZ-amdpatches+ #5 SMP PREEMPT_DYNAMIC Thu Apr 25
11:45:21 CEST 2024 x86_64 x86_64 x86_64 GNU/Linux
... (In 2nd session am running 'cat /dev/zero >/dev/null')
zh@muc:~$ lscpu -ae
CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE    MAXMHZ   MINMHZ       MHZ
  0    0      0    0 0:0:0:0          yes 4350.0000 400.0000 1815.3290
  1    0      0    1 1:1:1:0          yes 4350.0000 400.0000 1724.5240
  2    0      0    2 2:2:2:0          yes 4350.0000 400.0000 2156.9199
  3    0      0    3 3:3:3:0          yes 4350.0000 400.0000  400.0000
  4    0      0    4 4:4:4:0          yes 4350.0000 400.0000  400.0000
  5    0      0    5 5:5:5:0          yes 4350.0000 400.0000 2050.2410
  6    0      0    6 6:6:6:0          yes 4350.0000 400.0000  400.0000
  7    0      0    7 7:7:7:0          yes 4350.0000 400.0000  400.0000
  8    0      0    0 0:0:0:0          yes 4350.0000 400.0000  400.0000
  9    0      0    1 1:1:1:0          yes 4350.0000 400.0000  400.0000
 10    0      0    2 2:2:2:0          yes 4350.0000 400.0000  400.0000
 11    0      0    3 3:3:3:0          yes 4350.0000 400.0000  400.0000
 12    0      0    4 4:4:4:0          yes 4350.0000 400.0000  400.0000
 13    0      0    5 5:5:5:0          yes 4350.0000 400.0000  400.0000
 14    0      0    6 6:6:6:0          yes 4350.0000 400.0000 4315.7319
 15    0      0    7 7:7:7:0          yes 4350.0000 400.0000  400.0000

I hope this helps ?

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