Clicking Display Settings "USE HDR" kills 4K HDR LG C1 TV screen


Swampthing

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I posted this question on Tom's Hardware, but it was suggested this forum might be helpful as I have a new problem with Windows 11. When I plug in my HDMI connection into the Strix SCAR 17 SE for my LG C1 tv, it sees the tv as a second display. I use WINDOWS +P to black out the laptop screen and use the tv at full resolution. It shows up at 3840x2160@60Hz. However if I go into Display Settings and try to set the tv to USE HDR, the tv screen wavers then disconnects and stops being recognized as a second display. And it reverts to my laptop monitor. I can't turn USE HDR off, because it says display not active... I have an XSX and PS5, as well as a 4K apple tv, and they all run fine in 4K HDR on this tv. I use Zeskit 8K HDMI cables for all the connections. The only way for me to recover the tv as a second screen is to reinstall Windows 11 and go from there... but don't click USE HDR.

As background, I was using my Asus G733QSA ROG Strix 17 without any of these connection problems at all. And I set the SECOND SCREEN to the 3840 tv resolution and HDR. Same cable. Same tv. No problems.

But I recently upgraded to the new Asus ROG STRIX SCAR 17 SE with Windows 11. The new laptop has a 2560x1440 resolution at 60/240Hz. The old laptop had a resolution of 1080p at 60Hz. My LG C1 operates at 3840 resolution of 60/120Hz with full 4K and HDR. When it's functioning as the non-HDR 4K second screen, it is broadcasting at 60Hz. The G733SQA operates at a 1080p resolution and 60Hz.

There isn't anything wrong with the HDMI port, as everything works fine initially because it will allow 4K to be broadcast, just not in HDR. However, I would love to use the HDR just like I did with my previous ROG Strix 17. The new laptop meets HDMI 2.1 spec.

Any suggestions? I am at a loss how to fix this problem. Tried reinstalling Windows 11, uninstalling graphics drivers, check for Windows Updates, unplugging/replugging HDMI at different points, etc. Nothing seems to work. But if I take the HDMI cable out and plug it into the old laptop... everything is normal. The old laptop sees the tv as a second screen and outputs 4K HDR.
 
Windows Build/Version
Windows 11 Pro 64-bit (10.0, Build 22000) (22000.co_release.210604-1628)

My Computer

System One

  • OS
    Windows 11
    Computer type
    Laptop
    Manufacturer/Model
    Asus ROG Strix SCAR 17 SE
    CPU
    intel i9-12950HX
    Memory
    32 GB
    Graphics Card(s)
    3080 Ti
    Screen Resolution
    Laptop: 2560x1440, 4K UHD LG C1: 2840x2160
    Hard Drives
    2 TB raid
    Mouse
    Razer Deathadder Pro v2
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DigitalGoat

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Might be way off the mark here but, does the old laptop include a MUX switch and the new one doesn't?
 

My Computer

System One

  • OS
    Windows 11 Pro
    Computer type
    PC/Desktop
    Manufacturer/Model
    Scan 3XS Custom 1700
    CPU
    Intel i7-12700K 3.6GHz Base (5.0GHz Turbo)
    Motherboard
    Asus ProArt Creator B660 D4
    Memory
    64GB DDR 3600Mhz
    Graphics Card(s)
    Asus Tuff RTX 3080 10GB OC
    Sound Card
    Onboard Realtek
    Monitor(s) Displays
    Gigabyte G32QC 32inch 16:9 curved @2560 x 1440p 165Hz Freesync Premium Pro/ Dell SE2422H 24inch 16:9 1920 x 1080p 75Hz Freesync
    Screen Resolution
    2560 x 1440p & 1920 x 1080p
    Hard Drives
    WD SN570 1TB NVME (Boot), Samsung 870QVO 1TB (SSD), SanDisk 3D Ultra 500Gb (SSD) x2, Seagate 3Tb Expansion Desk (Ext HDD), 2x Toshiba 1Tb P300 (Ext HDD)
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Swampthing

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Well, exactly the opposite. My old laptop didn't have a MUX switch, but the new one does. Can a MUX switch cause HDR output issues?
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    Laptop
    Manufacturer/Model
    Asus ROG Strix SCAR 17 SE
    CPU
    intel i9-12950HX
    Memory
    32 GB
    Graphics Card(s)
    3080 Ti
    Screen Resolution
    Laptop: 2560x1440, 4K UHD LG C1: 2840x2160
    Hard Drives
    2 TB raid
    Mouse
    Razer Deathadder Pro v2
    Internet Speed
    FiOS GIG
    Browser
    Microsoft Edge

DigitalGoat

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Well the purpose of a MUX is to allow a dedicated GPU in a laptop to bypass any splitting hardware and output directly to a display device, so no power sharing or balancing etc. I would have thought a MUX would work without issues, whereas a laptop without one might have issues, which is the opposite of what you are experiencing so... :unsure:
I must admit not knowing much on the subject as I don't use performance laptops, just heard reviewers extoling the virtues of an included MUX.
Whether it is the cause of your problems remains to be determined though, might be a red herring, maybe the port on the laptop is lacking in some way? Is there any info you could gather from the manufacturer or their user forums, if they have them?
 

