[GH-ISSUE #302] no individual brightness control with two screens connected via TB3 (direct or daisy-chained) #235

New issue

Closed

opened 2026-05-05 05:28:34 -06:00 by gitea-mirror · 1 comment

gitea-mirror commented

2026-05-05 05:28:34 -06:00

Owner

Originally created by @themaxx32000 on GitHub (Oct 5, 2020).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/302

Checklist

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

Describe the bug
Two BenQ PD2720U daisy-chained (TB3) and connected to a Mac mini show up as two devices with two separate IDs however brightness control only changes the brightness of one screen (the last one in the chain).

Also brightness control does not work for both screens if connected directly (i.e. not daisy-chained) (this way the two screens also show up as two devices with two separate IDs).

To Reproduce
Connect two BenQ PD2720U screens either directly with two TB3 cables or daisy-chained via TB3.

Expected behavior
Enable brightness-control per screen (right-click menu shows two screens which should allow brightness control of each).

Screenshots

Environment Information:

macOS version: 10.15.6 (19G2021)
MonitorControl version: 2.1.0 (Build 721)
Monitors: 2x BenQ PD2720U

Originally created by @themaxx32000 on GitHub (Oct 5, 2020). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/302 **Checklist** - [x] I have searched for existing issues - [x] I have looked through [the wiki](https://github.com/MonitorControl/MonitorControl/wiki) - [x] I have updated MonitorControl to the latest version **Describe the bug** Two BenQ PD2720U daisy-chained (TB3) and connected to a Mac mini show up as two devices with two separate IDs however brightness control only changes the brightness of one screen (the last one in the chain). Also brightness control does not work for both screens if connected directly (i.e. not daisy-chained) (this way the two screens also show up as two devices with two separate IDs). **To Reproduce** Connect two BenQ PD2720U screens either directly with two TB3 cables or daisy-chained via TB3. **Expected behavior** Enable brightness-control per screen (right-click menu shows two screens which should allow brightness control of each). **Screenshots** ![right-click-menu](https://user-images.githubusercontent.com/303534/95066401-a553e580-0702-11eb-938d-f889c89499ff.jpg) ![monitor](https://user-images.githubusercontent.com/303534/95066399-a4bb4f00-0702-11eb-9c9f-3be032d983f4.jpg) ![advanced](https://user-images.githubusercontent.com/303534/95066395-a258f500-0702-11eb-87fb-1566861c7960.jpg) **Environment Information:** - macOS version: 10.15.6 (19G2021) - MonitorControl version: 2.1.0 (Build 721) - Monitors: 2x BenQ PD2720U