Odyssey G95NC - DDC/UTIL Feature Request

[sam_hain_thorn]

Is there a way that Samsung developers can expose the DDC/CI feature channel for changing the input source.  I currently have two video inputs through PIP with my keyboard and mouse connected.  Whenever I want to use my keyboard and mouse on a different input I have to physically select the button on the monitor to change the input source for the keyboard/mouse.  I would like to see if its possible to expose the DDC Feature for USB/KVM switching.   Other monitor manufacturers expose this via 0xE3 or another channel.  For the amount of money that is spent on this I would hope its a quick implementation by Samsung developers to give users a better experience.  If you look below I can change the input video for the screen, but not the input source for the keyboard/mouse.  Feature 60 is for the video, but the feature is not available for the input source(keyboard/mouse).

#> ddcutil detect
Display 1
I2C bus: /dev/i2c-3
DRM_connector: card1-DP-1
EDID synopsis:
Mfg id: SAM - Samsung Electric Company
Model: Odyssey G95NC
Product code: 29818 (0x747a)
Serial number: ************
Binary serial number: ************
Manufacture year: 2023, Week: 50
VCP version: 2.0

#> sudo ddcutil --bus=3 capabilities
Model: FALCON
MCCS version: 2.0
Commands:
Op Code: 01 (VCP Request)
Op Code: 02 (VCP Response)
Op Code: 03 (VCP Set)
Op Code: 07 (Timing Request)
Op Code: 0C (Save Settings)
Op Code: E3 (Capabilities Reply)
Op Code: F3 (Capabilities Request)
VCP Features:
Feature: 02 (New control value)
Feature: 04 (Restore factory defaults)
Feature: 05 (Restore factory brightness/contrast defaults)
Feature: 08 (Restore color defaults)
Feature: 10 (Brightness)
Feature: 12 (Contrast)
Feature: 14 (Select color preset)
Values:
05: 6500 K
08: 9300 K
0b: User 1
0c: User 2
Feature: 16 (Video gain: Red)
Feature: 18 (Video gain: Green)
Feature: 1A (Video gain: Blue)
Feature: 52 (Active control)
Feature: 60 (Input Source)
Values:
01: VGA-1
03: DVI-1
04: DVI-2
11: HDMI-1
12: HDMI-2
0f: DisplayPort-1
10: DisplayPort-2
Feature: 62 (Audio speaker volume)
Feature: 8D (Audio Mute)
Feature: FF (Manufacturer specific feature)

[chDemon]

Input Source + PIP/PBP DDC/CI Controls Missing or Non-Functional (Firmware M-C9557GGPA-1007.0)

Subject: Odyssey G95NC (57") – Incomplete / Broken DDC/CI Control (Input Source + PIP/PBP)

Firmware: M-C9557GGPA-1007.0

Product: Samsung Odyssey G95NC (57")

Firmware: M-C9557GGPA-1007.0

Connection modes tested: HDMI, DisplayPort, PIP, PBP

OS: Linux (X11), NVIDIA GPU

DDC tool: ddcutil (MCCS / VCP 2.0)

Summary

DDC/CI support on the Odyssey G95NC is incomplete and inconsistent for a monitor explicitly marketed for advanced multi-input use.

Specifically:

Input source selection via VCP 0x60 is incomplete

HDMI-1 and HDMI-2 are selectable via DDC/CI

HDMI-3 is not reliably selectable (or not selectable at all) via DDC/CI, despite being a valid on-screen input

PIP / PBP modes are not controllable via DDC/CI

There is no exposed, documented way to:

Enable/disable PIP

Enable/disable PBP

Select the secondary input source for PIP

Select the left/right inputs for PBP modes

This makes full automation of the monitor’s advertised capabilities impossible.

Observed Behavior

Input Source Control (VCP 0x60)

getvcp 60 correctly reports the current input when changed via the OSD.

setvcp 60 <value>:

Works reliably for HDMI-1 and HDMI-2

Does not work reliably for HDMI-3

Extensive testing (including brute-force VCP value scans with 5–10 second dwell per value) shows:

Many values are ignored or aliased

No deterministic, writable value exists for HDMI-3

This behavior is reproducible and persists across reboots.

PIP / PBP Control

No VCP features are exposed to:

Enable or disable PIP

Enable or disable PBP

Select the input used for PIP

Select the two inputs used for PBP

These features are only accessible via the on-screen menu.

Expected Behavior

For a monitor in this class, the following should be supported via DDC/CI:

All physical inputs (HDMI-1 / HDMI-2 / HDMI-3 / DP) should be:

Readable via VCP

Selectable via VCP

PIP and PBP modes should be controllable via DDC/CI, including:

PIP enable / disable

PBP enable / disable

Selection of the secondary PIP input

Selection of both inputs used in PBP modes

At minimum, these should be documented, stable, and deterministic.

Why This Matters

This is a premium, professional-grade monitor.

At this price point:

Reliable DDC/CI control is expected

Partial or undocumented DDC/CI implementations break:

Automated workflows

Multi-system desks

KVM-style setups

PIP/PBP use cases explicitly advertised for this model

Lower-cost monitors expose these controls correctly.

Request

Please treat this as a firmware defect or missing feature, not a usage issue.

Specifically:

Fix HDMI-3 input selection via DDC/CI

Expose DDC/CI controls for:

PIP enable/disable

PBP enable/disable

PIP input selection

PBP input selection

Or publish official documentation for the correct VCP codes if they already exist

Firmware currently tested: M-C9557GGPA-1007.0

Closing

This monitor is not inexpensive.

Its software and firmware support should match its positioning.

Please escalate this to the firmware/DDC implementation team.