My Computer

System One

  • OS
    Windows 11 Pro
    Computer type
    PC/Desktop
    Manufacturer/Model
    Scan 3XS Custom 1700
    CPU
    Intel i7-12700K 3.6GHz Base (5.0GHz Turbo)
    Motherboard
    Asus ProArt Creator B660 D4
    Memory
    64GB DDR 3600Mhz
    Graphics Card(s)
    Asus Tuff RTX 3080 10GB OC
    Sound Card
    Onboard Realtek
    Monitor(s) Displays
    Gigabyte G32QC 32inch 16:9 curved @2560 x 1440p 165Hz Freesync Premium Pro/ Dell SE2422H 24inch 16:9 1920 x 1080p 75Hz Freesync
    Screen Resolution
    2560 x 1440p & 1920 x 1080p
    Hard Drives
    WD SN570 1TB NVME (Boot), Samsung 870QVO 1TB (SSD), SanDisk 3D Ultra 500Gb (SSD) x2, Seagate 3Tb Expansion Desk (Ext HDD), 2x Toshiba 1Tb P300 (Ext HDD)
    PSU
    Corsair RM1000X Modular
    Case
    Corsair 4000D Airflow Desktop
    Cooling
    Corsair Hydro H150i RGB Pro XT 360mm Liquid Cooler, 3 x 120mm fans, 1x Exhaust
    Keyboard
    Microsoft Ergonomic
    Mouse
    Logitech G402
    Internet Speed
    800Mbs
    Browser
    Edge Chromium
    Antivirus
    Defender, Malwarebytes

johnlgalt

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Which input are you using on the C1? I have the 55" myself, though it is in another room - but ISTR Vincent of HDTVTest saying something specific needed to be done with newer GPU-based machines. His channel is on YT, I'll try to take a look, but have a look yourself, maybe you'll find it faster than I.
 

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System One System Two

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    Windows 11 21H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    HomeBrew
    CPU
    AMD Ryzen 9 3950X
    Motherboard
    MSI MEG X570 GODLIKE
    Memory
    4 * Corsair Vengeance 32 GB 3600 MHz
    Graphics Card(s)
    EVGA GeForce RTX 3080 Ti XC3 ULTRA GAMING (12G-P5-3955-KR)
    Sound Card
    Realtek® ALC1220 Codec
    Monitor(s) Displays
    Eve Spectrum ES07D02 280 Hz QHD | Eve Spectrum ES07D03 4K Gaming Monitor
    Screen Resolution
    1440p | 4k
    Hard Drives
    3x Samsung 980 Pro NVMe PCIe 4 M.2 2 TB SSD (MZ-V8P2T0B/AM)
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    Case
    Fractal Design Define 7 XL Dark ATX Full Tower Case
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    ZXT KRAKEN Z73 73.11 CFM Liquid CPU Cooler (3x 120 mm push top) + Air 3x 140mm case fans (pull front) + 1x 120 mm (push back) and 1 x 120 mm (pull bottom)
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    Windows 10 x64 Pro build 21H1
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    Manufacturer/Model
    Dell Latitude E5470
    CPU
    Intel(R) Core(TM) i5-6300U CPU @ 2.40GHz, 2501 Mhz, 2 Core(s), 4 Logical Processor(s)
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    Dell
    Memory
    16 GB
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    Intel(R) HD Graphics 520
    Sound Card
    Intel(R) HD Graphics 520 + RealTek Audio
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    Dell laptop display 15"
    Screen Resolution
    1920 * 1080
    Hard Drives
    Toshiba 128GB M.2 22300 drive
    INTEL Cherryvill 520 Series SSDSC2CW180A 180 GB SATA III SSD
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    Dell
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    Dell
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    Dell
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Swampthing

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Thread Starter
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4
OS
Windows 11
AHA... I finally found the solution. It was a combination of things, and now I outputting 4K HDR at 120Hz! Here's how I did it:
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    Laptop
    Manufacturer/Model
    Asus ROG Strix SCAR 17 SE
    CPU
    intel i9-12950HX
    Memory
    32 GB
    Graphics Card(s)
    3080 Ti
    Screen Resolution
    Laptop: 2560x1440, 4K UHD LG C1: 2840x2160
    Hard Drives
    2 TB raid
    Mouse
    Razer Deathadder Pro v2
    Internet Speed
    FiOS GIG
    Browser
    Microsoft Edge
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