New: amd-pstate dynamic EPP regression on Ryzen 5 3600

Bug 221473 [email protected] 1 participant 3 messages May 6 – May 7

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author

2026-05-06 18:10 UTC #0 lore raw

https://bugzilla.kernel.org/show_bug.cgi?id=221473

            Bug ID: 221473
           Summary: amd-pstate dynamic EPP regression on Ryzen 5 3600
           Product: Power Management
           Version: 2.5
    Kernel Version: 7.1.0-rc2
          Hardware: AMD
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: cpufreq
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
        Regression: Yes
           Bisected e30ca6dd5345c5b8ba05f346a8e81105352fe571
         commit-id:

Created attachment 310042
--> https://bugzilla.kernel.org/attachment.cgi?id=310042&action=edit
dmesg and config

amd-pstate dynamic EPP regression on Ryzen 5 3600

My CPU which normally boosts to 4.0GHz (PBO enabled) was stuck at 1.7GHz under full load. Same result with CONFIG_X86_AMD_PSTATE_DYNAMIC_EPP set to either 'y' or 'n'. I bisected to this commit:

commit e30ca6dd5345c5b8ba05f346a8e81105352fe571
Author: Mario Limonciello (AMD) <[email protected]>

cpufreq/amd-pstate: Add dynamic energy performance preference

Arch Linux
Linux version 7.1.0-rc2-00099-gadc1e5c6203c (stuart@romano) (gcc (GCC) 16.1.1 20260430, GNU ld (GNU Binutils) 2.46.0) #1 SMP PREEMPT_DYNAMIC Wed May 6 15:30:26 UTC 2026
Gigabyte Technology Co., Ltd. B450M DS3H/B450M DS3H-CF, BIOS F67 10/28/2025 Advanced Micro Devices, Inc. [AMD/ATI] Navi 44 [Radeon RX 9060 XT] (rev c0) AMD Ryzen 5 3600 6-Core Processor
32GB DDR4 DRAM F4-3000C16-8GVRB

CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL=y
CONFIG_CPU_FREQ_GOV_SCHEDUTIL=y
CONFIG_X86_AMD_PSTATE=y
CONFIG_X86_AMD_PSTATE_DEFAULT_MODE=3
CONFIG_X86_AMD_PSTATE_DYNAMIC_EPP=y
CONFIG_X86_AMD_PSTATE_UT=m

==> /sys/devices/system/cpu/cpu0/cpufreq/affected_cpus <==
0
==> /sys/devices/system/cpu/cpu0/cpufreq/amd_pstate_highest_perf <== 166
==> /sys/devices/system/cpu/cpu0/cpufreq/amd_pstate_hw_prefcore <== enabled
==> /sys/devices/system/cpu/cpu0/cpufreq/amd_pstate_lowest_nonlinear_freq <== 1723944
==> /sys/devices/system/cpu/cpu0/cpufreq/amd_pstate_max_freq <== 4208451
==> /sys/devices/system/cpu/cpu0/cpufreq/amd_pstate_prefcore_ranking <== 171
==> /sys/devices/system/cpu/cpu0/cpufreq/boost <==
1
==> /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_avg_freq <== 1723944
==> /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq <== 4208451
==> /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq <== 557747
==> /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_transition_latency <== 0
==> /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_available_preferences <==
default performance balance_performance balance_power power custom ==> /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference <== performance
==> /sys/devices/system/cpu/cpu0/cpufreq/related_cpus <==
0
==> /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors <== performance powersave
==> /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq <== 1736801
==> /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/scaling_max_freq <== 4208451
==> /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq <== 1723944
==> /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed <== <unsupported>

For comparison, here are the same settings on kernel 7.0.3-arch1-2:

==> /sys/devices/system/cpu/cpu0/cpufreq/affected_cpus <==
0
==> /sys/devices/system/cpu/cpu0/cpufreq/amd_pstate_highest_perf <== 166
==> /sys/devices/system/cpu/cpu0/cpufreq/amd_pstate_hw_prefcore <== enabled
==> /sys/devices/system/cpu/cpu0/cpufreq/amd_pstate_lowest_nonlinear_freq <== 1723944
==> /sys/devices/system/cpu/cpu0/cpufreq/amd_pstate_max_freq <== 4208451
==> /sys/devices/system/cpu/cpu0/cpufreq/amd_pstate_prefcore_ranking <== 171
==> /sys/devices/system/cpu/cpu0/cpufreq/boost <==
1
==> /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_avg_freq <== 3656148
==> /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq <== 4208451
==> /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq <== 557747
==> /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_transition_latency <== 0
==> /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_available_preferences <==
default performance balance_performance balance_power power
==> /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference <== balance_performance
==> /sys/devices/system/cpu/cpu0/cpufreq/related_cpus <==
0
==> /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors <== performance powersave
==> /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq <== 3693566
==> /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/scaling_max_freq <== 4208451
==> /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq <== 1723944
==> /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed <== <unsupported>

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author

2026-05-07 20:36 UTC #1 lore raw

[Bug 221473] amd-pstate dynamic EPP regression on Ryzen 5 3600

https://bugzilla.kernel.org/show_bug.cgi?id=221473

--- Comment #1 from Mario Limonciello (AMD) ([email protected]) --- Can you please share an acpidump as well as the output from the amd-pstate tool at https://git.kernel.org/pub/scm/linux/kernel/git/superm1/amd-debug-tools.git/

Thanks!

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author

2026-05-07 20:53 UTC #2 lore raw

[Bug 221473] amd-pstate dynamic EPP regression on Ryzen 5 3600

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=221473

Mario Limonciello (AMD) ([email protected]) changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|NEW                         |ASSIGNED
           Assignee|[email protected]    |[email protected]

--- Comment #2 from Mario Limonciello (AMD) ([email protected]) --- Created attachment 310056
--> https://bugzilla.kernel.org/attachment.cgi?id=310056&action=edit
possible patch

Can you see if this patch helps - specifically in dynamic EPP turned off.

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