wmi_evaluate_method(9)

💅 wmi_evaluate_method — the kernel API manual, but make it make sense

okay so bestie, welcome to the wmi_evaluate_method(9) page 💖 this is a kernel API manual, and yes we're doing this together, you're gonna slay this.

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✨ NAME ✨

wmi_evaluate_method — evaluate a WMI method (and like… it's deprecated, bestie, i'm so serious 😭)

🦋 SYNOPSIS 🦋

acpi_status wmi_evaluate_method (const char *guid_string , u8 instance ,
u32 method_id , const struct acpi_buffer *in , struct acpi_buffer *out
);

🎀 ARGUMENTS 🎀

• guid_string — a 36 character string, and it's giving exactly this form: fa50ff2b-f2e8-45de-83fa-65417f2f49ba. iconic little UUID vibe, no cap 💅
• instance — the instance index, like which one of them you're talking to
• method_id — the method ID you wanna call, yep that one
• in — a mandatory buffer containing the input for the method call, so don't come to the function empty-handed 🙈
• out — an empty buffer that the method results get returned into, it's literally the vessel ✨

💜 DESCRIPTION 💜

So what this does: it calls an ACPI-WMI method. that's it, that's the whole thing 🫶

⚠️ but bestie listen: the caller must free out. you. you free it. nobody's gonna come do it for you, it's your mess now ✨ also, reminder that this whole function is deprecated, so maybe go look at the newer kids in SEE ALSO, iykyk 💀

🌈 RETURN 🌈

Returns an acpi_status signaling success or error — so like, it either ate or it flopped, and you'll know which 💅

🌸 SEE ALSO 🌸

Kernel file ./drivers/platform/wmi/core.c — go read the source, it's lowkey the main character 👑

• wmi_instance_count(9)
• wmidev_instance_count(9)
• wmidev_evaluate_method(9)
• wmidev_invoke_method(9)
• wmidev_invoke_procedure(9)
• wmi_query_block(9)
• wmidev_block_query(9)
• wmidev_query_block(9)
• wmi_set_block(9)
• wmidev_block_set(9)
• wmidev_set_block(9)
• wmi_install_notify_handler(9)
• wmi_remove_notify_handler(9)
• wmi_has_guid(9)
• wmi_get_acpi_device_uid(9)
• wmi_driver_unregister(9)

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and that's the page, bestie, you ate that 🍓 this one came from the ./drivers/platform/wmi source, dated October 2026, and it's filed under wmi_evaluate_method(9) — mwah, go forth and free your buffers 💖✨🎀