[GH-ISSUE #1497] can't change brightness displayport to hdmi #2491 #844

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opened 2026-05-05 06:46:05 -06:00 by gitea-mirror · 0 comments

gitea-mirror commented

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

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Originally created by @xgiovio on GitHub (Jan 2, 2024).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1497

Before opening the issue, have you...?

Searched for existing issues
Read through the Monitor-Troubleshooting Wiki
Updated MonitorControl to the latest version (if applicable)

Describe the issue

Hello, 6800xt here with 3 output.
first monitor: Hdmi to hdmi monitor , brightness control ok
second monitor: displayport to hdmi, brightness control not working
third monitor: displayport to hdmi, brightness control not working (same monitor of the second one)

In windows, same setup with same card and monitor works without problems using apps like this
https://www.nirsoft.net/articles/change_monitor_contrast_command_line.html

Any helps?

Expected behavior

Bightness control should be ok

Anything else?

No response

Environment Information (please complete the following information)

- macOS version:14.2.1
- Mac model:Macpro7.1
- MonitorControl version:latest
- Monitor(s):3
- Monitor Cable(s)/Connection(s):check desc
- Apple Silicon/M1 (yes or no):no

Originally created by @xgiovio on GitHub (Jan 2, 2024). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1497 ### Before opening the issue, have you...? - [X] Searched for existing issues - [X] Read through [the Monitor-Troubleshooting Wiki](https://github.com/MonitorControl/MonitorControl/wiki/Monitor-Troubleshooting) - [X] Updated MonitorControl to the latest version (if applicable) ### Describe the issue Hello, 6800xt here with 3 output. first monitor: Hdmi to hdmi monitor , brightness control ok second monitor: displayport to hdmi, brightness control not working third monitor: displayport to hdmi, brightness control not working (same monitor of the second one) In windows, same setup with same card and monitor works without problems using apps like this https://www.nirsoft.net/articles/change_monitor_contrast_command_line.html Any helps? ### Expected behavior Bightness control should be ok ### Anything else? _No response_ ### Environment Information (please complete the following information) ```markdown - macOS version:14.2.1 - Mac model:Macpro7.1 - MonitorControl version:latest - Monitor(s):3 - Monitor Cable(s)/Connection(s):check desc - Apple Silicon/M1 (yes or no):no ```