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[GH-ISSUE #399] MacBook Pro2018 connected to Dell U2720QM monitor cannot adjust the volume of the monitor #317

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opened 2026-05-05 05:44:10 -06:00 by gitea-mirror · 6 comments

gitea-mirror commented

2026-05-05 05:44:10 -06:00

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Originally created by @OAFROG on GitHub (Mar 2, 2021).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/399

Originally assigned to: @waydabber on GitHub.

Press the shortcut key to display the volume adjustment prompt box, but the volume has not changed in fact

System 10.15.7

Originally created by @OAFROG on GitHub (Mar 2, 2021). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/399 Originally assigned to: @waydabber on GitHub. Press the shortcut key to display the volume adjustment prompt box, but the volume has not changed in fact System 10.15.7

gitea-mirror

2026-05-05 05:44:10 -06:00

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gitea-mirror commented

2026-05-05 05:44:16 -06:00

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@kasparv commented on GitHub (Mar 18, 2021):

Reproduced on MacBook Air (Retina, 13-inch, 2020) with Catalina 10.15.7 (19H524), MonitorControl Version 2.1.0 (Build 721)

@kasparv commented on GitHub (Mar 18, 2021): Reproduced on MacBook Air (Retina, 13-inch, 2020) with Catalina 10.15.7 (19H524), MonitorControl Version 2.1.0 (Build 721)

gitea-mirror commented

2026-05-05 05:44:18 -06:00

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@TheUKDave commented on GitHub (Apr 27, 2021):

Also an issue with my U2720Q, connected over USB-C to my 2020 MBP16, Catalina 10.15.7, MonitorControl 2.1.0

Both brightness and volume are greyed in the tray icon, but sliders are movable (but do nothing). Keyboard shortcuts for volume make the MacOS speaker icon appear and make the 'blip' noises, but volume is unaffected - even muting seems to show it muted, but sound is still heard always at the same original volume.

Is it a monitor incompatibility? is it due to using USB-C?

@TheUKDave commented on GitHub (Apr 27, 2021): Also an issue with my U2720Q, connected over USB-C to my 2020 MBP16, Catalina 10.15.7, MonitorControl 2.1.0 Both brightness and volume are greyed in the tray icon, but sliders are movable (but do nothing). Keyboard shortcuts for volume make the MacOS speaker icon appear and make the 'blip' noises, but volume is unaffected - even muting seems to show it muted, but sound is still heard always at the same original volume. Is it a monitor incompatibility? is it due to using USB-C?

gitea-mirror commented

2026-05-05 05:44:21 -06:00

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@nvcken commented on GitHub (May 10, 2021):

Hi @he675724590 @kasparv @TheUKDave do you resolve this ? I got the same on U2520D

@nvcken commented on GitHub (May 10, 2021): Hi @he675724590 @kasparv @TheUKDave do you resolve this ? I got the same on U2520D

gitea-mirror commented

2026-05-05 05:44:23 -06:00

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@TheUKDave commented on GitHub (May 10, 2021):

@nvcken No I didn't, using eqmac instead now, which works.

@TheUKDave commented on GitHub (May 10, 2021): @nvcken No I didn't, using eqmac instead now, which works.

gitea-mirror commented

2026-05-05 05:44:26 -06:00

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@nvcken commented on GitHub (May 17, 2021):

ok thx, btw @TheUKDave can't use microphone when plus in headphone into monitor 3.5mm sound port, is it right?

@nvcken commented on GitHub (May 17, 2021): ok thx, btw @TheUKDave can't use microphone when plus in headphone into monitor 3.5mm sound port, is it right?

gitea-mirror commented

2026-05-05 05:44:30 -06:00

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@waydabber commented on GitHub (Aug 21, 2021):

Hey all,

if brightness control works but volume control does not, then it is probably not a communications issue but the display itself does not support properly the audioSpeakerVolume DDC command. Unfortunatelly there is no much to do about that, a software solution could be instead (like eqMac or SoundSource).

Also, you could try ddctl or m1ddc to see if that works to double check that indeed the problem lies with the Display:

https://github.com/MonitorControl/MonitorControl/wiki/Monitor-Troubleshooting

I'll close this issue now but feel free to let me know if there is anything else I can help with or you want to try to debug one of these displays.

Thank you!

@waydabber commented on GitHub (Aug 21, 2021): Hey all, if brightness control works but volume control does not, then it is probably not a communications issue but the display itself does not support properly the audioSpeakerVolume DDC command. Unfortunatelly there is no much to do about that, a software solution could be instead (like eqMac or SoundSource). Also, you could try ddctl or m1ddc to see if that works to double check that indeed the problem lies with the Display: https://github.com/MonitorControl/MonitorControl/wiki/Monitor-Troubleshooting I'll close this issue now but feel free to let me know if there is anything else I can help with or you want to try to debug one of these displays. Thank you!