[GH-ISSUE #313] Acer X34P name not detected, but it is visible using ddccdl #246

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opened 2026-05-05 05:30:10 -06:00 by gitea-mirror · 4 comments

gitea-mirror commented

2026-05-05 05:30:10 -06:00

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Originally created by @wojciechczyz on GitHub (Oct 23, 2020).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/313

Checklist

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

Describe the bug
I have external Acer X34P connected, MonitorControl displays name as Unknown. However using ddccdl I can see monitor name:
ddcctl -d 1
D: NSScreen #478260293 (3440x1440 0°) 109.00 DPI
I: found 1 external display
I: polling display 1's EDID
I: got edid.serial: #ASMUeGST5VPd
I: got edid.name: Acer X34 P

To Reproduce
Connect Acer X34P
Run Monitor Control. In menu, monitor name is Unknown. In Display preferences table, Name and Display Name are both Unknown

Expected behavior
X34P displayed in Menu and preferences window

Additional context
using ddccdl I can see monitor name:
ddcctl -d 1
D: NSScreen #478260293 (3440x1440 0°) 109.00 DPI
I: found 1 external display
I: polling display 1's EDID
I: got edid.serial: #ASMUeGST5VPd
I: got edid.name: Acer X34 P

Environment Information (please complete the following information):

macOS version: Mac OS Catalina 10.15.7
MonitorControl version: 2.1.0 721
Monitor(s): Acer X34P

Originally created by @wojciechczyz on GitHub (Oct 23, 2020). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/313 **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** I have external Acer X34P connected, MonitorControl displays name as Unknown. However using ddccdl I can see monitor name: ddcctl -d 1 D: NSScreen #478260293 (3440x1440 0°) 109.00 DPI I: found 1 external display I: polling display 1's EDID I: got edid.serial: #ASMUeGST5VPd I: got edid.name: Acer X34 P **To Reproduce** Connect Acer X34P Run Monitor Control. In menu, monitor name is Unknown. In Display preferences table, Name and Display Name are both Unknown **Expected behavior** X34P displayed in Menu and preferences window **Additional context** using ddccdl I can see monitor name: ddcctl -d 1 D: NSScreen #478260293 (3440x1440 0°) 109.00 DPI I: found 1 external display I: polling display 1's EDID I: got edid.serial: #ASMUeGST5VPd I: got edid.name: Acer X34 P **Environment Information (please complete the following information):** - macOS version: Mac OS Catalina 10.15.7 - MonitorControl version: 2.1.0 721 - Monitor(s): Acer X34P

gitea-mirror

2026-05-05 05:30:10 -06:00

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gitea-mirror commented

2026-05-05 05:30:16 -06:00

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

Hey, we tweaked the display detection logic a bit in 3.0.0. Can you please test the new version and confirm if the issue is still present or can be closed? Thank you!

@waydabber commented on GitHub (Aug 21, 2021): Hey, we tweaked the display detection logic a bit in 3.0.0. Can you please test the new version and confirm if the issue is still present or can be closed? Thank you!

gitea-mirror commented

2026-05-05 05:30:20 -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 commented

2026-05-05 05:30:22 -06:00

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@ellieplz commented on GitHub (Sep 9, 2022):

hello! sorry to reopen, but issue persists on Acer x34.

ddctl brings up:
D: CGDisplay 95277898-4B8B-4E72-AB59-326B415E514F dispID(#3) (3440x1440 0°) 109.00 DPI
I: found 1 external display

brightness works but only between 0 and 50%, anything above 50% is just set to max.

Volume does not work at all, up, down, mute, non responsive, mute DDC command or otherwise.

ofc latest app ver (4.1.0) and all

@ellieplz commented on GitHub (Sep 9, 2022): hello! sorry to reopen, but issue persists on Acer x34. ddctl brings up: D: CGDisplay 95277898-4B8B-4E72-AB59-326B415E514F dispID(#3) (3440x1440 0°) 109.00 DPI I: found 1 external display brightness works but only between 0 and 50%, anything above 50% is just set to max. Volume does not work at all, up, down, mute, non responsive, mute DDC command or otherwise. ofc latest app ver (4.1.0) and all

gitea-mirror commented

2026-05-05 05:30:24 -06:00

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@the0neyouseek commented on GitHub (Sep 14, 2022):

Hi @ellieplz , If you are using a mac m1/m2 please make sure tu use an usb-c cable and not an HDMI one as this may be the reason for your issue. The HDMI port on these models does not allow for ddc control (hardware). Your other option would be to uncheck the "use hardware ddc control" checkbox in MonitorControl preferences

@the0neyouseek commented on GitHub (Sep 14, 2022): Hi @ellieplz , If you are using a mac m1/m2 please make sure tu use an usb-c cable and not an HDMI one as this may be the reason for your issue. The HDMI port on these models does not allow for ddc control (hardware). Your other option would be to uncheck the "use hardware ddc control" checkbox in MonitorControl preferences