[GH-ISSUE #490] No use for my dell u2720qm & M1 mac mini through usb-c cable #385

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opened 2026-05-05 05:53:26 -06:00 by gitea-mirror · 5 comments
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Originally created by @FRS666 on GitHub (Jul 31, 2021).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/490

Originally assigned to: @waydabber on GitHub.

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截屏2021-07-31 下午6 07 13

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Environment Information (please complete the following information):

  • macOS version:
  • MonitorControl version:v3.00-beta2
  • Monitor(s):dell u2720qm
  • Mac model:M1 mac mini
  • Monitor Cable(s)/Connection(s): (e.g. DisplayPort)usb-c cable
  • Apple Silicon/M1 (yes or no):yes
Originally created by @FRS666 on GitHub (Jul 31, 2021). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/490 Originally assigned to: @waydabber on GitHub. **Checklist** <!-- NOTE: M1/Apple Silicon is currently not supported, see: https://github.com/MonitorControl/MonitorControl/issues/323 --> <!-- Before you submit your issue, please make sure to check the following boxes by putting an x in the [ ] (don't: [x ], [ x], do: [x]) --> - [ ] I have searched for existing issues - [ ] I have looked through [the Monitor Troubleshooting wiki](https://github.com/MonitorControl/MonitorControl/wiki/Monitor-Troubleshooting) - [ ] I have updated MonitorControl to the latest version **Describe the issue** A clear and concise description of the problem. **Expected behavior** A clear and concise description of what you expected to happen. **Screenshots** If applicable, add screenshots to help explain your problem. <img width="982" alt="截屏2021-07-31 下午6 07 13" src="https://user-images.githubusercontent.com/75195948/127736532-3fba92d6-9af3-4d70-8240-54ee08210eed.png"> **Additional context** Add any other context about the problem here. **Environment Information (please complete the following information):** - macOS version: - MonitorControl version:v3.00-beta2 - Monitor(s):dell u2720qm - Mac model:M1 mac mini - Monitor Cable(s)/Connection(s): (e.g. DisplayPort)usb-c cable - Apple Silicon/M1 (yes or no):yes
gitea-mirror 2026-05-05 05:53:26 -06:00
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@waydabber commented on GitHub (Aug 11, 2021):

Hey @FRS666 - can you please try one of the recent betas (beta5, beta6) to see if any of them work? Thank you!

https://github.com/MonitorControl/MonitorControl/releases

<!-- gh-comment-id:897130293 --> @waydabber commented on GitHub (Aug 11, 2021): Hey @FRS666 - can you please try one of the recent betas (beta5, beta6) to see if any of them work? Thank you! https://github.com/MonitorControl/MonitorControl/releases
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@FRS666 commented on GitHub (Aug 12, 2021):

Both beta 5&6 work, great job bro.
but I see a new bug in beta6
the newly added Contrast adjustment cannot work well.
sometimes it just can't work, sometimes may cause the screen goes dark(It's not completely black, but the brightness has decreased)

thanks again for the great app, I enjoy a lot.

------------------ 原始邮件 ------------------
发件人: "MonitorControl/MonitorControl" @.>;
发送时间: 2021年8月12日(星期四) 凌晨4:29
@.
>;
抄送: "Nana @.@.>;
主题: Re: [MonitorControl/MonitorControl] No use for my dell u2720qm & M1 mac mini through usb-c cable (#490)

Hey @FRS666 - can you please try one of the recent betas (beta5, beta6) to see if any of them work? Thank you!

https://github.com/MonitorControl/MonitorControl/releases


You are receiving this because you were mentioned.
Reply to this email directly, view it on GitHub, or unsubscribe.
Triage notifications on the go with GitHub Mobile for iOS or Android.

