[GH-ISSUE #1872] LG UltraGear 45GX950A (5K2K OLED): capability report + non-standard input VCP codes #1301

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opened 2026-10-02 22:07:17 -06:00 by gitea-mirror · 0 comments

gitea-mirror commented

2026-10-02 22:07:17 -06:00

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Originally created by @gmarmat on GitHub (May 20, 2026).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1872

Capability report for the LG UltraGear 45GX950A (45" curved 5K2K OLED, released 2026). MonitorControl works on this monitor out of the box. Posting the details for the supported-displays list and for anyone searching for this model.

Setup

MacBook Pro M4 (Mac16,1), macOS 26.4.1
MonitorControl 4.3.3 (installed via Homebrew cask)
LG 45GX950A over USB-C / DisplayPort Alt Mode
DDC/CI enabled in the monitor OSD

What works

Brightness via F1/F2
Volume via F11/F12
Contrast slider in app preferences
Input source switching via m1ddc set input-alt <code>

Quirks worth documenting

Volume granularity. The 45GX950A exposes ~17 discrete DDC volume steps (~6% per step). The monitor's DDC firmware caps this. Same step size with m1ddc set volume, direct DDC writes, and other DDC-based apps. Not a MonitorControl issue, but worth mentioning if a user files "volume jumps in 6% increments" against this model.

Channel reporting. The monitor identifies as 8-channel over DisplayPort. Some apps (Microsoft Teams in particular) filter it out of their speaker dropdowns as a result. Unrelated to MonitorControl, listing for completeness.

Non-standard input VCP codes

The 45GX950A uses non-spec values for VCP 0x60 (input source). Confirmed by reading the current input via m1ddc input-alt while switching sources from the joystick:

Input	VCP value (decimal)
USB-C / Thunderbolt	15
DisplayPort 1	208
DisplayPort 2	209
HDMI 1	144
HDMI 2	145

Spec values for DP1/DP2/HDMI1/HDMI2 are typically 15/16/17/18. The higher values may apply to other 2026 LG OLED UltraGear models. If anyone on a recent LG hits input-switch failures with the standard codes, these are worth trying.

Happy to test additional VCP codes if useful.

Originally created by @gmarmat on GitHub (May 20, 2026). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1872 Capability report for the LG UltraGear 45GX950A (45" curved 5K2K OLED, released 2026). MonitorControl works on this monitor out of the box. Posting the details for the supported-displays list and for anyone searching for this model. ## Setup - MacBook Pro M4 (Mac16,1), macOS 26.4.1 - MonitorControl 4.3.3 (installed via Homebrew cask) - LG 45GX950A over USB-C / DisplayPort Alt Mode - DDC/CI enabled in the monitor OSD ## What works - Brightness via F1/F2 - Volume via F11/F12 - Contrast slider in app preferences - Input source switching via `m1ddc set input-alt <code>` ## Quirks worth documenting **Volume granularity.** The 45GX950A exposes ~17 discrete DDC volume steps (~6% per step). The monitor's DDC firmware caps this. Same step size with `m1ddc set volume`, direct DDC writes, and other DDC-based apps. Not a MonitorControl issue, but worth mentioning if a user files "volume jumps in 6% increments" against this model. **Channel reporting.** The monitor identifies as 8-channel over DisplayPort. Some apps (Microsoft Teams in particular) filter it out of their speaker dropdowns as a result. Unrelated to MonitorControl, listing for completeness. ## Non-standard input VCP codes The 45GX950A uses non-spec values for VCP `0x60` (input source). Confirmed by reading the current input via `m1ddc input-alt` while switching sources from the joystick: | Input | VCP value (decimal) | |---|---| | USB-C / Thunderbolt | 15 | | DisplayPort 1 | 208 | | DisplayPort 2 | 209 | | HDMI 1 | 144 | | HDMI 2 | 145 | Spec values for DP1/DP2/HDMI1/HDMI2 are typically 15/16/17/18. The higher values may apply to other 2026 LG OLED UltraGear models. If anyone on a recent LG hits input-switch failures with the standard codes, these are worth trying. Happy to test additional VCP codes if useful.

gitea-mirror closed this issue

2026-10-02 22:07:18 -06:00

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