[Bug 218305] Ryzen 7 7840HS gets stuck at 544MHz frequency after resuming after unplugging the power cord during sleep

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218305

--- Comment #157 from pepegnu@gmail.com ---
Frequency stuck at ~500 MHz after suspend->charge->unplug AC->resume on:

* HP EliteBook 6 G1ah 14 inch Notebook PC
* AMD Ryzen 5 220 w/ Radeon 740M Graphics
* Platform Firmware Information
        Vendor: HP
        Version: X77 Ver. 01.04.06
        Release Date: 05/12/2026
* uname -a
Linux xe 7.1.3-arch1-2 #1 SMP PREEMPT_DYNAMIC Thu, 09 Jul 2026 x86_64 GNU/Linux

How to reproduce:

1) Start charging the laptop with lid closed
2) Detach laptop with lid *closed* from AC power
3) Open the lid. Then frequenccies on most cores remain stuck *low*:

# >> Cat files in /sys/devices/system/cpu/cpu*/cpufreq | sort-ed | uniq-ued:

  /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver: amd-pstate-epp
  /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor: powersave
  /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference:
balance_power

# grep cpu.MHz /proc/cpuinfo | cut -d: -f2| nl -v 0
     0   544.363
     1   544.358
     2   520.431
     3   519.626
     4   520.400
     5   1117.810
     6   520.059
     7   520.041
     8   544.355
     9   1117.810
    10   520.488
    11   1117.810

4) Attach AC-power for 5 sec when the lid is *open*
5) Detach AC-power leaving the *lid open*. The cpu-frequencies 'wake up':
# >> Cat files in /sys/devices/system/cpu/cpu*/cpufreq | sort-ed | uniq-ued:

  /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver: amd-pstate-epp
  /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor: powersave
  /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference:
balance_power

# grep cpu.MHz /proc/cpuinfo | cut -d: -f2| nl -v 0
     0   1365.791
     1   1367.646
     2   2278.527
     3   1117.810
     4   2278.704
     5   1117.810
     6   1364.481
     7   1366.707
     8   2152.118
     9   1437.688
    10   2275.372
    11   2277.464

6) Further repeated flipping the lid and re-opening when run on BAT0 retain the
normal frequencies.

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