vga_switcher...ister_client(9)

✨ vga_switcheroo_register_client ✨

So bestie, this is a page from the Kernel API Manual — yes, the vga_switcheroo_register_client(9) one 💅 — and it's literally about signing your GPU up to the switcheroo club. Let's get into it 🎀

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🌸 NAME 🌸

vga_switcheroo_register_client — register vga client 🫶

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⭐ SYNOPSIS ⭐

int vga_switcheroo_register_client (struct pci_dev *pdev , const struct
vga_switcheroo_client_ops *ops , bool driver_power_control );

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💖 ARGUMENTS 💖

• pdev — the client's pci device, i.e. the actual GPU you're introducing to the group chat 🖥️
• ops — the client callbacks, your GPU's whole personality fr
• driver_power_control — a bool that says whether the power state is controlled by the driver's runtime pm ⚡ lowkey important, ngl

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🦋 DESCRIPTION 🦋

Okay so here's the vibe: you're registering a vga client (a GPU) 👑 And the way this works — if another GPU and a handler have already registered, then this call enables vga_switcheroo. Iconic.

Heads up though: the power state of the client is assumed to be ON at this point 🔥 Don't come in here half-asleep.

And the prerequisite check? Beforehand, vga_switcheroo_client_probe_defer shall be called to make sure all the prerequisites are met ✅ like, do the reading before the exam bestie, no cap.

Not me reminding you again: call vga_switcheroo_client_probe_defer before this. The manpage literally says "shall". That's a demand, not a suggestion 💀

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🌈 RETURN 🌈

• 0 on success — slay ✨
• -ENOMEM on memory allocation error — the allocation said no ma'am 😭

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💜 SEE ALSO 💜

• Kernel file ./drivers/gpu/vga/vga_switcheroo.c Overview(9)
• struct vga_switcheroo_client(9)
• struct vgasr_priv(9)
• vga_switcheroo_register_handler(9)
• vga_switcheroo_unregister_handler(9)
• vga_switcheroo_handler_flags(9)
• vga_switcheroo_register_audio_client(9)
• vga_switcheroo_client_probe_defer(9)
• vga_switcheroo_get_client_state(9)
• vga_switcheroo_unregister_client(9)
• vga_switcheroo_client_fb_set(9)
• vga_switcheroo_lock_ddc(9)
• vga_switcheroo_unlock_ddc(9)
• Manual switching and manual power control(9)
• vga_switcheroo_process_delayed_switch(9)
• Driver power control(9)
• vga_switcheroo_init_domain_pm_ops(9)

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Okay that's the whole page, you ate that 🍓💅 This little gem lives in ./drivers/gpu/vga, it's dated October 2026, and the header on it says vga_switcher...ister_client(9) — go off, truncated title 😭 mwah, bye bestie 🧚💜