STRUCT VBT_HEADER(9)

💖 struct vbt_header(9) 💖

okay so bestie, welcome to the Kernel API Manual ✨ — today we're doing a deep dive on struct vbt_header, aka the VBT Header structure, and honestly? it's giving "front cover of the whole VBT situation" 👑

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🌸 NAME 🌸

struct vbt_header — the VBT Header structure. she's the header, she's the vibe check for everything that comes after her 💅

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🦋 SYNOPSIS 🦋

struct vbt_header {
    u8 signature[20];
    u16 version;
    u16 header_size;
    u16 vbt_size;
    u8 vbt_checksum;
    u8 reserved0;
    u32 bdb_offset;
    u32 aim_offset[4];
 };

look at her. flawless. no notes 💖

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✨ Members ✨

so here's the cast of characters, one by one, no skips, no cap:

• signature — the VBT signature, and it always starts with "$VBT" — literally always, that's her whole thing 🎀
• version — the version of this structure
• header_size — the size of this structure
• vbt_size — the size of the VBT, which means the VBT Header, the BDB Header and the data blocks all together 🫶
• vbt_checksum — the checksum, keeping everyone honest 🔥
• reserved0 — reserved. she's just sitting there. main character energy of doing absolutely nothing 💀
• bdb_offset — the offset of struct bdb_header from the beginning of the VBT
• aim_offset — the offsets of the add-in data blocks from the beginning of the VBT

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/i915/display/intel_vbt_defs.h
• struct bdb_header(9) — the next chapter, go read her too 🦋

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ngl bestie, if you're poking at VBT internals you're already kind of iconic. go off 👑

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mwah 💋 this came to you from ./drivers/gpu/drm/i915/display, dated October 2026 — struct vbt_header(9), out 🎀✨