When I was running the live Linuxmint USB both monitors were working ok.
Upon install, only one monitor is being recognised by LM (the one connected to the vga port on my motherboard). My best monitor is connected to an installed graphics card and that is not being seen and/or activated by LinuxMint.
I have done all the updates via the Update Manager. I have also gone into Driver Manager and selected the driver LM recommends which is nvidia-driver-435 (recommended).
I've rebooted etc but only one screen is still being used, and even that screen is said by Linuxmint to be unknown vga.
In case it helps, here is the Terminal output from the command: inxi -SMCGx
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colin@colin-asus2:~$ inxi -SMCGx System: Host: colin-asus2 Kernel: 4.15.0-70-generic x86_64 bits: 64 compiler: gcc v: 7.4.0 Desktop: Cinnamon 4.2.4 Distro: Linux Mint 19.2 Tina base: Ubuntu 18.04 bionic Machine: Type: Desktop Mobo: ASUSTeK model: M5A78L-M/USB3 v: Rev X.0x serial: <root required> BIOS: American Megatrends v: 1503 date: 11/14/2012 CPU: Topology: 6-Core model: AMD FX-6300 bits: 64 type: MCP arch: Bulldozer L2 cache: 2048 KiB flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 42188 Speed: 1406 MHz min/max: 1400/3500 MHz Core speeds (MHz): 1: 1696 2: 1720 3: 1405 4: 1406 5: 1406 6: 1406 Graphics: Device-1: AMD RS780L [Radeon 3000] vendor: ASUSTeK driver: radeon v: kernel bus ID: 01:05.0 Device-2: NVIDIA GP107 [GeForce GTX 1050 Ti] vendor: Gigabyte driver: nvidia v: 435.21 bus ID: 02:00.0 Display: x11 server: X.Org 1.19.6 driver: ati,modesetting,nouveau,nvidia,radeon unloaded: fbdev,vesa resolution: 1024x768~60Hz OpenGL: renderer: AMD RS780 (DRM 2.50.0 / 4.15.0-70-generic LLVM 8.0.0) v: 3.3 Mesa 19.0.8 direct render: Yes colin@colin-asus2:~$
Can anyone tell me why only one monitor is working and how to fix it?
In the minutes after posting this I went back into the Driver Manager and selected a different driver:
xserver-xorg-video-nouveau (open-source) to test this one out and it asked me to reboot so I did.
When I rebooted it made no difference. Only the monitor connected to the vga was recognised.
So I went back into the driver manager screen again with a view to changing it back to the recommended driver and this time I was unable to select any of the circular check boxes and at the bottom of the screen is said "Continue using a manually installed driver" and this is what is selected and it won't let me select anything else!!!
It doesn't solve the problem of only seeing one monitor, but I was able to reselect the recommended driver (nvidia-driver-435 (recommended) by removing the drivers I had installed by using the Synaptic Package Manager and then letting the Driver Manger update its cache again.
But I still can only see and use one of my monitors. LM isn't even seeing that the second one exists in the Display modification screen, even when I click on the Detect Displays button.