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Alex-C2025
Novice
543 Views

Core i7 i8700K with HDMI and my PC monitor LG 31MU97Z-B is OK in 4096x2160 but not with the Display Port wire or Mini Display Port wire

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Motherboard: ASUS PRIME Z370-A

CPU: Intel Core i7-8700K

Ventirad: be quiet! Pure Rock Slim BK008

RAM: BALLISTIX SPORT GAMING MEMORY DDR4-2666 1.2 V (2 x 2 x 16GB)

PSU: CORSAIR HX1200i

Full tower case: CORSAIR GRAPHITE SERIES 780T

Four hard drives: 1TB hard drive for data and 3 x 4TB Western Digital Caviar Black hard drives in RAID 5 for backups

SAMSUNG 1TB NVMe SSD 960 EVO M.2: for OS and apps

4K PC monitor: LG 31MU97Z-B 31" (4096x2160)

OS: Windows 10 Pro 64 bits + WSL Debian

Electric inverter: EATON Ellipse Pro 1200 FR

 

I have called by phone LG which has returned me to ASUS or INTEL. I also plan to contact Microsoft.

My issue is that I cannot run my desktop by linking it with a Display Port wire or a Mini Display Port wire with the PC monitor mentioned in the subject.

When I start my computer in Display Port or Mini Display Port I well see the BIOS screen in 3840x2160 but afterwards when the operating system is booting, there is no more signal on screen although I have well installed the two drivers for the screen (HDMI and Display Port) for Windows.

Otherwise with the HDMI wire it works but the frequency of the screen is 30 Hz maximum in 3840x2160 or 24 Hz maximum in 4096x2160. With the Mini Display Port I should join a frequency of 60 Hz in 4096x2160.

When I link the screen both in HDMI in 2048x2160 and in Display Port or Mini Display Port in 2048x2160 with the motherboard it works. I can have a 4096x2160 resolution to 60 Hz. But there, they are two screens split on one! Windows recognizes two monitors: 1 and 2.

Could you help me to put my 4K PC monitor with my motherboard only in Display Port or Mini Display Port with a 4096x2160 resolution with a frequency of 60 Hz, please?

 

This question has also been asked to Microsoft to this URL: https://answers.microsoft.com/fr-fr/windows/forum/windows_10-hardware/windows-connecté-en-hdmi-à-mon...

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1 Solution
Alex-C2025
Novice
156 Views

Thank you LWAKSMAN for your answer.

I am using the mini DP cable received with my monitor. I do not have received any DP cable with the monitor only a mini DP cable.

I should have to disable the DisplayPort 1.2 choice on the OSD menu and enable the DisplayPort EQ choice on the OSD menu and now it works in 3840x2160 at 30 Hz for the maximum resolution. The screen colours are very beautiful.

2019-08-19 21_55_34-ENG_US.pdf - Adobe Acrobat Pro 2017.png

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3 Replies
LeonWaksman
Super User
156 Views
  1. You should use high quality video cable. Use the cable received with the monitor.
  2. You should enable DisplayPort 1.2. See page 30 in User manual http://gscs-b2c.lge.com/downloadFile?fileId=KROWM000617430.pdf

 

Leon

 

Alex-C2025
Novice
157 Views

Thank you LWAKSMAN for your answer.

I am using the mini DP cable received with my monitor. I do not have received any DP cable with the monitor only a mini DP cable.

I should have to disable the DisplayPort 1.2 choice on the OSD menu and enable the DisplayPort EQ choice on the OSD menu and now it works in 3840x2160 at 30 Hz for the maximum resolution. The screen colours are very beautiful.

2019-08-19 21_55_34-ENG_US.pdf - Adobe Acrobat Pro 2017.png

View solution in original post

LeonWaksman
Super User
156 Views

So, I'm glad that you finally read your monitor manual. However since your board supports DP 1.2, I think you should leave this future enabled.

 

Leon

 

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