# MSI Optix G27C2: mapping its DDC/CI monitor controls

> The MSI Optix G27C2 reference maps the monitor's DDC/CI controls from Windows API reads and writes on one unit. It records VCP codes for brightness, contrast, colour presets and input selection, along with I2C pacing, ignored writes and EDID data.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/immortalbob/msi-optix-g27c2-protocol>
- Primary source: <https://github.com/immortalbob/msi-optix-g27c2-protocol/blob/8ec7a2369fa09ab1489b5d09ce4d8379d0acd1d0/msi-optix-g27c2-ddc.md>
- Catalog page: <https://awesomerea.org/resources/msi-optix-g27c2-protocol-case/>
- Record JSON: <https://awesomerea.org/resources/msi-optix-g27c2-protocol-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/msi-optix-g27c2-protocol-case/index.md)

## Requirements & limits

- **Scope:** The observations concern one G27C2 connected over DisplayPort to Windows.
- **Limits:** Other firmware revisions and HDMI input numbers are unexamined.
- **License:** CC BY 4.0; attribution is required.

## Primary sources

1. <https://github.com/immortalbob/msi-optix-g27c2-protocol/blob/8ec7a2369fa09ab1489b5d09ce4d8379d0acd1d0/msi-optix-g27c2-ddc.md>
2. <https://github.com/immortalbob/msi-optix-g27c2-protocol/blob/8ec7a2369fa09ab1489b5d09ce4d8379d0acd1d0/README.md>
3. <https://github.com/immortalbob/msi-optix-g27c2-protocol/blob/8ec7a2369fa09ab1489b5d09ce4d8379d0acd1d0/LICENSE>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.