Re: [REGRESSION] CPU running at fixed frequency (~1.7 GHz) with kernel 7.1-rc1

[Mario Limonciello <mario.limonciello@amd.com>]

On 5/8/26 15:32, Viktor Jägersküpper wrote:
> Am 08.05.26 um 22:05 schrieb Viktor Jägersküpper:
>> Am 08.05.26 um 21:56 schrieb Mario Limonciello:
>>> On 5/8/26 14:53, Viktor Jägersküpper wrote:
>>>> Am 08.05.26 um 21:01 schrieb Mario Limonciello:
>>>>> On 5/8/26 13:56, Viktor Jägersküpper wrote:
>>>>>> Am 08.05.26 um 14:57 schrieb Mario Limonciello:
>>>>>>> On 5/8/26 04:31, Thorsten Leemhuis wrote:
>>>>>>>> * there is a whole patch series with fixes for the culprit:
>>>>>>>> https://lore.kernel.org/all/20260508051748.10484-1-kprateek.nayak@amd.com/
>>>>>>>>
>>>>>>>
>>>>>>> I don't think any of these will help; but that would a fine surprise if so.
>>>>>>>
>>>>>>
>>>>>> This patch series fixes the bug when I boot with "amd_dynamic_epp=disable" (I built
>>>>>> the kernel with CONFIG_X86_AMD_PSTATE_DYNAMIC_EPP=y). I didn't bisect to find out
>>>>>> which patch contains the partial fix, but I can do this if it helps.
>>>>>>
>>>>>> If you need further information (acpidump and/or output from amd-pstate tool), just
>>>>>> tell me.
>>>>>
>>>>> When you have dynamic EPP enabled it sets up platform profile.  With that series in place does changing platform profile help?
>>>>
>>>> Strangely *changing* the power profile (to any value) seems to enable the expected
>>>> boosting behaviour, but since I can only do that when the PC has finished booting,
>>>> the cores still seem to be stuck at ~1.7 GHz until then. Unless I am doing something
>>>> stupid, that's not how it's supposed to work, I guess?
> 
> Correction: Only changing the profile to "power-saver" leads to the expected behaviour,
> switching between "balanced" and "performance" even several times in a row doesn't
> help.

Can you clarify what you mean specifically by expected behavior and 
incorrect behavior with this patch series?
> 
>>>
>>> Can you confirm your tree when you found this?
>>> 7.1-rc2 + Prateek's series?
>>
>> Yes, exactly this.
>>
>>>
>>> I would say that is not expected behavior; but it does hint further at the second bug.  Hopefully I can repro it.
>>>
>>>>
>>>>>> Last week I got this output after applying a debugging patch from you:
>>>>>>>> On 4/29/26 20:34, Viktor Jägersküpper wrote:
>>>>>>>>> Am 29.04.26 um 19:14 schrieb Mario Limonciello:
>>>>>>>>>>
>>>>>>>>>> OK thanks.  Here is a debugging patch that should show what's happening in the new paths from e30ca6dd5345c5b8ba05f346a8e81105352fe571 so we can confirm root cause on your system.
