hdmi_cec_state_write(9)

💅 hdmi_cec_state_write — bestie's guide to flipping the HDMI-CEC switch 💅

okay so this one lives in the Kernel API Manual, section 9, and it's literally the driver-side remote control for your HDMI-CEC feature. hdmi_cec_state_write — Enable/Disable HDMI-CEC feature from driver side. That's the whole vibe. No cap. 🎀

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✨ SYNOPSIS ✨

ssize_t hdmi_cec_state_write (struct file *f , const char __user *buf ,
size_t size , loff_t *pos );

yeah it's a chunky signature, but she's iconic and you're gonna slay it 🫶

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🌸 ARGUMENTS 🌸

• f — the file structure. just... the file structure. she's there. 💁‍♀️
• buf — the userspace buffer, and this is the whole main character of the story: set it to '1' to enable the cec feature, or '0' to disable it. that's it, that's the toggle ✨
• size — how big the buffer is, coming at us from userspace 📏
• pos — unused. she's just chilling. not invited to the party but she showed up anyway 💀

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🔥 DESCRIPTION 🔥

so what actually happens? return size on success, and an error code on failure. that's the deal, fr fr — success means you get the size back, failure means a sad little error code. know the difference, bestie 💅

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🦋 SEE ALSO 🦋

• the kernel file ./drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c — go read her, she's got lore 👑
• hdmi_cec_state_show(9) — the other half of this duo, the read to your write 🌈
• hdmi_automation_enable(9) — more automation content, obsessed ⭐

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lowkey reminder: it's '1' for enable, '0' for disable. do NOT mix them up or the cec feature will be doing the exact opposite of what you meant 🙈

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and that's the page!! this cutie is hdmi_cec_state_write(9) from ./drivers/gpu/drm/amd/display/..., dated October 2026 — go forth and toggle responsibly, ily, mwah 💖🧚‍♀️