New: amd_pstate / ACPI: CPU frequency locked at 520MHz when AC disconnected with lid closed during s2idle on HP EliteBook 6 G1ah 14
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: [email protected]
Reporter: [email protected]
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*.
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 221744] amd_pstate / ACPI: CPU frequency locked at 520MHz when AC disconnected with lid closed during s2idle on HP EliteBook 6 G1ah 14
https://bugzilla.kernel.org/show_bug.cgi?id=221744
--- Comment #1 from [email protected] ---
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
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 221744] amd_pstate / ACPI: CPU frequency locked at 520MHz when AC disconnected with lid closed during s2idle on HP EliteBook 6 G1ah 14
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=221744
Artem S. Tashkinov ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]
--- Comment #2 from Artem S. Tashkinov ([email protected]) --- Looks like a dupe of bug 218305.
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 221744] amd_pstate / ACPI: CPU frequency locked at 520MHz when AC disconnected with lid closed during s2idle on HP EliteBook 6 G1ah 14
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=221744
--- Comment #3 from Artem S. Tashkinov ([email protected]) --- Does unplugging it and plugging it back in help?
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 221744] amd_pstate / ACPI: CPU frequency locked at 520MHz when AC disconnected with lid closed during s2idle on HP EliteBook 6 G1ah 14
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=221744
--- Comment #4 from [email protected] ---
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.
Quoted 10 lines · On Sat, Jul 11, 2026 at 7:33 PM <[email protected]> wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=221744
--- Comment #3 from Artem S. Tashkinov ([email protected]) --- 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.
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 221744] amd_pstate / ACPI: CPU frequency locked at 520MHz when AC disconnected with lid closed during s2idle on HP EliteBook 6 G1ah 14
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=221744
Artem S. Tashkinov ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE--- Comment #5 from Artem S. Tashkinov ([email protected]) --- 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 ***
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.