[Bug 221744] New: amd_pstate / ACPI: CPU frequency locked at 520MHz when AC disconnected with lid closed during s2idle on HP EliteBook 6 G1ah 14

[Bug 221744] New: amd_pstate / ACPI: CPU frequency locked at 520MHz when AC disconnected with lid closed during s2idle on HP EliteBook 6 G1ah 14

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=221744

            Bug ID: 221744
           Summary: amd_pstate / ACPI: CPU frequency locked at 520MHz when
                    AC disconnected with lid closed during s2idle on HP
                    EliteBook 6 G1ah 14
           Product: Power Management
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: cpufreq
          Assignee: linux-pm@vger.kernel.org
          Reporter: pepegnu@gmail.com
        Regression: No

Here's the affected laptop:
cat /sys/class/dmi/id/product_name /sys/class/dmi/id/product_version
/sys/class/dmi/id/bios_version

HP EliteBook 6 G1ah 14 inch Notebook PC
SBKPFV3
X77 Ver. 01.04.06

After unplugging AC power with lid closed, half of the cores run at 520MHz, the
other half -- on 1.12 GHz. Plug and unplug kicks cores all to 1.12G-2.4GHz.
There's no software way to 'wake' the cores. 

Setting kernel line 'amd_pstate=passive' or 'guided' *has no effect*.

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[Bug 221744] amd_pstate / ACPI: CPU frequency locked at 520MHz when AC disconnected with lid closed during s2idle on HP EliteBook 6 G1ah 14

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=221744

--- Comment #1 from pepegnu@gmail.com ---
Should probably add CPU-info:

lshw -C processor

  *-cpu
       product: AMD Ryzen 5 220 w/ Radeon 740M Graphics
       vendor: Advanced Micro Devices [AMD]
       physical id: 1
       bus info: cpu@0
       version: 25.124.0
       size: 1117MHz
       capacity: 4979MHz
       width: 64 bits
       capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic
sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext
fxsr_opt pdpe1gb rdtscp x86-64 constant_tsc rep_good amd_lbr_v2 nopl xtopology
nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma
cx16 sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand lahf_lm
cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs
skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx
cpuid_fault cpb cat_l3 cdp_l3 hw_pstate ssbd mba perfmon_v2 ibrs ibpb stibp
ibrs_enhanced vmmcall fsgsbase bmi1 avx2 smep bmi2 erms invpcid cqm rdt_a
avx512f avx512dq rdseed adx smap avx512ifma clflushopt clwb avx512cd sha_ni
avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc
cqm_mbm_total cqm_mbm_local user_shstk avx512_bf16 clzero irperf xsaveerptr
rdpru wbnoinvd cppc arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean
flushbyasid decodeassists pausefilter pfthreshold vgif x2avic v_spec_ctrl vnmi
avx512vbmi umip pku ospke avx512_vbmi2 gfni vaes vpclmulqdq avx512_vnni
avx512_bitalg avx512_vpopcntdq rdpid overflow_recov succor smca fsrm flush_l1d
amd_lbr_pmc_freeze cpufreq
       configuration: microcode=175161354

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[Bug 221744] amd_pstate / ACPI: CPU frequency locked at 520MHz when AC disconnected with lid closed during s2idle on HP EliteBook 6 G1ah 14

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=221744

Artem S. Tashkinov (aros@gmx.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mario.limonciello@amd.com

--- Comment #2 from Artem S. Tashkinov (aros@gmx.com) ---
Looks like a dupe of bug 218305.

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[Bug 221744] amd_pstate / ACPI: CPU frequency locked at 520MHz when AC disconnected with lid closed during s2idle on HP EliteBook 6 G1ah 14

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=221744

--- Comment #3 from Artem S. Tashkinov (aros@gmx.com) ---
Does unplugging it and plugging it back in help?

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[Bug 221744] amd_pstate / ACPI: CPU frequency locked at 520MHz when AC disconnected with lid closed during s2idle on HP EliteBook 6 G1ah 14

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=221744

--- Comment #4 from pepegnu@gmail.com ---
Yes, plug and unplug the AC wakes all cpu-cores. (No other software kick
helps) Moreover, once this is done, I can close the lid and re-open it
multiple times, the processor cores stay awaken at 1.12-2.4 GHz just fine.

On Sat, Jul 11, 2026 at 7:33 PM <bugzilla-daemon@kernel.org> wrote:

> https://bugzilla.kernel.org/show_bug.cgi?id=221744
>
> --- Comment #3 from Artem S. Tashkinov (aros@gmx.com) ---
> Does unplugging it and plugging it back in help?
>
> --
> You may reply to this email to add a comment.
>
> You are receiving this mail because:
> You reported the bug.

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[Bug 221744] amd_pstate / ACPI: CPU frequency locked at 520MHz when AC disconnected with lid closed during s2idle on HP EliteBook 6 G1ah 14

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=221744

Artem S. Tashkinov (aros@gmx.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #5 from Artem S. Tashkinov (aros@gmx.com) ---
That's an HP specific EC bug that weirdly affects only Linux.

Anyway, it's a dupe.

*** This bug has been marked as a duplicate of bug 218305 ***

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