radeon_atpx_switchto(9)

💅 radeon_atpx_switchto(9)

okay so bestie, we're deep in the Kernel API Manual today — this is radeon_atpx_switchto, and honestly? she's a little function with one job and she does it. 🫶

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✨ NAME ✨

radeon_atpx_switchto — switch to the requested GPU

like, the whole personality is right there in the name ngl 💁‍♀️

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🎀 SYNOPSIS 🎀

int radeon_atpx_switchto (enum vga_switcheroo_client_id id );

one function, one arg, returns an int. short and iconic, no notes 💅

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🌸 ARGUMENTS 🌸

• id — the GPU you wanna switch to. that's it, that's the whole parameter. it's an enum vga_switcheroo_client_id, so the vibes are very "pick your fave" 🦋

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💖 DESCRIPTION 💖

okay so what she actually does: radeon_atpx_switchto runs the necessary ATPX functions to switch between the discrete GPU and the integrated GPU, and this applies to all asics — every single one, no exceptions, we love an inclusive queen 👑

returns 0 on success, and an error on failure. that's literally the whole contract. no cap. ⭐

lowkey important: 0 means slay, anything else means something went sideways. check your return values bestie, i'm begging 🙈

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🔥 SEE ALSO 🔥

the kernel file where she lives, plus her entire friend group (they all have their own manpages, go read them, i'm serious):

• Kernel file: ./drivers/gpu/drm/radeon/radeon_atpx_handler.c
• radeon_atpx_call(9)
• radeon_atpx_parse_functions(9)
• radeon_atpx_validate(9)
• radeon_atpx_verify_interface(9)
• radeon_atpx_set_discrete_state(9)
• radeon_atpx_switch_disp_mux(9)
• radeon_atpx_switch_i2c_mux(9)
• radeon_atpx_switch_start(9)
• radeon_atpx_switch_end(9)
• radeon_atpx_power_state(9)
• radeon_atpx_pci_probe_handle(9)
• radeon_atpx_init(9)
• radeon_atpx_get_client_id(9)
• radeon_atpx_detect(9)
• radeon_register_atpx_handler(9)
• radeon_unregister_atpx_handler(9)

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and that's the page!! 🧚 this little beauty comes to you straight out of <cyan>./drivers/gpu/drm/radeon</cyan>, dated October 2026 — go forth and switch those GPUs responsibly, ily, bye bestie 💜🎀