<!-- gh-comment-id:897300287 --> @FRS666 commented on GitHub (Aug 12, 2021): Both beta 5&amp;6 work, great job bro. but I see a new bug in beta6 the newly added Contrast adjustment cannot work well. sometimes it just can't work, sometimes may cause the screen goes dark(It's not completely black, but the brightness has decreased) thanks again for the great app, I enjoy a lot. ------------------&nbsp;原始邮件&nbsp;------------------ 发件人: "MonitorControl/MonitorControl" ***@***.***&gt;; 发送时间:&nbsp;2021年8月12日(星期四) 凌晨4:29 ***@***.***&gt;; 抄送:&nbsp;"Nana ***@***.******@***.***&gt;; 主题:&nbsp;Re: [MonitorControl/MonitorControl] No use for my dell u2720qm &amp; M1 mac mini through usb-c cable (#490) Hey @FRS666 - can you please try one of the recent betas (beta5, beta6) to see if any of them work? Thank you! https://github.com/MonitorControl/MonitorControl/releases — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or unsubscribe. Triage notifications on the go with GitHub Mobile for iOS or Android.
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@waydabber commented on GitHub (Aug 12, 2021):

Can you try beta7? Does it work better? Thank you!

<!-- gh-comment-id:898006909 --> @waydabber commented on GitHub (Aug 12, 2021): Can you try beta7? Does it work better? Thank you!
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Owner

@FRS666 commented on GitHub (Aug 13, 2021):

Hi, bro
The contrast slider can work now, but it only can adjust my monitor's contrast from 25% to 100%(But it's already usable) 
What's more,
The volume control still can't work(both beta 5、6 & 7)

------------------ 原始邮件 ------------------
发件人: "MonitorControl/MonitorControl" @.>;
发送时间: 2021年8月13日(星期五) 上午6:22
@.
>;
抄送: "Nana @.@.>;
主题: Re: [MonitorControl/MonitorControl] No use for my dell u2720qm & M1 mac mini through usb-c cable (#490)

Can you try beta7? Does it work better? Thank you!


You are receiving this because you were mentioned.
Reply to this email directly, view it on GitHub, or unsubscribe.
Triage notifications on the go with GitHub Mobile for iOS or Android.

<!-- gh-comment-id:898146018 --> @FRS666 commented on GitHub (Aug 13, 2021): Hi, bro The contrast slider can work now, but it only can adjust my monitor's contrast from 25% to 100%(But it's already usable)&nbsp; What's more, The volume control still can't work(both beta 5、6 &amp; 7) ------------------&nbsp;原始邮件&nbsp;------------------ 发件人: "MonitorControl/MonitorControl" ***@***.***&gt;; 发送时间:&nbsp;2021年8月13日(星期五) 上午6:22 ***@***.***&gt;; 抄送:&nbsp;"Nana ***@***.******@***.***&gt;; 主题:&nbsp;Re: [MonitorControl/MonitorControl] No use for my dell u2720qm &amp; M1 mac mini through usb-c cable (#490) Can you try beta7? Does it work better? Thank you! — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or unsubscribe. Triage notifications on the go with GitHub Mobile for iOS or Android.
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@waydabber commented on GitHub (Aug 20, 2021):

Hi, it is considered normal that there is a lower limit for contrast control. The volume issue is strange - but it is only controlled if the display is set as volume out (using software like Boom or other app that adds a software layer over the direct DP digital audio will make this function not working) and some displays simply don't like their audio controlled via DDC.

Also you could try m1ddc to see if that can control the audio (if so, then the problem lies with MonitorControl).

I'll close this issue as this might be a display specific issue, but please feel free to reply and ask for a reopen if you think there is anything else for me to help with! Thank you!

<!-- gh-comment-id:902827901 --> @waydabber commented on GitHub (Aug 20, 2021): Hi, it is considered normal that there is a lower limit for contrast control. The volume issue is strange - but it is only controlled if the display is set as volume out (using software like Boom or other app that adds a software layer over the direct DP digital audio will make this function not working) and some displays simply don't like their audio controlled via DDC. Also you could try [m1ddc](https://github.com/waydabber/m1ddc) to see if that can control the audio (if so, then the problem lies with MonitorControl). I'll close this issue as this might be a display specific issue, but please feel free to reply and ask for a reopen if you think there is anything else for me to help with! Thank you!
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Reference: github-starred/MonitorControl#385
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