[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@kernel.org]

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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