wmi_brightness_notify(9)

💅 wmi_brightness_notify — a Kernel API Manual moment (section 9, bestie)

okay so real talk, we're in the wmi_brightness_notify(9) page, and it's literally a helper function for calling a WMI-wrapped ACPI method. that's the whole vibe. it's a lil middle-man and it ate. ✨

🌸 SYNOPSIS 🌸

int wmi_brightness_notify (struct wmi_device *w , enum
       wmi_brightness_method id , enum wmi_brightness_mode mode , u32 *val );

like yes, that's the whole signature, copy it exactly bestie, don't be weird about it 🫶

🎀 ARGUMENTS 🎀

• w — pointer to the struct wmi_device that's identified by WMI_BRIGHTNESS_GUID. it's the device, it's the main character, it's who we're talking to 💖
• id — the WMI method ID to call, like for example WMI_BRIGHTNESS_METHOD_LEVEL or WMI_BRIGHTNESS_METHOD_SOURCE. which method are we summoning? that's the tea ☕
• mode — the operation to perform on the method, e.g. WMI_BRIGHTNESS_MODE_SET or WMI_BRIGHTNESS_MODE_GET. are we setting or are we getting? choose wisely 👑
• val — pointer to a value. and here's the important lil twist: it's a value passed in by the caller when mode is WMI_BRIGHTNESS_MODE_SET, or a value passed out to the caller when mode is WMI_BRIGHTNESS_MODE_GET or WMI_BRIGHTNESS_MODE_GET_MAX_LEVEL. so sometimes you're giving, sometimes you're receiving. duality 💫

🔥 DESCRIPTION 🔥

Returns 0 on success, or a negative error number on failure. that's it. that's the whole personality. zero means slay, negative means something went sideways and you should probably go look at it 😭

ngl this function is short but it's doing honest work. respect the helper functions fr fr.

🦋 SEE ALSO 🦋

• Kernel file ./drivers/platform/x86/nvidia-wmi-ec-backlight.c — go read the source bestie, iykyk 📖

and that's the page!! kernel API manual energy, from ./drivers/platform/x86, dated October 2026, living under the name wmi_brightness_notify(9). mwah, go forth and notify ur brightness 🌈💜