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[GH-ISSUE #304] Philips 499p9 with eGPU not working #239

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opened 2026-05-05 05:29:10 -06:00 by gitea-mirror · 7 comments

gitea-mirror commented

2026-05-05 05:29:10 -06:00

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Originally created by @bargald on GitHub (Oct 12, 2020).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/304

Checklist

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

Describe the bug
when connecting a display using an external gpu, the brightness control doesn't work. When changing brightness the screen flickers but always return to the same brightness level.

To Reproduce
Steps to reproduce the behavior:

connect MacBook to an egpu
connect a display to the egpu
try to change display brightness using monitorControl

Expected behavior
Screen should change brightness

Additional context

changing brightness works when connecting the display directly to the computer, not using an egpu.
tried using HDMI and DisplayPort cables

Environment Information (please complete the following information):

macOS version: Catalina 10.15.7
MonitorControl version: V. 2.1.0 build 721
Monitor(s): Philips 499p9

Originally created by @bargald on GitHub (Oct 12, 2020). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/304 **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** when connecting a display using an external gpu, the brightness control doesn't work. When changing brightness the screen flickers but always return to the same brightness level. **To Reproduce** Steps to reproduce the behavior: 1. connect MacBook to an egpu 2. connect a display to the egpu 3. try to change display brightness using monitorControl **Expected behavior** Screen should change brightness **Additional context** - changing brightness works when connecting the display directly to the computer, not using an egpu. - tried using HDMI and DisplayPort cables **Environment Information (please complete the following information):** - macOS version: Catalina 10.15.7 - MonitorControl version: V. 2.1.0 build 721 - Monitor(s): Philips 499p9

gitea-mirror

2026-05-05 05:29:10 -06:00

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gitea-mirror commented

2026-05-05 05:29:16 -06:00

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@jererobles commented on GitHub (Nov 13, 2020):

Same issue. Not eGPU but using CalDigit dock. DisplayPort N°1 works OK, port N°2 doesn't no matter switching monitor or cable.

@jererobles commented on GitHub (Nov 13, 2020): Same issue. Not eGPU but using CalDigit dock. DisplayPort N°1 works OK, port N°2 doesn't no matter switching monitor or cable.

gitea-mirror commented

2026-05-05 05:29:18 -06:00

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@JoniVR commented on GitHub (Nov 22, 2020):

This feels like a setup issue, not an eGPU issue. How do I know this? I've been using an eGPU for years now with MonitorControl and it's working for me, I also know there are other people who have it working with their eGPU.

I suggest you try some of the suggestions in the Troubleshooting wiki.

If that doesn't help then I'm afraid there's probably not much we can do right now.

@JoniVR commented on GitHub (Nov 22, 2020): This feels like a setup issue, not an eGPU issue. How do I know this? I've been using an eGPU for years now with MonitorControl and it's working for me, I also know there are other people who have it working with their eGPU. I suggest you try some of the suggestions in the [Troubleshooting wiki](https://github.com/MonitorControl/MonitorControl/wiki/Monitor-Troubleshooting). If that doesn't help then I'm afraid there's probably not much we can do right now.

gitea-mirror commented

2026-05-05 05:29:21 -06:00

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@JoniVR commented on GitHub (Nov 22, 2020):

@bargald which eGPU enclosure and card?
@jererobles What does your setup look like?

@JoniVR commented on GitHub (Nov 22, 2020): @bargald which eGPU enclosure and card? @jererobles What does your setup look like?

gitea-mirror commented

2026-05-05 05:29:22 -06:00

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@bargald commented on GitHub (Nov 22, 2020):

@bargald which eGPU enclosure and card?
@jererobles What does your setup look like?

I use the Sonnet Breakaway box 650W, with AMD Radeon RX 580 8 GB

@bargald commented on GitHub (Nov 22, 2020): > @bargald which eGPU enclosure and card? > @jererobles What does your setup look like? I use the Sonnet Breakaway box 650W, with AMD Radeon RX 580 8 GB

gitea-mirror commented

2026-05-05 05:29:24 -06:00

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@jererobles commented on GitHub (Nov 22, 2020):

@JoniVR my setup is

 MBP 16"  --TB3--> Caldigit USB-C Pro Dock --DP--> Dell U2713HM
                                          --DP--> LG 27UL650

You're right, this is not using eGPU.
MBP has AMD Radeon Pro 5500M 4 GB

@jererobles commented on GitHub (Nov 22, 2020): @JoniVR my setup is ``` MBP 16" --TB3--> Caldigit USB-C Pro Dock --DP--> Dell U2713HM --DP--> LG 27UL650 ``` You're right, this is not using eGPU. MBP has AMD Radeon Pro 5500M 4 GB

gitea-mirror commented

2026-05-05 05:29:26 -06:00

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@waydabber commented on GitHub (Aug 21, 2021):

Hi, can you please try 3.0.0 if anything is changed? Probably not, but to be sure that this issue is still relevant. Also please try ddctl if it works and also show us a screenshot of the Displays page of the 3.0.0 version to see what MC makes of your setup. Thank you!

@waydabber commented on GitHub (Aug 21, 2021): Hi, can you please try 3.0.0 if anything is changed? Probably not, but to be sure that this issue is still relevant. Also please try [ddctl if it works](https://github.com/MonitorControl/MonitorControl/wiki/Monitor-Troubleshooting) and also show us a screenshot of the Displays page of the 3.0.0 version to see what MC makes of your setup. Thank you!

gitea-mirror commented

2026-05-05 05:29:28 -06:00

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@waydabber commented on GitHub (Aug 25, 2021):

I'll close this issue for now but please feel free to comment if there is anything we can do. If the issue persists, we can reopen this issue! Thank you!

@waydabber commented on GitHub (Aug 25, 2021): I'll close this issue for now but please feel free to comment if there is anything we can do. If the issue persists, we can reopen this issue! Thank you!

gitea-mirror referenced this issue

2026-05-05 07:03:57 -06:00

[PR #239] [MERGED] Add issue templates #1072