>>>>>>>>>
>>>>>>>>> These are the dmesg lines concerning amd-pstate:
>>>>>>>>> [    0.845044] amd_pstate: amd_pstate: CPU 0: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.845047] amd_pstate: amd_pstate: CPU 0: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.845059] amd_pstate: amd_pstate: CPU 0: platform_profile_register succeeded
>>>>>>>>> [    0.845060] amd_pstate: amd_pstate: CPU 0: registering power supply notifier
>>>>>>>>> [    0.849046] amd_pstate: amd_pstate: CPU 1: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.849047] amd_pstate: amd_pstate: CPU 1: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.849058] amd_pstate: amd_pstate: CPU 1: platform_profile_register succeeded
>>>>>>>>> [    0.849059] amd_pstate: amd_pstate: CPU 1: registering power supply notifier
>>>>>>>>> [    0.853043] amd_pstate: amd_pstate: CPU 2: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.853044] amd_pstate: amd_pstate: CPU 2: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.853054] amd_pstate: amd_pstate: CPU 2: platform_profile_register succeeded
>>>>>>>>> [    0.853054] amd_pstate: amd_pstate: CPU 2: registering power supply notifier
>>>>>>>>> [    0.857043] amd_pstate: amd_pstate: CPU 3: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.857044] amd_pstate: amd_pstate: CPU 3: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.857054] amd_pstate: amd_pstate: CPU 3: platform_profile_register succeeded
>>>>>>>>> [    0.857054] amd_pstate: amd_pstate: CPU 3: registering power supply notifier
>>>>>>>>> [    0.861045] amd_pstate: amd_pstate: CPU 4: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.861046] amd_pstate: amd_pstate: CPU 4: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.861056] amd_pstate: amd_pstate: CPU 4: platform_profile_register succeeded
>>>>>>>>> [    0.861057] amd_pstate: amd_pstate: CPU 4: registering power supply notifier
>>>>>>>>> [    0.865044] amd_pstate: amd_pstate: CPU 5: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.865046] amd_pstate: amd_pstate: CPU 5: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.865057] amd_pstate: amd_pstate: CPU 5: platform_profile_register succeeded
>>>>>>>>> [    0.865058] amd_pstate: amd_pstate: CPU 5: registering power supply notifier
>>>>>>>>> [    0.870044] amd_pstate: amd_pstate: CPU 6: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.870046] amd_pstate: amd_pstate: CPU 6: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.870058] amd_pstate: amd_pstate: CPU 6: platform_profile_register succeeded
>>>>>>>>> [    0.870058] amd_pstate: amd_pstate: CPU 6: registering power supply notifier
>>>>>>>>> [    0.874044] amd_pstate: amd_pstate: CPU 7: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.874045] amd_pstate: amd_pstate: CPU 7: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.874056] amd_pstate: amd_pstate: CPU 7: platform_profile_register succeeded
>>>>>>>>> [    0.874057] amd_pstate: amd_pstate: CPU 7: registering power supply notifier
>>>>>>>>> [    0.878045] amd_pstate: amd_pstate: CPU 8: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.878046] amd_pstate: amd_pstate: CPU 8: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.878055] amd_pstate: amd_pstate: CPU 8: platform_profile_register succeeded
>>>>>>>>> [    0.878056] amd_pstate: amd_pstate: CPU 8: registering power supply notifier
>>>>>>>>> [    0.882045] amd_pstate: amd_pstate: CPU 9: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.882046] amd_pstate: amd_pstate: CPU 9: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.882055] amd_pstate: amd_pstate: CPU 9: platform_profile_register succeeded
>>>>>>>>> [    0.882056] amd_pstate: amd_pstate: CPU 9: registering power supply notifier
>>>>>>>>> [    0.886045] amd_pstate: amd_pstate: CPU 10: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.886046] amd_pstate: amd_pstate: CPU 10: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.886055] amd_pstate: amd_pstate: CPU 10: platform_profile_register succeeded
>>>>>>>>> [    0.886056] amd_pstate: amd_pstate: CPU 10: registering power supply notifier
>>>>>>>>> [    0.890045] amd_pstate: amd_pstate: CPU 11: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.890046] amd_pstate: amd_pstate: CPU 11: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.890056] amd_pstate: amd_pstate: CPU 11: platform_profile_register succeeded
>>>>>>>>> [    0.890056] amd_pstate: amd_pstate: CPU 11: registering power supply notifier
