[GH-ISSUE #553] Dell 2721H No Audio Control #417

New issue

Closed

opened 2026-05-05 05:57:58 -06:00 by gitea-mirror · 1 comment

gitea-mirror commented

2026-05-05 05:57:58 -06:00

Owner

Originally created by @thezdman on GitHub (Sep 1, 2021).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/553

Originally assigned to: @waydabber on GitHub.

Before opening the issue, have you...?

Searched for existing issues
I have read through the Monitor-Troubleshooting Wiki
Updated MonitorControl to the latest version (if applicable)

Describe the issue

Volume not working (no slider available) for Dell 2721H monitor.

Expected behavior

expect to see volume control when clicking icon

Anything else?

Environment Information (please complete the following information)

- macOS version:11.5.2
- Mac model:M1 Mini
- MonitorControl version:3.0.0 build 2869 Apple Silicon
- Monitor(s):Dell S2721H
- Monitor Cable(s)/Connection(s):HDMI
- Apple Silicon/M1 (yes or no):YEs

Originally created by @thezdman on GitHub (Sep 1, 2021). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/553 Originally assigned to: @waydabber on GitHub. ### Before opening the issue, have you...? - [X] Searched for existing issues - [X] I have read through [the Monitor-Troubleshooting Wiki](https://github.com/MonitorControl/MonitorControl/wiki/Monitor-Troubleshooting) - [X] Updated MonitorControl to the latest version (if applicable) ### Describe the issue Volume not working (no slider available) for Dell 2721H monitor. ### Expected behavior expect to see volume control when clicking icon ### Anything else? ![Screen Shot 2021-09-01 at 2 12 16 PM](https://user-images.githubusercontent.com/89939524/131730510-be2b470e-da7e-4423-9fbc-d8d3493b1f36.png) ### Environment Information (please complete the following information) ```markdown - macOS version:11.5.2 - Mac model:M1 Mini - MonitorControl version:3.0.0 build 2869 Apple Silicon - Monitor(s):Dell S2721H - Monitor Cable(s)/Connection(s):HDMI - Apple Silicon/M1 (yes or no):YEs ```

gitea-mirror closed this issue

2026-05-05 05:58:01 -06:00

gitea-mirror commented

2026-05-05 05:58:05 -06:00

Author

Owner

@waydabber commented on GitHub (Sep 1, 2021):

Hi @thezdman, the 2018 Intel mini and the 2020 M1 mini does not support DDC control over the HDMI port (the required i2c communication channel is being blocked, this is probably a design issue on Apple's part). You need to use one of the USB-C ports (using an USB-C to HDMI dongle is fine, most - but not all - support passing through DDC commands). This is why you see Software Only as Control method instead of Hardware (DDC).

Since there is no much to do about this, I'll close this issue for now, but feel free to comment anyway if I can be of any help with this or you have further questions! :)

@waydabber commented on GitHub (Sep 1, 2021): Hi @thezdman, the 2018 Intel mini and the 2020 M1 mini does not support DDC control over the HDMI port (the required i2c communication channel is being blocked, this is probably a design issue on Apple's part). You need to use one of the USB-C ports (using an USB-C to HDMI dongle is fine, most - but not all - support passing through DDC commands). This is why you see `Software Only` as Control method instead of `Hardware (DDC)`. Since there is no much to do about this, I'll close this issue for now, but feel free to comment anyway if I can be of any help with this or you have further questions! :)