wmi_query_block(9)

💅 wmi_query_block — bestie edition

okay so this is from the Kernel API Manual, section 9, and the page is literally called wmi_query_block(9). stay with me, it's a short one but it's important 🫶

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✨ NAME ✨

wmi_query_block — returns the contents of a WMI block. and yeah, she's deprecated 😭 so like… be aware of that going in, no cap.

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🌸 SYNOPSIS 🌸

acpi_status wmi_query_block (const char *guid_string , u8 instance ,
       struct acpi_buffer *out );

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🎀 ARGUMENTS 🎀

• guid_string — a 36 char string, and it has to look exactly like this: fa50ff2b-f2e8-45de-83fa-65417f2f49ba. like, that's the shape of it, the whole GUID vibe 💫
• instance — the instance index, that's a u8 bestie, so keep it smol
• out — an empty buffer that the contents of the data block get returned into. empty is the key word here, don't come in with a pre-filled one 🙈

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🦋 DESCRIPTION 🦋

So what she actually does: you query a single ACPI-WMI block, and then the caller — that's you, girlie — must free out. like, that's on you, not on the function. don't ghost that buffer 💀

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⭐ RETURN ⭐

You get back an ACPI object containing the content of the WMI block. that's the prize 🎁

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🌈 SEE ALSO 🌈

If you wanna go deeper, the kernel file to look at is ./drivers/platform/wmi/core.c (iykyk). and here's the whole little friend group of related calls, all of them, yes all of them:

• wmi_instance_count(9)
• wmidev_instance_count(9)
• wmi_evaluate_method(9)
• wmidev_evaluate_method(9)
• wmidev_invoke_method(9)
• wmidev_invoke_procedure(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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⚠️ real talk: this one is marked deprecated in the NAME section, so maybe don't build your whole main character arc around it? just saying 💅

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that's the whole page, you ate it up honestly 👑 this cutie lives at ./drivers/platform/wmi, dated October 2026, and it's wmi_query_block(9) — mwah, go free that buffer now 🍓💜