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Adding acpi_osi=! acpi_osi="Windows 2022" to the kernel > cmdline restores 31-33 W - verified across multiple charge cycles on > kernels 7.1.6 and 6.18.42-LTS. > > I checked with HP first: they declined in writing (warranty case > #5163282638, supervisor email 2026-08-10), saying the firmware is > "specifically manufactured and optimized for the Windows operating system" > and not supported for other OSes. A kernel-side quirk is therefore the > only fix path. > > The patch claims _OSI("Windows 2022") via acpi_osi_setup() with a DMI > match scoped to board 8DA8 (same mechanism as dmi_enable_osi_linux), so > no other platform is affected. Full evidence - DSDT/SSDT strings, EC RAM > dumps, measurement logs - is on the bugzilla report below; happy to add > sibling boards as owners confirm. > > Thanks for looking, > David > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=221866 bugzilla.kernel.org/show_bug.cgi?id=221866> Are you sure about your proposed root cause? It has been enabled a very long time. https://git.kernel.org/torvalds/c/dd067afe3f8cb