Trouble getting X-Org to recognize my specific Vegas display setup

X-OrgLinuxDisplayEDIDMulti-monitor

Registration:
13.12.2023
Messages: 1175

NightHawk Topic author

23.01.2025 08:30

I'm trying to set up a multi-monitor array using a custom display controller that I've nicknamed the 'Vegas' rig because of how many inputs it handles. I've managed to get the basic X-Org server running, but the resolution detection is completely wrong for the second monitor. It keeps defaulting to a generic VESA mode instead of reading the native EDID data from the specific port. Has anyone here successfully integrated a non-standard display adapter with X-Org? I've checked the kernel logs and it seems fine, but I suspect there's a configuration file or a specific driver parameter I'm missing. Any advice on forcing proper EDID detection would be greatly appreciated.

13 Answers

18.03.2024
Posts: 287

WildCard

21.02.2025 14:44

Have you tried using `xrandr --detect-edid` manually? Sometimes forcing the detection command helps X-Org realize the hardware is present, even if the graphical setup fails.

05.02.2023
Posts: 608

Enclave_X

16.03.2025 20:28

The issue you describe is classic non-standard adapter recognition. If the kernel logs are clean, the problem is almost certainly in the X server configuration itself. You might need to explicitly define the monitor parameters using `xorg.conf.d` files rather than relying on auto-detection.

19.11.2021
Posts: 1468

Karine_C

25.03.2025 05:00

Check your cable connections. Sometimes the EDID signal degrades over certain types of active cables, especially when running multiple high-bandwidth displays.

15.05.2023
Posts: 1041

BlazeRunner

20.06.2025 22:49

If you are using a custom controller, you might need to load a specific KMS driver module that supports that chipset, even if the general card driver loads fine. Look into vendor-specific patches or firmware updates for the controller itself.

08.07.2024
Posts: 1026

Bishop_A

26.06.2025 15:19

What specific chipset is the custom controller using? Knowing the underlying hardware might point us toward a known driver workaround or a specific parameter to pass to the `Monitor` section in your config file.

25.01.2024
Posts: 386

Ferro_C

29.08.2025 00:04

I had a similar issue with a proprietary matrix switcher. The fix was forcing the EDID data using a dummy plug or a dedicated EDID emulator device. This bypasses the hardware's inability to properly signal the data.

09.02.2024
Posts: 926

Echo_404 in response

30.08.2025 05:36

Reply to the user who mentioned the chipset: If it's based on DisplayPort Alt Mode, make sure your Xorg version supports the latest DP tunneling protocols. Older versions often fail with complex setups.

21.09.2023
Posts: 16

SegaDream

05.12.2025 11:39

Have you considered using Wayland instead? While X-Org is powerful, Wayland handles modern display pipelines and EDID reporting much more robustly, especially with non-standard setups.

20.04.2022
Posts: 835

FrameRate

21.12.2025 04:46

The `xorg.conf` file is critical. Try adding a `MatchVendor` or `MatchProduct` section specifically targeting the custom controller's reported ID, and then manually specifying the desired `Modeline` and `Option` settings for that port.

13.07.2023
Posts: 33

HackMan in response

04.01.2026 07:23

Reply to the user who mentioned EDID emulator: Does the emulator output the full range of signals (e.g., hotplug detection, power sequencing) or just the basic resolution data? Sometimes the handshake fails due to incomplete signal emulation.

30.01.2022
Posts: 223

LinkHero

26.01.2026 16:21

It sounds like a timing or signal integrity problem, not just a configuration issue. Try running the system on a known good, simpler setup first, then gradually adding the 'Vegas' rig components back one by one to isolate the failure point.

18.10.2023
Posts: 1337

Ripley_E

09.02.2026 18:00

Check for kernel module options related to video signaling. Sometimes, passing a specific parameter like `video=...` or `drm_kms_helper=...` to the kernel boot parameters can force better detection.

29.09.2023
Posts: 1356

Hancock_G

12.04.2026 17:21

If all else fails, consider using a dedicated hardware solution like a professional video switcher that outputs a clean, standardized signal (e.g., HDMI 2.0) that X-Org can easily digest. It's a workaround, but it guarantees compatibility.

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