Comments (1)
First, does the monitor use a VCP feature code to control the reference mode? If so, it's likely feature x14 (Select Color Preset), but it could be a manufacturer reserved feature (xE0..xFF).
If the monitor supports DDC/CI, you can use ddcutil to probe if the there's a feature value that changes when you change the color reference mode in the OSD. ddcutil getvcp scan will check every feature value.
If a monitor's setting are controllable using USB, the question is whether it adheres to the
USB Monitor Control Class Specification for communicating with the monitor's Virtual Control Panel. ddcutil can communicate with it only if it adheres to the spec. By default, USB support is disabled in ddcutil, option --enable-usb enables it. To see if your monitor adheres to the spec, use ddcutil detect --enable-usb.
If the monitor is controllable via USB but does not support the spec, your only option is to use the Windows app to change monitor settings and trace the packets on the USB bus.
Finally, the manufacturer may supply a proprietary API for controlling the monitor. For example, the Z27x API has a set of functions for managing the color space.
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Related Issues (20)
- Enhancement - consider packaging module loading HOT 2
- "Keeping adjust sleep multiplier" warning shown many times HOT 1
- Monitor resets many times on boot after new udev rule installed HOT 44
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- No (DisplayLink) displays found on 2.1.4, but works on 2.0.0 HOT 6
- ddcutil 2.1.4-1: DDC communication failed HOT 3
- [debian] updating linux-image pkg fails due to ddcutil dkms module failure HOT 2
- Cannot get capabilities: Maximum DDC retries exceeded. HOT 8
- Add an option to return the capabilities for a specific feature. HOT 4
- DDC communication failed (getvcp of feature x10 returned Error_Info[DDCRC_RETRIES in ddc_write_read_with_retry, causes: DDCRC_DDC_DATA(15)]) HOT 1
- Ddcutil crashes when some usb devices are connected HOT 1
- `ddcutil` ignores the final entry in `XDG_DATA_DIRS` when looking for an `mccs` file HOT 1
- Cannot update beyond 1.2.2-1 HOT 2
- Samsung C24F390 - DDC communication failed HOT 1
- ddcui controls smaller than font size on Ubuntu 24.04 HOT 1
- Can't set contrast on LG 27UN880-B.AEU HOT 2
- make: deletes build_details.h before use HOT 1
- UGREEN Revodok Pro 308: ddcutil works with 1 display but not with 2 HOT 5
- Invalid checksum of Debian Trixie package HOT 2
- DDC Communication failed. [EIO in ddc_write_read_with_retry, causes: EIO] HOT 2
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