New: Rmmod'ing amd-pstate doesn't restore acpi-cpufreq
https://bugzilla.kernel.org/show_bug.cgi?id=215801
Bug ID: 215801
Summary: Rmmod'ing amd-pstate doesn't restore acpi-cpufreq
Product: Power Management
Version: 2.5
Kernel Version: 5.17.1
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: cpufreq
Assignee: [email protected]
Reporter: [email protected]
Regression: NoIt's nice that you can now replace acpi-cpufreq with amd-pstate using replace=1 but what about the opposite?
Can it be done without rebooting if acpi-cpufreq is built-in?
Would be really nice to have.
Meanwhile some sort of power managerment still works after rmmod amd-pstate because I see that reported frequencies in /proc/cpuinfo change: one or two random cores are oscillating between 1700 and 2000MHz, all the others are stuck at 3800MHz.
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[Bug 215801] Rmmod'ing amd-pstate doesn't restore acpi-cpufreq
https://bugzilla.kernel.org/show_bug.cgi?id=215801
--- Comment #1 from Artem S. Tashkinov ([email protected]) --- Huang Rui,
Is this doable or I'm asking too much?
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[Bug 215801] Rmmod'ing amd-pstate doesn't restore acpi-cpufreq
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=215801
--- Comment #2 from Artem S. Tashkinov ([email protected]) --- This is still relevant as of Linux 6.6.
Would be great if removing amd-pstate enabled acpi-cpufreq.
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[Bug 215801] Rmmod'ing amd-pstate doesn't restore acpi-cpufreq
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=215801
--- Comment #4 from Artem S. Tashkinov ([email protected]) --- (In reply to Perry Yuan(AMD) from comment #3)
Quoted 5 lines
(In reply to Artem S. Tashkinov from comment #2)
Quoted 3 lines
This is still relevant as of Linux 6.6.
Would be great if removing amd-pstate enabled acpi-cpufreq.
Quoted 7 lines
Normally the system hardware needs to reinitialize CPPC and low-level power management firmware when CPPC driver loading, so it better to change grub parameters and reboot again.
dynamically removing amd-pstate and loadacpi_cpufreqprobably cause some potential issues.Perry.
Could you add this as a note to the amd pstate driver documentation?
Documentation/admin-guide/pm/amd-pstate.rst
Thank you!
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[Bug 215801] Rmmod'ing amd-pstate doesn't restore acpi-cpufreq
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=215801
Perry Yuan(AMD) ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]
--- Comment #3 from Perry Yuan(AMD) ([email protected]) --- (In reply to Artem S. Tashkinov from comment #2)
Quoted 3 lines
This is still relevant as of Linux 6.6.
Would be great if removing amd-pstate enabled acpi-cpufreq.
Normally the system hardware needs to reinitialize CPPC and low-level power management firmware when CPPC driver loading, so it better to change grub parameters and reboot again.
dynamically removing amd-pstate and load acpi_cpufreq probably cause some potential issues.
Perry.
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[Bug 215801] Rmmod'ing amd-pstate doesn't restore acpi-cpufreq
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=215801
Artem S. Tashkinov ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |WILL_NOT_FIXSignature · 4 lines
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[Bug 215801] Rmmod'ing amd-pstate doesn't restore acpi-cpufreq
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=215801
--- Comment #5 from Perry Yuan(AMD) ([email protected]) --- (In reply to Artem S. Tashkinov from comment #4)
Quoted 12 lines
(In reply to Perry Yuan(AMD) from comment #3)
Quoted 11 lines
(In reply to Artem S. Tashkinov from comment #2)
Quoted 3 lines
This is still relevant as of Linux 6.6.
Would be great if removing amd-pstate enabled acpi-cpufreq.
Normally the system hardware needs to reinitialize CPPC and low-level power management firmware when CPPC driver loading, so it better to change grub parameters and reboot again.
dynamically removing amd-pstate and loadacpi_cpufreqprobably cause some potential issues.
Quoted 7 lines
Quoted 1 line
Perry.
Could you add this as a note to the amd pstate driver documentation?
Documentation/admin-guide/pm/amd-pstate.rstThank you!
Sure, we can add this to amd-pstate.rst with a new update.
Perry.
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