[Bug 221403] New: ThinkPad E14 Gen 7 (Hawk Point) CPU throttles to ~544MHz on battery - amd-pmf PMF Smart PC not advertised in BIOS

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221403

            Bug ID: 221403
           Summary: ThinkPad E14 Gen 7 (Hawk Point) CPU throttles to
                    ~544MHz on battery - amd-pmf PMF Smart PC not
                    advertised in BIOS
           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: fuposremoval@proton.me
        Regression: No

Created attachment 309929
  --> https://bugzilla.kernel.org/attachment.cgi?id=309929&action=edit
system-info log and dmesg pmf

Hardware:
  Model:  Lenovo ThinkPad E14 Gen 7 (21T1S29000)
  BIOS:   R2ZET32W 1.21 / EC R2ZHT32W
  CPU:    AMD Ryzen AI 7 250 (family 0x19, model 0x75, stepping 0x2)
  iGPU:   Radeon 780M
  Kernel: 7.0.0-1-cachyos

Symptom:
  CPU frequency drops to ~544MHz on battery and barely bursts
  to 1.1GHz (lowest_nonlinear_freq) under any load. System is
  unusably slow. Plugged in, CPU correctly bursts to 3.2GHz+.

Scaling driver: amd-pstate-epp (active mode)
Scaling max freq: identical plugged and unplugged (5134889)
Boost: enabled (returns 1)
EPP: balance_performance / performance override makes no difference

Tested/confirmed not the cause:
  - amd_pstate=active / guided / passive — all throttle same
  - EPP forced to performance — no effect
  - powerprofilesctl set balanced/performance — no effect  
  - ryzenadj STAPM/PPT override — no effect
  - amd_pmf.disable=1 — no effect
  - dytc_lapmode = 0 (lap mode not triggered)

Key dmesg evidence:
  amd-pmf AMDI0102:00: PMF Smart PC not advertised in BIOS!:-22
  ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored

Suspicion:
  Firmware is applying a hard STAPM/TDP cap on battery that
  cannot be overridden through any Linux power management
  interface. The amd-pmf driver initializes in degraded mode
  due to Smart PC not being advertised, possibly falling back
  to aggressive power limiting behavior.

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