Fix your drivers nvidia. HDMI > 165 Mhz BROKEN!

Paul,

I am facing exact same issues, did you ever get this resolved.
i have a UA55F9000 and connect using the one connect box.
but the screen is not getting any signal.

markosm, which driver are you using? Drivers prior to 346.16 have a bug that allows them to try to set YUV 4:2:0 modes when they aren’t supported. The relevant changelog entry is this one:

Hi

I was facing the same issues as well.

hardware:
NVIDIA GPU GeForce GT 710 (GK208)

driver: modinfo nvidia
filename: /lib/modules/4.14.7-300.fc27.x86_64/extra/nvidia/nvidia.ko.xz
alias: char-major-195-*
version: 387.34
supported: external
license: NVIDIA
srcversion: EBF1F3E36DFB3BFB97BB385

Using HDMI port.
Cable is brand new, HDMI 2.0.

From Xorg.0.log

[ 10.444] (–) NVIDIA(0): Valid display device(s) on GPU-0 at PCI:1:0:0
[ 10.444] (–) NVIDIA(0): CRT-0
[ 10.444] (–) NVIDIA(0): DFP-0
[ 10.444] (–) NVIDIA(0): DFP-1 (boot)
[ 10.445] (II) NVIDIA(0): NVIDIA GPU GeForce GT 710 (GK208) at PCI:1:0:0 (GPU-0)
[ 10.445] (–) NVIDIA(0): Memory: 2097152 kBytes
[ 10.445] (–) NVIDIA(0): VideoBIOS: 80.28.a6.00.01
[ 10.445] (II) NVIDIA(0): Detected PCI Express Link width: 8X
[ 10.446] (–) NVIDIA(GPU-0): CRT-0: disconnected
[ 10.446] (–) NVIDIA(GPU-0): CRT-0: 400.0 MHz maximum pixel clock
[ 10.446] (–) NVIDIA(GPU-0):
[ 10.446] (–) NVIDIA(GPU-0): DFP-0: disconnected
[ 10.446] (–) NVIDIA(GPU-0): DFP-0: Internal TMDS
[ 10.446] (–) NVIDIA(GPU-0): DFP-0: 330.0 MHz maximum pixel clock
[ 10.446] (–) NVIDIA(GPU-0):
[ 10.446] (–) NVIDIA(GPU-0): DFP-1: connected
[ 10.446] (–) NVIDIA(GPU-0): DFP-1: Internal TMDS
[ 10.446] (–) NVIDIA(GPU-0): DFP-1: 165.0 MHz maximum pixel clock

Monitor: Dell U3818DW

I managed to get the 3840x1600 resolution but only at refresh rate 25Mhz, and that was by changing the pixelclock to 165.00 in ModeLine, i.e.:
### Modeline “3840x1600_60” 395.00 3840 3888 3920 4000 1600 1603 1613 1646 +hsync -vsync
Modeline “3840x1600_60” 165.00 3840 3888 3920 4000 1600 1603 1613 1646 +hsync -vsync

Below you’ll se my Monitor,Device and Screen sections from xorg.conf:
Section “Monitor”
Identifier “U3818DW”
ModelName “DELL U3818DW”
VendorName “DEL”
# Monitor Manufactured week 19 of 2017
# EDID version 1.3
# Digital Display
DisplaySize 880 370
Gamma 2.20
Option “DPMS” “true”
HorizSync 25-115
VertRefresh 24-85
# Maximum pixel clock is 400MHz
#Extension block found. Parsing…
### Modeline “3840x1600_60” 395.00 3840 3888 3920 4000 1600 1603 1613 1646 +hsync -vsync
Modeline “3840x1600_60” 165.00 3840 3888 3920 4000 1600 1603 1613 1646 +hsync -vsync
Modeline “2560x1600_60” 241.50 2560 2608 2640 2720 1440 1443 1448 1481 +hsync -vsync

    Option          "PreferredMode" "3840x1600_60"

EndSection

Section “Device”
Identifier “Device0”
Driver “nvidia”
BoardName “GeForce GT 710”
VendorName “NVIDIA Corporation”
Option “ExactModeTimingsDVI” “TRUE”
Option “NoBandWidthTest” “TRUE”
Option “UseEDID” “FALSE”
# Option “ModeValidation” “AllowNon60hzmodesDFPModes, NoEDIDDFPMaxSizeCheck, NoVertRefreshCheck, NoHorizSyncCheck, NoDFPNativeResolutionCheck, NoMaxSizeCheck, NoMaxPClkCheck, NoEDIDModes”
Option “ModeValidation” “DFP-1: AllowNon60hzmodesDFPModes, NoEDIDDFPMaxSizeCheck, NoVertRefreshCheck, NoHorizSyncCheck, NoMaxSizeCheck, NoMaxPClkCheck, NoEDIDModes”
EndSection

Section “Screen”
Identifier “Screen0”
Device “Device0”
Monitor “U3818DW”
DefaultDepth 24
Option “Stereo” “0”
Option “nvidiaXineramaInfoOrder” “DFP-1”
Option “metamodes” “3840x1600_60 +0+0”
Option “SLI” “Off”
Option “MultiGPU” “Off”
Option “BaseMosaic” “off”
SubSection “Display”
Depth 24
EndSubSection
EndSection

Why is the maximum pixel clock for DFP-1 only 165 ?

I don’t want run the monitor on 25Mhz, it hurts my eyes! Please advise.

LOL. I think you’re hitting the ‘bug and workaround doesn’t work due other bug’ situation. Last info was from sandipt here in the forum that they’re working ‘on low profile’ on it.
The working workaround for the workaround is to create your own EDID and load it for the connector.