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 04:31, Thorsten Leemhuis wrote:
> Lo! Mario, what happened to this? This lookes stalled.

I got caught up with other things and forgot about it.

> 
> Side notes:
> 
> * another report about an issue like this was filed here and contains a
> patch from Mario for testing:
> https://bugzilla.kernel.org/show_bug.cgi?id=221473

Yes please see if that helps.

> 
> * 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.

> Ciao, Thorsten
> 
> On 4/29/26 20:34, Viktor Jägersküpper wrote:
>> Am 29.04.26 um 19:14 schrieb Mario Limonciello:
>>>
>>>
>>> On 4/29/26 11:20, Viktor Jägersküpper wrote:
>>>> Am 29.04.26 um 17:54 schrieb Mario Limonciello:
>>>>>
>>>>>
>>>>> On 4/29/26 10:38, Viktor Jägersküpper wrote:
>>>>>> Am 29.04.26 um 16:25 schrieb Mario Limonciello:
>>>>>>>
>>>>>>>
>>>>>>> On 4/29/26 08:54, Viktor Jägersküpper wrote:
>>>>>>>> [You don't often get email from viktor_jaegerskuepper@freenet.de. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
>>>>>>>>
>>>>>>>> Am 29.04.26 um 15:04 schrieb Mario Limonciello:
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On 4/29/26 07:34, Viktor Jägersküpper wrote:
>>>>>>>>>> [You don't often get email from viktor_jaegerskuepper@freenet.de. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
>>>>>>>>>>
>>>>>>>>>> Hi,
>>>>>>>>>>
>>>>>>>>>> when I boot my desktop system running with an AMD Ryzen 9 5900X using
>>>>>>>>>> the kernel 7.1-rc1, all CPU cores seem to run at ~1.7 GHz constantly,
>>>>>>>>>> i.e. I don't observe any core frequency boosting under load. This never
>>>>>>>>>> happened with older kernel releases, e.g. with 7.0-rc7. I ran
>>>>>>>>>> 'git bisect' and found this first bad commit:
>>>>>>>>>>
>>>>>>>>>> e30ca6dd5345c5b8ba05f346a8e81105352fe571 cpufreq/amd-pstate: Add dynamic energy performance preference
>>>>>>>>>
>>>>>>>>> If you compile with CONFIG_X86_AMD_PSTATE_DYNAMIC_EPP=n (instead of using kernel command line to turn it off) does the issue go away?
>>>>>>>>>
>>>>>>>>
>>>>>>>> No, and still nothing about amd-pstate in dmesg.
>>>>>>>
>>>>>>> Can you turn on dynamic debugging for amd-pstate.c?  Something like this:
>>>>>>>
>>>>>>> dyndbg='file drivers/cpufreq/amd-pstate.c +p'
>>>>>>>
>>>>>>
>>>>>> Both kernel builds (with CONFIG_X86_AMD_PSTATE_DYNAMIC_EPP=y/n) have the following config:
>>>>>> CONFIG_DYNAMIC_DEBUG=y
>>>>>> CONFIG_DYNAMIC_DEBUG_CORE=y
>>>>>>
>>>>>> Booting with the above dyndbg parameter gives me only this line about amd-pstate in dmesg:
>>>>>> [    0.844066] amd_pstate: AMD CPPC shared memory based functionality is supported
>>>>>>
>>>>>> Do I have to do anything else besides booting with the dyndbg parameter? I have tried
>>>>>> both builds.
>>>>>
>>>>> You shouldn't have to.  I think there might be something silently failing in the init path now.  Maybe platform profile registration is failing for your system?  I haven't reproduced this on my side on any of my systems unfortunately.
>>>>>
>>>>> Do you think you can sprinkle printk()'s around the init to figure it out?  If you need me to write a patch that does this I can try to whip one up.
>>>>>
>>>>
>>>> Please write a patch, I am just a user trying to help.
>>>
>>> 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
>>
>>
>