drm_dp_dual_mode_detect(9)

💅 drm_dp_dual_mode_detect 💅

okay so this is a page from the Kernel API Manual, bestie — we're deep in kernel-land, and this little function is here to help you figure out what kind of DP dual mode adaptor you're actually holding. Slay. Let's get into it 🫶

---

✨ NAME ✨

drm_dp_dual_mode_detect — literally just: identify the DP dual mode adaptor 🔍

---

🌸 SYNOPSIS 🌸

enum drm_dp_dual_mode_type drm_dp_dual_mode_detect (const struct
drm_device *dev , struct i2c_adapter *adapter );

---

🎀 ARGUMENTS 🎀

• dev — the drm_device to use. that's your main character right there 👑
• adapter — the I2C adapter for the DDC bus. yes, the DDC bus, no cap 🦋

---

🦋 DESCRIPTION 🦋

So what does it do? It attempts to identify the type of the DP dual mode adaptor used. That's the whole vibe check 💅

⚠️ but bestie, listen — when the answer comes back as DRM_DP_DUAL_MODE_UNKNOWN, it's not certain whether we're dealing with a native HDMI port or a type 1 DVI dual mode adaptor. like, genuinely unclear 😭 the driver is gonna have to use some other hardware/driver specific mechanism to make that distinction. not me having to figure it out myself 💀

---

⭐ RETURN ⭐

It returns the type of the DP dual mode adaptor used ✨ that's it, that's the tea 🍓

---

🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/display/drm_dp_dual_mode_helper.c — the dp dual mode helpers(9), iconic behaviour honestly
• drm_dp_dual_mode_read(9)
• drm_dp_dual_mode_write(9)
• drm_dp_dual_mode_max_tmds_clock(9)
• drm_dp_dual_mode_get_tmds_output(9)
• drm_dp_dual_mode_set_tmds_output(9)
• drm_dp_get_dual_mode_type_name(9)
• drm_lspcon_get_mode(9)
• drm_lspcon_set_mode(9)

---

and that's a wrap, bestie 🧚💜 this one came straight out of ./drivers/gpu/drm/display, dated October 2026 — go forth and identify those adaptors, periodt 💅✨