>>>>>>>>> [    0.894046] amd_pstate: amd_pstate: CPU 12: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.894047] amd_pstate: amd_pstate: CPU 12: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.894056] amd_pstate: amd_pstate: CPU 12: platform_profile_register succeeded
>>>>>>>>> [    0.894057] amd_pstate: amd_pstate: CPU 12: registering power supply notifier
>>>>>>>>> [    0.898046] amd_pstate: amd_pstate: CPU 13: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.898047] amd_pstate: amd_pstate: CPU 13: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.898055] amd_pstate: amd_pstate: CPU 13: platform_profile_register succeeded
>>>>>>>>> [    0.898056] amd_pstate: amd_pstate: CPU 13: registering power supply notifier
>>>>>>>>> [    0.902046] amd_pstate: amd_pstate: CPU 14: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.902048] amd_pstate: amd_pstate: CPU 14: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.902059] amd_pstate: amd_pstate: CPU 14: platform_profile_register succeeded
>>>>>>>>> [    0.902059] amd_pstate: amd_pstate: CPU 14: registering power supply notifier
>>>>>>>>> [    0.906046] amd_pstate: amd_pstate: CPU 15: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.906048] amd_pstate: amd_pstate: CPU 15: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.906060] amd_pstate: amd_pstate: CPU 15: platform_profile_register succeeded
>>>>>>>>> [    0.906060] amd_pstate: amd_pstate: CPU 15: registering power supply notifier
>>>>>>>>> [    0.910046] amd_pstate: amd_pstate: CPU 16: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.910048] amd_pstate: amd_pstate: CPU 16: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.910058] amd_pstate: amd_pstate: CPU 16: platform_profile_register succeeded
>>>>>>>>> [    0.910059] amd_pstate: amd_pstate: CPU 16: registering power supply notifier
>>>>>>>>> [    0.914047] amd_pstate: amd_pstate: CPU 17: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.914048] amd_pstate: amd_pstate: CPU 17: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.914059] amd_pstate: amd_pstate: CPU 17: platform_profile_register succeeded
>>>>>>>>> [    0.914060] amd_pstate: amd_pstate: CPU 17: registering power supply notifier
>>>>>>>>> [    0.918049] amd_pstate: amd_pstate: CPU 18: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.918051] amd_pstate: amd_pstate: CPU 18: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.918081] amd_pstate: amd_pstate: CPU 18: platform_profile_register succeeded
>>>>>>>>> [    0.918082] amd_pstate: amd_pstate: CPU 18: registering power supply notifier
>>>>>>>>> [    0.922049] amd_pstate: amd_pstate: CPU 19: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.922051] amd_pstate: amd_pstate: CPU 19: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.922070] amd_pstate: amd_pstate: CPU 19: platform_profile_register succeeded
>>>>>>>>> [    0.922071] amd_pstate: amd_pstate: CPU 19: registering power supply notifier
>>>>>>>>> [    0.926049] amd_pstate: amd_pstate: CPU 20: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.926052] amd_pstate: amd_pstate: CPU 20: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.926073] amd_pstate: amd_pstate: CPU 20: platform_profile_register succeeded
>>>>>>>>> [    0.926074] amd_pstate: amd_pstate: CPU 20: registering power supply notifier
>>>>>>>>> [    0.930049] amd_pstate: amd_pstate: CPU 21: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.930052] amd_pstate: amd_pstate: CPU 21: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.930071] amd_pstate: amd_pstate: CPU 21: platform_profile_register succeeded
>>>>>>>>> [    0.930072] amd_pstate: amd_pstate: CPU 21: registering power supply notifier
>>>>>>>>> [    0.934050] amd_pstate: amd_pstate: CPU 22: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.934052] amd_pstate: amd_pstate: CPU 22: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.934072] amd_pstate: amd_pstate: CPU 22: platform_profile_register succeeded
>>>>>>>>> [    0.934073] amd_pstate: amd_pstate: CPU 22: registering power supply notifier
>>>>>>>>> [    0.938050] amd_pstate: amd_pstate: CPU 23: calling amd_pstate_set_dynamic_epp (current_profile=3)
>>>>>>>>> [    0.938052] amd_pstate: amd_pstate: CPU 23: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80)
>>>>>>>>> [    0.938073] amd_pstate: amd_pstate: CPU 23: platform_profile_register succeeded
>>>>>>>>> [    0.938074] amd_pstate: amd_pstate: CPU 23: registering power supply notifier
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>