[GH-ISSUE #403] Dell U4021qw #321

New issue

Closed

opened 2026-05-05 05:44:37 -06:00 by gitea-mirror · 4 comments

gitea-mirror commented

2026-05-05 05:44:37 -06:00

Owner

Originally created by @rseckler on GitHub (Mar 12, 2021).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/403

Checklist

I have searched for existing issues
I have looked through the Monitor Troubleshooting wiki
I have updated MonitorControl to the latest version

Describe the issue
So the tool is not working with the new Dell U4021qw. I can control neither the brightness nor the volume. (See screenshots bellow.) I also tried with the ddcctl tool, screenshot attached as well. Not sure about the "Failed to poll the display". Couldn't find much on Google about this error.

Expected behavior
Well, the tool should work with this monitor. I checked, whether it supports control over DDC, and according to the manufacturer, it does.

Screenshots

Environment Information (please complete the following information):

macOS version: 11.2.3
MonitorControl version: 2.1.0
Monitor(s): Dell U4021qw
Mac model: MacBook Air M1
Monitor Cable(s)/Connection(s): USB-C / Thunderbolt, Original from Dell

Originally created by @rseckler on GitHub (Mar 12, 2021). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/403 **Checklist**  - [x] I have searched for existing issues - [x] I have looked through [the Monitor Troubleshooting wiki](https://github.com/MonitorControl/MonitorControl/wiki/Monitor-Troubleshooting) - [x] I have updated MonitorControl to the latest version **Describe the issue** So the tool is not working with the new Dell U4021qw. I can control neither the brightness nor the volume. (See screenshots bellow.) I also tried with the ddcctl tool, screenshot attached as well. Not sure about the "Failed to poll the display". Couldn't find much on Google about this error. **Expected behavior** Well, the tool should work with this monitor. I checked, whether it supports control over DDC, and according to the manufacturer, it does. **Screenshots** ![Bildschirmfoto 2021-03-12 um 10 11 27](https://user-images.githubusercontent.com/5329317/110918454-78dc6f00-831b-11eb-9075-675bf7c16aa4.png) **Environment Information (please complete the following information):** - macOS version: 11.2.3 - MonitorControl version: 2.1.0 - Monitor(s): Dell U4021qw - Mac model: MacBook Air M1 - Monitor Cable(s)/Connection(s): USB-C / Thunderbolt, Original from Dell

gitea-mirror

2026-05-05 05:44:37 -06:00

closed this issue
added the
monitor Issue
label

gitea-mirror commented

2026-05-05 05:44:41 -06:00

Author

Owner

@fifafu commented on GitHub (Mar 15, 2021):

FYI: It’s working fine on my Intel MBP using the same display, so the problem seems to be m1 specific. I can verify this weekend.

@fifafu commented on GitHub (Mar 15, 2021): FYI: It’s working fine on my Intel MBP using the same display, so the problem seems to be m1 specific. I can verify this weekend.

gitea-mirror commented

2026-05-05 05:44:43 -06:00

Author

Owner

@tgreco26 commented on GitHub (Mar 31, 2021):

I have this same issue but with Dell U4320Q. Was there any update on this? Thanks!

@tgreco26 commented on GitHub (Mar 31, 2021): I have this same issue but with Dell U4320Q. Was there any update on this? Thanks!

gitea-mirror commented

2026-05-05 05:44:45 -06:00

Author

Owner

@fifafu commented on GitHub (Mar 31, 2021):

It’s not possible due to system limitations on m1 https://github.com/MonitorControl/MonitorControl/issues/323#issuecomment-767022034

@fifafu commented on GitHub (Mar 31, 2021): It’s not possible due to system limitations on m1 https://github.com/MonitorControl/MonitorControl/issues/323#issuecomment-767022034

gitea-mirror commented

2026-05-05 05:44:46 -06:00

Author

Owner

@the0neyouseek commented on GitHub (Apr 1, 2021):

Related to #323

@the0neyouseek commented on GitHub (Apr 1, 2021): Related to #323