[GH-ISSUE #387] LG 34WL850-W not supported #305

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opened 2026-05-05 05:43:26 -06:00 by gitea-mirror · 2 comments

gitea-mirror commented

2026-05-05 05:43:26 -06:00

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Originally created by @zar0ku1 on GitHub (Feb 6, 2021).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/387

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
The LG 34WL850-W has DDC switched on but the monitor appears as not supported and none of the actions (brightness or volume) work.

Expected behavior
The LG 34WL850-W to be recognised as LG 34WL850-W and all the actions (brightness or volume) to work.

Screenshots

Additional context

ddcctl -d 1 -v 30
D: CGDisplay 4E453C1D-C716-7451-0857-D6964E3302DB dispID(#2) (3440x1440 0°) 109.00 DPI
I: found 1 external display
E: Failed to find display in WindowServer's preferences! (/Library/Preferences/com.apple.windowserver.plist)
I: polling EDID for #1 (ID 2 => (null))
E: Failed to poll display!

Environment Information (please complete the following information):

macOS version: 11.2
MonitorControl version: 2.1.0 (Build 721)
Monitor(s): LG 34WL850-W
Mac model: Mac mini (M1, 2020)
Monitor Cable(s)/Connection(s): Thunderbolt

Originally created by @zar0ku1 on GitHub (Feb 6, 2021). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/387 **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** The [LG 34WL850-W](https://www.lg.com/us/monitors/lg-34WL850-W-ultrawide-monitor) has DDC switched on but the monitor appears as not supported and none of the actions (brightness or volume) work. **Expected behavior** The LG 34WL850-W to be recognised as LG 34WL850-W and all the actions (brightness or volume) to work. **Screenshots** ![Снимок экрана 2021-02-07 в 10 14 30](https://user-images.githubusercontent.com/2253124/107131771-9b9af280-692d-11eb-9ec8-bf95db9db1ac.png) ![Снимок экрана 2021-02-07 в 10 14 37](https://user-images.githubusercontent.com/2253124/107131773-9fc71000-692d-11eb-8c83-5cbc4dfc60f4.png) **Additional context** > ddcctl -d 1 -v 30 > D: CGDisplay 4E453C1D-C716-7451-0857-D6964E3302DB dispID(#2) (3440x1440 0°) 109.00 DPI > I: found 1 external display > E: Failed to find display in WindowServer's preferences! (/Library/Preferences/com.apple.windowserver.plist) > I: polling EDID for #1 (ID 2 => (null)) > E: Failed to poll display! **Environment Information (please complete the following information):** - macOS version: 11.2 - MonitorControl version: 2.1.0 (Build 721) - Monitor(s): LG 34WL850-W - Mac model: Mac mini (M1, 2020) - Monitor Cable(s)/Connection(s): Thunderbolt