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Monitor Behavior Reference — Samsung LS24D300G

This document records confirmed and unconfirmed behaviors of the Samsung LS24D300G when controlled via DDC/CI from an Apple Silicon Mac using m1ddc.

Entries are explicitly labeled to distinguish facts from hypotheses.

Hardware Configuration Tested

Item Value
Monitor model Samsung LS24D300G
Mac connection HDMI
Secondary connection VGA (separate machine)
macOS Apple Silicon (M4)
DDC/CI tool m1ddc (Homebrew)

Confirmed Behaviors

Behavior Notes
m1ddc display 1 get luminance returns a value DDC read works over HDMI
set luminance changes panel brightness in real time DDC write works over HDMI
set contrast changes panel contrast in real time DDC write works over HDMI
set input 1 switches HDMI → VGA Confirmed working
After set input 1, set luminance still changes the panel DDC transport over HDMI remains active while VGA is displayed
ddcctl fails with framebuffer acquisition error Not usable on this macOS build with Apple Silicon

Unconfirmed / Open Questions

Behavior Status Notes
set input <X> switches VGA → HDMI ⚠️ Open No candidate code confirmed yet; see candidate table below
get input returns a reliable value while on VGA ⚠️ Unclear Samsung firmware may not respond to reads from the non-active input
set input-alt 144 switches to HDMI ⚠️ Untested Extended encoding candidate
DDC/CI works over VGA (from the Windows side) ⚠️ Untested Required for the ControlMyMonitor method

Candidate HDMI Input Codes

These have been collected from DDC standards, Samsung community reports, and firmware captures. None are confirmed on this specific unit yet.

Code Command Source
5 m1ddc display 1 set input 5 Standard VCP HDMI value
17 m1ddc display 1 set input 17 Samsung DDC captures
3 m1ddc display 1 set input 3 VCP alternative
6 m1ddc display 1 set input 6 Community reports
18 m1ddc display 1 set input 18 Community reports
144 m1ddc display 1 set input-alt 144 Samsung extended encoding

Community Findings (Other Hardware)

If you test a code and it works (or doesn't), please open a PR to add a row here.

Reporter Monitor variant Firmware HDMI code VGA code
(open — contributions welcome)

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