Problem connecting two monitors

[JayM]

one monitor for each card

That never works. When a discrete video card is installed the onboard GPU is disabled. You need to connect both monitors to your Nvidia card. And also upgrade to AHS as Huckleberry Fin said in post #2.

[tomtom11]

I have a system with dual boot win 10 + MX Linux, in Win 10 both screens work fine with my setup, also I used to have Manjaro XFCE and both screens work fine,
therefore I think this is a problem with the OS and not a hardware issue,

[JayM]

Windows handles hardware very differently that Debian Linux. I can't say about Manjaro as I only use MX. I haven't even used Windows at all for 8 years either. All I can tell you is that I've tried to get both my onboard GPU and my PCI-E GPU working at the same time and failed, and everyone I've seen in the forum who's tried that has failed. A quick web search says it depends both on your motherboard and your integrated GPU. If you run

Code: Select all

lspci | grep 'VGA'

do both of your GPUs, Intel and Nvidia, show up? If you only see the Intel listed, go into your BIOS settings and experiment with your choices for video: I read where making the onboard GPU the default might allow them both to work at the same time.

Sources:
https://arstechnica.com/civis/viewtopic.php?t=122577
https://www.techrepublic.com/forums/dis ... ci-e-card/

[tomtom11]

I see only the Nvidia
01:00.0 VGA compatible controller: NVIDIA Corporation GP108 (rev a1)

[JayM]

Then either your BIOS settings or your motherboard are disabling the onboard GPU in favor of the PCI-E video card, as happens with most motherboards. You will have to connect both monitors to the Nvidia PCI-E GPU.

[tascoast]

My experience is that you must connect both monitors to the active graphics card, both to function or be detected, as different graphics devices do not work in parallel in Linux.
*In practice, this may require adapters etc. to accommodate connection to different displays, depending upon the ports available.

[tomtom11]

thanks, I'll try with manjaro to see what the output for lspci command,
also, I'll try to change the UEFI settings for Primary Graphics Adapter, and updates

[JayM]

Also run

Code: Select all

xrandr --listproviders

in Manjaro. I'm curious what the result will be.