Monitors connected with HDMI not detected by a NVIDIA GPU

kamahl · 2020-10-03 16:07:16

Hello,
I wanted to use two monitors on my desktop computer. I have this GPU:

01:00.0 VGA compatible controller: NVIDIA Corporation GP107 [GeForce GTX 1050 Ti] (rev a1)

It has a DVI output and two HDMI output which I wanted to use to connect my two monitors. However, for some reason only the DVI output seems to be working, so I am currently able to only use one monitor, connected via DVI. As a side note, I am using a HDMI to DisplayPort cable, as the monitors do not have HDMI input, only DisplayPort, but I believe it should not matter, right?

Anyway, when I plug the HDMI, the system completely ignores it and considers it disconnected, as evidenced by:

Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
DVI-D-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 477mm x 268mm
   1920x1080     60.00*+
   1680x1050     59.95  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1280x800      59.81  
   1280x720      60.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   640x480       75.00    59.94  
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)

The nvidia driver is being used

lspci -nnk | grep VGA -A3 | grep 'in use'
        Kernel driver in use: nvidia

I am using X11 + KDE/Plasma if that matters for anything.

I am completely clueless as of where to look for the cause of the problem, any ideas?

inb4, Yes, I have double checked the power is on, the monitor is on, and the cable is properly plugged on both sides.

seth · 2020-10-03 16:42:12

I am using a HDMI to DisplayPort cable, as the monitors do not have HDMI input, only DisplayPort, but I believe it should not matter, right?

Wrong.
#1: it's always the cable, which is extra true for the HDMI and it's wonky handshake protocol.

There're two HDMI/DP outputs (likely sharing the same jack) - is neither a DP (so you can just use the DP connection and skip HDMI)?
In any event, you should get the adapter out of the equation because it actually most likely is the weak link - do you eg. have a TV w/ a HDMI input?

kamahl · 2020-10-03 17:59:41

Solved. tl;dr: It was the cable.

Apparently the cable is somehow (would not have imagined that in 2020) one directional, and requires DP output from video card and HDMI on the monitor, and I was trying to do it the other way around.

seth · 2020-10-03 20:16:28

Ain't the #1 reason for no reason, 'key? ;-)

Please always remember to mark resolved threads by editing your initial posts subject - so others will know that there's no task left, but maybe a solution to find.
Thanks.

Arch Linux

#1 2020-10-03 16:07:16

Monitors connected with HDMI not detected by a NVIDIA GPU

#2 2020-10-03 16:42:12

Re: Monitors connected with HDMI not detected by a NVIDIA GPU

#3 2020-10-03 17:59:41

Re: Monitors connected with HDMI not detected by a NVIDIA GPU

#4 2020-10-03 20:16:28

Re: Monitors connected with HDMI not detected by a NVIDIA GPU

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