Second display is not recognized (AMD GPU)

Hello!! I´m new around here. I just installed Manjaro in a dual boot. The problem I have is that the second monitor is not recognized, it show the grub as the one that manjaro works but once the login screen is up the monitor goes without signal, same happened when I installed ubuntu previous to Manjaro, but with windows works fine.
Im thinking, from my ignorance, that the problem is related to the kernel since I think is the common between ubuntu and manjaro but not windows.

Im using KDE Plasma, my GPU is AMD Rx480.

I don´t know what exactly outputs do you need but readings some similar topics I think these would be useful.

I´ve been trying the solution to similars problems that I found in this forum but nothing seems to work.
Thanks a lot for reading, and helping me!

xrandr -q

zsh: correct 'xrandr' to '_xrandr' [nyae]? n
Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 16384 x 16384
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 connected primary 1280x1024+0+0 (normal left inverted right x axis y axis) 338mm x 270mm
   1280x1024     60.02*+  75.02  
   1920x1080     60.00    59.94  
   1280x800      60.02  
   1152x864      75.00  
   1280x720      60.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
HDMI-A-1 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)

xrandr --listprovider

Providers: number : 1
Provider 0: id: 0x59 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 6 outputs: 5 associated providers: 0 name:AMD Radeon RX 480 Graphics @ pci:0000:01:00.0
    ~                                                                

sudo mhwd

> 0000:01:00.0 (0300:1002:67df) Display controller ATI Technologies Inc:
--------------------------------------------------------------------------------
                  NAME               VERSION          FREEDRIVER           TYPE
--------------------------------------------------------------------------------
           video-linux            2018.05.04                true            PCI
     video-modesetting            2020.01.13                true            PCI
            video-vesa            2017.03.12                true            PCI


> 0000:06:00.0 (0200:10ec:8168) Network controller Realtek Semiconductor Co., Ltd.:
--------------------------------------------------------------------------------
                  NAME               VERSION          FREEDRIVER           TYPE
--------------------------------------------------------------------------------
         network-r8168            2023.09.12                true            PCI


