A Screen for Every Vision: How LG’s UltraGear Won Over Today’s Most Demanding Users
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By R3V_Mario
After spending two days troubleshooting NVIDIA Surround, I finally isolated the root cause. Hopefully this saves someone else a lot of time.
Hardware
• MSI RTX 4080 Ventus 3X OC
• Windows 11
• 2x LG UltraGear 27GX790A-B (2560x1440 OLED 480 Hz)
• Certified DisplayPort 1.4 cables (Cable Matters VESA Certified)
• NVIDIA drivers tested:
- 576.52
- 610.62
- 610.74
Symptoms
NVIDIA Surround would either:
• Display "Display connection error"
or
• Both monitors would lose signal immediately after enabling Surround.
Things that DID NOT fix it
• Clean driver installation using DDU
• Older drivers
• Latest drivers
• Different DisplayPort ports
• HDMI
• Lowering resolution to 1920x1080
• Lowering refresh rate to 60 Hz
• Lowering color depth to 8-bit
• Disabling HDR
• Disabling G-SYNC
• Adaptive Sync OFF
• Adaptive Sync BASIC
• Adaptive Sync EXTENDED
Root Cause
The culprit was the monitor's DisplayPort Compatibility Version.
LG OSD
General
→ Input Compatibility Version
Default:
DisplayPort 1.4
This causes NVIDIA Surround to fail.
Changing BOTH monitors to:
DisplayPort 1.2
Immediately fixes the issue.
After switching to DP 1.2:
• NVIDIA Surround works normally.
• Available refresh rates become:
- 60 Hz
- 120 Hz
- 144 Hz
• 5120×1440 Surround enables successfully.
Returning the monitors to DP 1.4 immediately reproduces the failure.
This behavior is identical on NVIDIA drivers 576.52 and 610.74.
Conclusion
This appears to be a compatibility issue between NVIDIA Surround and the LG 27GX790A-B when operating in DisplayPort 1.4 mode (possibly related to DSC and/or the monitor advertising 480 Hz capability).
For anyone wanting to use NVIDIA Surround on these monitors:
Set BOTH monitors to:
General
→ Input Compatibility Version
→ DisplayPort 1.2
Then enable Surround.
Hopefully NVIDIA and LG can investigate.
Additional note:
Games with native multi-monitor support should NOT use NVIDIA Surround.
Example:
DARIUSBURST Chronicle Saviours includes a native Dual Screen launcher and performs better using its built-in dual-screen mode than using NVIDIA Surround.
My use case is Rocket League local split-screen.
NVIDIA Surround allows each player to occupy a full 2560×1440 monitor instead of sharing a single monitor split down the middle.
This workaround makes that possible.
Test Matrix
| Test | Result |
| -------------------------------- | --------------------- |
| Driver 576.52 | ❌ DP 1.4 / ✅ DP 1.2|
| Driver 610.74 | ❌ DP 1.4 / ✅ DP 1.2|
| HDR Off | No change |
| G-SYNC Off | No change |
| Adaptive Sync Off/Basic/Extended | No change (in DP 1.2) |
| HDMI | No change |
| 1080p 60 Hz | No change |
| **DP 1.2 Compatibility Mode** | **Fixes the issue** |
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By stevef
Since my lg-oled65c9pla auto-updated to WebOS 5.5, there is a new bug.
The TV is connected to my Cambridge Audio Evo 75 amplifier over ARC - on powering the TV, it has always started up the amp, and switched it to use audio, instead of the appalling TV speakers. The whole setup has worked flawlessly for 5 years, but since WebOS 5.5, the amplifier starts, but is left in a muted state, and using the un-mute or volume controls on the TV remote makes no difference to turning on audio. The only way to get audio to play though my amp a speakers is to turn the amp's volume dial or press a volume button on the a amp's remote - this then unmutes the TV and audio is back.
There is no setting I can find in the TV that relates to whether the ARC channel starts muted or not...
No software has changed in my amp. This is an annoying new bug in the TV software, I assume down to some CEC changes.
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By chris7ben
The sound and picture are out of sync when screen mirroring from my iPhone 16 Pro to my LGQNED70A6A TV, using the internal speaker. I have tried all the recommended tips in the settings to cure the issue with no success. However, when I isolate the TV from the mains supply for 60 seconds and restart it, the syncing issue is cured but degrades after a day or so. My iPhone software is up to date and there is no firmware upgrade available for the TV. My LinkSys router has a full fibre connection. The only connection into the TV is the mains supply. Any help much appreciated. Thanks in advance.
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By Charley
On my LG 'smart' TV now for some reason I can now only watch the LG channels but not the fiber-optic programming on wi-fi . The HDMI 1 feed I normally use shows 'dark' on the Dashboard even though I can get the green checkmark on it. How do I reconnect it? The Dashboard shows my feed as ethernet/cable; which is wrong but efforts to correct it have failed so far.
Chemicals Industry -
By Mimiu
As the title says, please fix ASAP playback of Profile 7 (FEL/MEL) inside Matroska (.mkv) container.
On WEB OS 24 it was working with backwards compatibility to HDR10 base layer - in other words the Dolby Vision was omitted.
Currently in WEBOS 25 the files won't work/play.
As LG started to support Profile 8 Dolby Vision from WEB OS 25 in MKV properly, this should be easy fix for LG.
Example of MediaInfo of Profile 7:
Video ID : 1 Format : HEVC Format/Info : High Efficiency Video Coding Format profile : Main [email protected]@High HDR format : Dolby Vision, Version 1.0, Profile 7.6, dvhe.07.06, BL+EL+RPU, no metadata compression, Blu-ray compatible / SMPTE ST 2086, Version HDR10, HDR10 compatible Codec ID : V_MPEGH/ISO/HEVC Duration : 1 h 25 min Bit rate : 55.3 Mb/s Width : 3 840 pixels Height : 2 160 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 23.976 (24000/1001) FPS Color space : YUV Chroma subsampling : 4:2:0 (Type 2) Bit depth : 10 bits Bits/(Pixel*Frame) : 0.278 Stream size : 32.9 GiB (91%) Language : English Default : Yes Forced : No Color range : Limited Color primaries : BT.2020 Transfer characteristics : PQ Matrix coefficients : BT.2020 non-constant Mastering display color primaries : BT.2020 Mastering display luminance : min: 0.0001 cd/m2, max: 1000 cd/m2 Maximum Content Light Level : 966 cd/m2 Maximum Frame-Average Light Level : 223 cd/m2 Cheers and thank you.
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