Advice: See how many displays your CPU supports.
lscpu | grep -i 'model name:'
# output for me:
Model name: Intel(R) Pentium(R) CPU B960 @ 2.20GHz
Take the second part of output, and paste it in a search engine, like:
Intel(R) Pentium(R) CPU B960 @ 2.20GHz site:ark.intel.com
At ark.intel.com search the page for (Ctrl + F usually)
# of Displays Supported line. My CPU supports maximum of 2.
If your’ve a discrete GPU, then maybe your’re need to search same info for it.
lspci | grep -i vga
# my output
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT 620M/625M/630M/720M] (rev a1)
Try search term like:
nvidia specs GF117M
My: “This device has no display connectivity, as it is not designed to have monitors connected to it.” – https://www.techpowerup.com/gpu-specs/geforce-710m.c2017
So, for example, i can only have 2 working displays with this laptop at a time.