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[GH-ISSUE #431] LG 34WK95U-W controls not working #344

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opened 2026-05-05 05:47:47 -06:00 by gitea-mirror · 5 comments

gitea-mirror commented

2026-05-05 05:47:47 -06:00

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Originally created by @Max-Resilient on GitHub (Apr 28, 2021).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/431

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
A clear and concise description of the problem.
I am using an LG 34WK95U-W with a 2017 Macbook Pro 13" connected by Thunderbolt 3. Neither brightness nor volume controls work with this monitor. I connected a different HP Z27 Monitor (USB-C and not Thunderbolt 3) and brightness works, can't comment on volume since the HP has no speakers.
Expected behavior
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Environment Information (please complete the following information):

macOS version: 11.3
MonitorControl version: 2.1.0
Monitor(s): LG 34WK95U-W
Mac model: 2017 13 Macbook Pro i5 16GB Ram
Monitor Cable(s)/Connection(s): (e.g. DisplayPort) Thunderbolt 3

Originally created by @Max-Resilient on GitHub (Apr 28, 2021). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/431 **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** A clear and concise description of the problem. I am using an LG 34WK95U-W with a 2017 Macbook Pro 13" connected by Thunderbolt 3. Neither brightness nor volume controls work with this monitor. I connected a different HP Z27 Monitor (USB-C and not Thunderbolt 3) and brightness works, can't comment on volume since the HP has no speakers. **Expected behavior** A clear and concise description of what you expected to happen. **Screenshots** If applicable, add screenshots to help explain your problem. **Additional context** Add any other context about the problem here. **Environment Information (please complete the following information):** - macOS version: 11.3 - MonitorControl version: 2.1.0 - Monitor(s): LG 34WK95U-W - Mac model: 2017 13 Macbook Pro i5 16GB Ram - Monitor Cable(s)/Connection(s): (e.g. DisplayPort) Thunderbolt 3

gitea-mirror

2026-05-05 05:47:47 -06:00

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gitea-mirror commented

2026-05-05 05:47:51 -06:00

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@cybertask commented on GitHub (Apr 29, 2021):

Yes, me too, the app no longer working after updating to big sur 11.3

@cybertask commented on GitHub (Apr 29, 2021): Yes, me too, the app no longer working after updating to big sur 11.3

gitea-mirror commented

2026-05-05 05:47:54 -06:00

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@Max-Resilient commented on GitHub (Apr 29, 2021):

I had the problem before the update too.

@Max-Resilient commented on GitHub (Apr 29, 2021): I had the problem before the update too.

gitea-mirror commented

2026-05-05 05:47:56 -06:00

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@sanguino commented on GitHub (May 1, 2021):

I bought this monitor today, and at first I also have the same issues, and others related to resolution and color schemes in osx.

After updating the firmware, and configuring it to use display port 1.4 (from the OSD menu), it works as expected. Keep in mind that if the brightness is in automatic it does not allow to control it, so I deactivate automatic brightness too.

Now I'm looking for how to control it from the touch bar, because if I use the lg as output, the volume control is deactivated, and the brightness only controls the macbook monitor.

I hope it helps.

@sanguino commented on GitHub (May 1, 2021): I bought this monitor today, and at first I also have the same issues, and others related to resolution and color schemes in osx. After updating the firmware, and configuring it to use display port 1.4 (from the OSD menu), it works as expected. Keep in mind that if the brightness is in automatic it does not allow to control it, so I deactivate automatic brightness too. Now I'm looking for how to control it from the touch bar, because if I use the lg as output, the volume control is deactivated, and the brightness only controls the macbook monitor. I hope it helps.

gitea-mirror commented

2026-05-05 05:47:58 -06:00

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@Max-Resilient commented on GitHub (May 2, 2021):

I bought this monitor today, and at first I also have the same issues, and others related to resolution and color schemes in osx.

After updating the firmware, and configuring it to use display port 1.4 (from the OSD menu), it works as expected. Keep in mind that if the brightness is in automatic it does not allow to control it, so I deactivate automatic brightness too.

Now I'm looking for how to control it from the touch bar, because if I use the lg as output, the volume control is deactivated, and the brightness only controls the macbook monitor.

I hope it helps.

That sounds very possible, I cannot find a firmware update for this monitor.

Without firmware update, if I switch to Display port 1.4 the resolution is messed up and the ratio is no longer Ultrawide. I read someone else has that issue with the same with the MacBook Pro 2017, http://lgcommunity.us.com/discussion/16546/lg-34wk95u-w-doesnt-have-correct-resolution-hdr-via-thunderbolt3-and-dp1-4-on-mac

Also, is it true that the in box cable only transmits 20GB/s?

@Max-Resilient commented on GitHub (May 2, 2021): > I bought this monitor today, and at first I also have the same issues, and others related to resolution and color schemes in osx. > > > > After updating the firmware, and configuring it to use display port 1.4 (from the OSD menu), it works as expected. Keep in mind that if the brightness is in automatic it does not allow to control it, so I deactivate automatic brightness too. > > > > Now I'm looking for how to control it from the touch bar, because if I use the lg as output, the volume control is deactivated, and the brightness only controls the macbook monitor. > > > > I hope it helps. That sounds very possible, I cannot find a firmware update for this monitor. Without firmware update, if I switch to Display port 1.4 the resolution is messed up and the ratio is no longer Ultrawide. I read someone else has that issue with the same with the MacBook Pro 2017, http://lgcommunity.us.com/discussion/16546/lg-34wk95u-w-doesnt-have-correct-resolution-hdr-via-thunderbolt3-and-dp1-4-on-mac Also, is it true that the in box cable only transmits 20GB/s?

gitea-mirror commented

2026-05-05 05:47:59 -06:00

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@JoniVR commented on GitHub (May 2, 2021):

Closing in favour of #224

@JoniVR commented on GitHub (May 2, 2021): Closing in favour of #224