2nd monitor not detected.

[GoldBlend]

Hello, first time poster and first time downloading Linux. PSB specs.
My second monitor is not detected and I've tried various things through out these forums like changing lines GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to fit windows but it didn't change anything . Originally my resolution was condensed on my laptop screen but switching to native drivers and rebooting seemed to sort that issue. I downloaded the latest ISO off Mint website 20.3 Una cinnamon. Any help would be greatly appreciated.

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System:
  Kernel: 5.13.0-25-generic x86_64 bits: 64 compiler: N/A 
  Desktop: Cinnamon 5.2.7 wm: muffin 5.2.0 dm: LightDM 1.30.0 
  Distro: Linux Mint 20.3 Una base: Ubuntu 20.04 focal 
Machine:
  Type: Laptop System: ASUSTeK product: ASUS TUF Dash F15 FX516PM_FX516PM 
  v: 1.0 serial: <filter> 
  Mobo: ASUSTeK model: FX516PM v: 1.0 serial: <filter> 
  UEFI: American Megatrends LLC. v: FX516PM.321 date: 08/20/2021 
Battery:
  ID-1: BAT0 charge: 70.5 Wh condition: 70.5/76.0 Wh (93%) volts: 15.8/15.8 
  model: ASUSTeK ASUS Battery type: Li-ion serial: <filter> 
  status: Not charging cycles: 9 
  ID-2: hidpp_battery_0 charge: N/A condition: N/A volts: 4.1/N/A 
  model: Logitech G Pro Wireless Gaming Mouse type: N/A serial: <filter> 
  status: Charging 
  Device-1: hid-dc:2c:26:ff:99:c0-battery model: Keychron K2 serial: N/A 
  charge: N/A status: Discharging 
CPU:
  Topology: Quad Core model: 11th Gen Intel Core i7-11370H bits: 64 
  type: MT MCP arch: Tiger Lake rev: 1 L2 cache: 12.0 MiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 
  bogomips: 52838 
  Speed: 1571 MHz min/max: 400/4800 MHz Core speeds (MHz): 1: 848 2: 650 
  3: 1344 4: 2440 5: 1540 6: 1636 7: 3252 8: 2091 
Graphics:
  Device-1: Intel vendor: ASUSTeK driver: i915 v: kernel 
  bus ID: 0000:00:02.0 chip ID: 8086:9a49 
  Device-2: NVIDIA vendor: ASUSTeK driver: N/A bus ID: 0000:01:00.0 
  chip ID: 10de:2520 
  Display: x11 server: X.Org 1.20.13 driver: modesetting 
  unloaded: fbdev,vesa resolution: 1920x1080~144Hz 
  OpenGL: renderer: Mesa Intel Xe Graphics (TGL GT2) v: 4.6 Mesa 21.0.3 
  direct render: Yes 
Audio:
  Device-1: Intel vendor: ASUSTeK driver: snd_hda_intel v: kernel 
  bus ID: 0000:00:1f.3 chip ID: 8086:a0c8 
  Device-2: NVIDIA vendor: ASUSTeK driver: snd_hda_intel v: kernel 
  bus ID: 0000:01:00.1 chip ID: 10de:228e 
  Device-3: SteelSeries ApS type: USB 
  driver: hid-generic,snd-usb-audio,usbhid bus ID: 3-4.3:6 
  chip ID: 1038:1294 
  Sound Server: ALSA v: k5.13.0-25-generic 
Network:
  Device-1: Intel driver: iwlwifi v: kernel port: 5000 bus ID: 0000:00:14.3 
  chip ID: 8086:a0f0 
  IF: wlo1 state: down mac: <filter> 
  Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: ASUSTeK driver: r8169 v: kernel port: 3000 bus ID: 0000:2e:00.0 
  chip ID: 10ec:8168 
  IF: eno2 state: up speed: 1000 Mbps duplex: full mac: <filter> 
Drives:
  Local Storage: total: 476.94 GiB used: 10.67 GiB (2.2%) 
  ID-1: /dev/nvme0n1 vendor: SK Hynix model: HFM512GD3JX013N 
  size: 476.94 GiB speed: 31.6 Gb/s lanes: 4 serial: <filter> rev: 41000C20 
  scheme: GPT 
RAID:
  Hardware-1: Intel Volume Management Device NVMe RAID Controller 
  driver: vmd v: 0.6 port: 5000 bus ID: 0000:00:0e.0 chip ID: 8086.9a0b 
  rev: N/A 
Partition:
  ID-1: / size: 19.52 GiB used: 10.06 GiB (51.5%) fs: ext4 
  dev: /dev/nvme0n1p6 
  ID-2: /home size: 24.63 GiB used: 291.2 MiB (1.2%) fs: ext4 
  dev: /dev/nvme0n1p8 
  ID-3: swap-1 size: 3.72 GiB used: 0 KiB (0.0%) fs: swap 
  dev: /dev/nvme0n1p7 
Sensors:
  System Temperatures: cpu: 47.0 C mobo: N/A 
  Fan Speeds (RPM): cpu: 2200 
Repos:
  No active apt repos in: /etc/apt/sources.list 
  Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list 
  1: deb http://packages.linuxmint.com una main upstream import backport #id:linuxmint_main
  2: deb http://archive.ubuntu.com/ubuntu focal main restricted universe multiverse
  3: deb http://archive.ubuntu.com/ubuntu focal-updates main restricted universe multiverse
  4: deb http://archive.ubuntu.com/ubuntu focal-backports main restricted universe multiverse
  5: deb http://security.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
  6: deb http://archive.canonical.com/ubuntu/ focal partner
Info:
  Processes: 268 Uptime: 7m Memory: 15.31 GiB used: 1.29 GiB (8.4%) 
  Init: systemd v: 245 runlevel: 5 Compilers: gcc: 9.3.0 alt: 9 Shell: bash 
  v: 5.0.17 running in: gnome-terminal inxi: 3.0.38

[SMG]

My second monitor is not detected and I've tried various things through out these forums like changing lines GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to fit windows but it didn't change anything .

Welcome to the forum, GoldBlend.

Your computer has dual graphics. Many computers that have dual graphics require the Nvidia driver to be installed and loaded before external monitors will work. Currently, your computer is only set up to run the Intel graphics (which run your laptop screen). The Intel graphics are in the kernel, but because your computer is so new, you needed to install the newer kernel to get the proper graphics driver.

Have you opened Driver Manager and installed the recommended Nvidia driver?

If you have done that and rebooted your computer, please look for the nvidia-prime-applet icon in the lower right of your computer screen. I expect it looks like an Intel icon. You will want to use that applet to change to On-Demand mode and then reboot your computer for the change to take effect.

The Nvidia drivers will not load if you have Secure Boot enabled unless you create keys for them. I do not recall exactly how ASUS handles the keys, but if you are prompted to create keys, the Nvidia driver is why you would need to create them.

Let us know if you have any questions or run into issues.