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By Interstellarkev
This is for all that have LG monitors with the latest software that changed UI settings for GAME OPTIMIZER
I could not find this anywhere on the internet for an update on what happened to the compatibility modes for DisplayPort/HDMI. Everything is outdated.
Apparently LG updated their UI and MOVED the option for compatibility modes to disable DSC. This USED to be in the common GENERAL tab, but NO LG moved it to the External Devices, which makes no sense as it should be with the common general menu.
I'm not sure if this is a bug or an oversight, but here it is
SETTINGS BUTTON > GENERAL > EXTERNAL DEVICES > INPUT COMPATIBILITY
Why would you disable DSC, you ask?
Well, if you don't disable this mode, you will not be able to use scaling factors like DSR on NVIDIA. I have seen remarks about AMD being able to use it without this option turned off, but for NVIDIA they are behind on this.
This WILL disable high frame rates beyond 144 Hz for the trade-off, but you will be able to scale your resolution higher.
link hidden, please login to view
TESTED 1.4dsc off (full dsr support higher res)
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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 Ramesh Chand Vishwakarma
It is unprofessional on part of LG TV that they do not resolve the basic issue of adding app gCmob in their app store.
My 50UT80506LA LG WebOs TV does not support my office security camera system via wifi to TV. We need (gCmob app) in list of app.
I can't connect my office camera via Wi-Fi to LG-TV. No body in LG TV technical team is proactive in resolving the issue of customer. They are more happy to befool the customers, rather than looking for technical solution through wider thinking.
Please talk to you top management and make a visit to our office to understand the customers plight..
Please respond to customers needs.
Regards,
Ramesh Chand Vishwakarma
MD/CEO
DeGicon Pro Iternatiuonal Pvt. Ltd.
Noida, UP
+91 9910246766
Receipt of LG TV from Om Prakash Yadav.pdf
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By Raphael Armin
the update to webOS 26 broke the very valuable home assistant integration!
Please fix it asap - many users rely on it!
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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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