inxi -Fxxz

System:
  Kernel: 6.5.5-1-MANJARO arch: x86_64 bits: 64 compiler: gcc v: 13.2.1
    Desktop: KDE Plasma v: 5.27.8 tk: Qt v: 5.15.11 wm: kwin_x11 dm: SDDM
    Distro: Manjaro Linux base: Arch Linux
Machine:
  Type: Desktop Mobo: MSI model: H170A PC MATE (MS-7971) v: 2.0
    serial: <superuser required> UEFI-[Legacy]: American Megatrends v: B.70
    date: 05/23/2016
CPU:
  Info: quad core model: Intel Core i5-6400 bits: 64 type: MCP arch: Skylake-S
    rev: 3 cache: L1: 256 KiB L2: 1024 KiB L3: 6 MiB
  Speed (MHz): avg: 800 min/max: 800/3300 cores: 1: 800 2: 800 3: 800 4: 800
    bogomips: 21607
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
  Device-1: AMD Ellesmere [Radeon RX 470/480/570/570X/580/580X/590]
    vendor: PC Partner / Sapphire driver: amdgpu v: kernel arch: GCN-4 pcie:
    speed: 8 GT/s lanes: 16 ports: active: HDMI-A-1 empty: DP-1, DP-2,
    DVI-D-1, HDMI-A-2 bus-ID: 01:00.0 chip-ID: 1002:67df temp: 51.0 C
  Display: x11 server: X.Org v: 21.1.8 compositor: kwin_x11 driver: X:
    loaded: amdgpu unloaded: modesetting alternate: fbdev,vesa dri: radeonsi
    gpu: amdgpu display-ID: :0 screens: 1
  Screen-1: 0 s-res: 1280x1024 s-dpi: 96
  Monitor-1: HDMI-A-1 mapped: HDMI-A-0 model: Dell E176FP res: 1280x1024
    dpi: 96 diag: 433mm (17")
  API: EGL v: 1.5 platforms: device: 0 drv: radeonsi device: 1 drv: swrast
    surfaceless: drv: radeonsi x11: drv: radeonsi inactive: gbm,wayland
  API: OpenGL v: 4.6 compat-v: 4.5 vendor: amd mesa v: 23.1.9-manjaro1.1
    glx-v: 1.4 direct-render: yes renderer: AMD Radeon RX 480 Graphics
    (polaris10 LLVM 16.0.6 DRM 3.54 6.5.5-1-MANJARO) device-ID: 1002:67df
  API: Vulkan v: 1.3.264 surfaces: xcb,xlib device: 0 type: discrete-gpu
    driver: mesa radv device-ID: 1002:67df
Audio:
  Device-1: Intel 100 Series/C230 Series Family HD Audio
    vendor: Micro-Star MSI driver: snd_hda_intel v: kernel bus-ID: 00:1f.3
    chip-ID: 8086:a170
  Device-2: AMD Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590]
    vendor: PC Partner / Sapphire driver: snd_hda_intel v: kernel pcie:
    speed: 8 GT/s lanes: 16 bus-ID: 01:00.1 chip-ID: 1002:aaf0
  Device-3: BEHRINGER GmbH UMC204HD 192k driver: snd-usb-audio type: USB
    rev: 2.0 speed: 480 Mb/s lanes: 1 bus-ID: 1-12:4 chip-ID: 1397:0508
  API: ALSA v: k6.5.5-1-MANJARO status: kernel-api with: aoss
    type: oss-emulator
  Server-1: JACK v: 1.9.22 status: off
  Server-2: PipeWire v: 0.3.81 status: off with: pipewire-media-session
    status: active
  Server-3: PulseAudio v: 16.1 status: active with: pulseaudio-alsa
    type: plugin
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
    vendor: Micro-Star MSI driver: r8169 v: kernel pcie: speed: 2.5 GT/s
    lanes: 1 port: d000 bus-ID: 06:00.0 chip-ID: 10ec:8168
  IF: enp6s0 state: up speed: 100 Mbps duplex: full mac: <filter>
Drives:
  Local Storage: total: 1.58 TiB used: 9.28 GiB (0.6%)
  ID-1: /dev/nvme0n1 vendor: KIOXIA model: EXCERIA G2 SSD size: 931.51 GiB
    speed: 31.6 Gb/s lanes: 4 serial: <filter> temp: 43.9 C
  ID-2: /dev/sda vendor: Kingston model: SUV400S37240G size: 223.57 GiB
    speed: 6.0 Gb/s serial: <filter>
  ID-3: /dev/sdb vendor: Seagate model: ST3500418AS size: 465.76 GiB
    speed: 3.0 Gb/s serial: <filter>
Partition:
  ID-1: / size: 201.7 GiB used: 9.28 GiB (4.6%) fs: ext4 dev: /dev/sda1
Swap:
  ID-1: swap-1 type: partition size: 16.41 GiB used: 0 KiB (0.0%) priority: -2
    dev: /dev/sda2
Sensors:
  System Temperatures: cpu: 40.0 C pch: 44.5 C mobo: N/A gpu: amdgpu
    temp: 52.0 C
  Fan Speeds (rpm): N/A gpu: amdgpu fan: 2442
Info:
  Processes: 206 Uptime: 29m Memory: total: 32 GiB available: 31.31 GiB
  used: 2.77 GiB (8.9%) Init: systemd v: 254 default: graphical Compilers:
  gcc: 13.2.1 clang: 16.0.6 Packages: pm: pacman pkgs: 1146 Shell: Zsh v: 5.9
  running-in: konsole inxi: 3.3.30

How is the second monitor connected? Displayport cable to RX480?

Nope, is connected via HDMI as well as the first one

Your RX 480 has 1 HDMI and 3 Displayport outputs. The only other HDMI output is the one connected to your motherboard which is from the Intel integrated graphics.

I strongly suggest connecting both monitors to the RX 480, which will require a Displayport cable for one of them. Otherwise things will probably get complicated.

If that’s not possible or you don’t want to do that then I leave it to someone else to explain how to setup dual Intel+AMD graphics on separate monitors because I don’t know how.

Thank you for your comment but as I said I have both monitors connected to de gpu via HDMI

I suppose that port is the HDMI-A-1 shown in xrandr -q

HDMI-A-0 connected primary 1280x1024+0+0 (normal left inverted right x axis y axis) 338mm x 270mm
   1280x1024     60.02*+  75.02  
   1920x1080     60.00    59.94  
   1280x800      60.02  
   1152x864      75.00  
   1280x720      60.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
HDMI-A-1 disconnected (normal left inverted right x axis y axis)

As I said, thank you for your time.