Samsung LC34G55T volume control is not working

[Delitants]

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Describe the issue

Samsung LC34G55T volume control is not working. Period.

Expected behavior

So volume to change

Anything else?

There is no DDC settings in the monitor menu

Environment Information (please complete the following information)

- macOS version: 11.6
- Mac model: Intel
- MonitorControl version: 4.0.2
- Monitor(s): Samsung LC34G55T
- Monitor Cable(s)/Connection(s): HDMI
- Apple Silicon/M1 (yes or no): no

[the0neyouseek]

Hi @Neolo
Just reading quickly it doesn't seems like the LC34G55T has integrated speakers ? Do you wish to control you mac internal speakers ?

[Delitants]

It has audio jack output for external speakers. Volume is controlled by monitor button only.

[jperkin]

I'm seeing the same with my Samsung LF32TU87, though in this case I'm connected over Thunderbolt, and have an M1.

The display controls work ok, though I have to use "Software (gamma, forced)", otherwise it only starts dimming the screen at around 60%. However the audio controls do nothing, even though the icon shows up and is adjusting as expected, the output volume through the speakers remains unchanged.

This is all with the latest 4.1.0.

[x-magic]

The display controls work ok, though I have to use "Software (gamma, forced)", otherwise it only starts dimming the screen at around 60%. However the audio controls do nothing, even though the icon shows up and is adjusting as expected, the output volume through the speakers remains unchanged.

I'm using Dell U4320Q and have the same issue - if the display is connected via DP or USB-C alt mode directly, DDC works for both picture and sound. But if connected via a Thunderbolt dock, only software control works. DDC can still be detected however, just controls won't work anymore.

Maybe there should be a separate issue with Thunderbolt dock users? I assume DDC simply doesn't work through a dock.

[txoof]

Similar issue using a Dell U2723QE over a display port connection. The monitor has no internal speakers.
Setup:

• M1 Mac Mini Monterey 12.5
• Display Port Connection to U2723QE
• Powered speakers connected via 2.5mm jack

Symptoms:

• Output volume does not follow adjustments made via keyboard or MonitorControl app.
• Display dimming works as expected
• Volume control overlay appears and works as expected, when using F10-F12
• Volume slider in menu bar appears and can be adjusted

I think the U2723QE may have some sort of dock internally as it has a KVM switching capability so this may be related to @x-magic 's problem.

[samugem]

I have same issue with my Samsung S27HG5x when using usb c dock. If I use only usb c-hdmi adapter all works perfectly.

[waydabber]

Many displays do not properly support volume control over DDC. If brightness control works properly (not only the bottom 50% which indicates that DDC control is not working at all, either because of the use of the built-in HDMI port or lack of display support) and volume control does not, then there is nothing to do on the app side, but the display's firmware is at fault.