Detect second monitor

[Osmario]

Hi

I installed a second monitor on linux 20.1 by connecting the two hdmi ports.
The second monitor only displays PC letters but is not detected in preferences/display
How can I fix this problem?

Thanks in advance.

Code: Select all

lma@lma:~$ inxi -F
System:
  Host: lma Kernel: 5.4.0-131-generic x86_64 bits: 64 
  Desktop: Cinnamon 4.8.6 Distro: Linux Mint 20.1 Ulyssa 
Machine:
  Type: Desktop System: Dell product: Inspiron 24-3459 v: X00 
  serial: <superuser/root required> 
  Mobo: Dell model: 0NNMR5 v: A01 serial: <superuser/root required> 
  UEFI: Dell v: 2.6.4 date: 09/30/2016 
CPU:
  Topology: Dual Core model: Intel Core i5-6200U bits: 64 type: MT MCP 
  L2 cache: 3072 KiB 
  Speed: 800 MHz min/max: 400/2800 MHz Core speeds (MHz): 1: 800 2: 800 
  3: 800 4: 800 
Graphics:
  Device-1: Intel Skylake GT2 [HD Graphics 520] driver: i915 v: kernel 
  Display: x11 server: X.Org 1.20.13 driver: modesetting 
  unloaded: fbdev,vesa resolution: 1920x1080~60Hz 
  OpenGL: renderer: Mesa Intel HD Graphics 520 (SKL GT2) v: 4.6 Mesa 21.2.6 
Audio:
  Device-1: Intel Sunrise Point-LP HD Audio driver: snd_hda_intel 
  Sound Server: ALSA v: k5.4.0-131-generic 
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  driver: r8169 
  IF: enp1s0 state: up speed: 1000 Mbps duplex: full mac: f4:8e:38:e1:db:2f 
  Device-2: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter 
  driver: ath9k 
  IF: wlp2s0 state: down mac: 68:14:01:fe:d4:bf 
  Device-3: Qualcomm Atheros type: USB driver: btusb 
Drives:
  Local Storage: total: 1.13 TiB used: 365.08 GiB (31.6%) 
  ID-1: /dev/sda vendor: SanDisk model: SSD PLUS 240 GB size: 223.58 GiB 
  ID-2: /dev/sdb type: USB vendor: Western Digital model: WD10 JPVX-75JC3T0 
  size: 931.51 GiB 
Partition:
  ID-1: / size: 218.52 GiB used: 110.29 GiB (50.5%) fs: ext4 dev: /dev/sda2 
Sensors:
  System Temperatures: cpu: 37.5 C mobo: 29.8 C 
  Fan Speeds (RPM): cpu: 3026 
Info:
  Processes: 254 Uptime: 18m Memory: 7.68 GiB used: 2.07 GiB (27.0%) 
  Shell: bash inxi: 3.0.38

[SMG]

I installed a second monitor on linux 20.1 by connecting the two hdmi ports.

Where are these two HDMI ports located? Does your desktop computer have two HDMI ports on it?

Please provide the output of xrandr and enclose the results in code tags as described in this topic How to use code display tags on forums.linuxmint.com.

[Osmario]

Code: Select all

lma@lma:~$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 527mm x 296mm
   1920x1080     60.00*+  59.97    59.96    59.93  
   1680x1050     59.95    59.88  
   1600x1024     60.17  
   1400x1050     59.98  
   1600x900      59.99    59.94    59.95    60.00    59.82  
   1280x1024     60.02  
   1440x900      59.89  
   1400x900      59.96    59.88  
   1280x960      60.00  
   1440x810      60.00    59.97  
   1368x768      59.88    59.85  
   1366x768      59.79  
   1360x768      59.80    59.96  
   1280x800      59.99    59.97    59.81    59.91  
   1152x864      60.00  
   1280x720      60.00    59.99    59.86    59.74  
   1024x768      60.04    60.00  
   960x720       60.00  
   928x696       60.05  
   896x672       60.01  
   1024x576      59.95    59.96    59.90    59.82  
   960x600       59.93    60.00  
   960x540       59.96    59.99    59.63    59.82  
   800x600       60.00    60.32    56.25  
   840x525       60.01    59.88  
   864x486       59.92    59.57  
   800x512       60.17  
   700x525       59.98  
   800x450       59.95    59.82  
   640x512       60.02  
   720x450       59.89  
   700x450       59.96    59.88  
   640x480       60.00    59.94  
   720x405       59.51    58.99  
   684x384       59.88    59.85  
   680x384       59.80    59.96  
   640x400       59.88    59.98  
   576x432       60.06  
   640x360       59.86    59.83    59.84    59.32  
   512x384       60.00  
   512x288       60.00    59.92  
   480x270       59.63    59.82  
   400x300       60.32    56.34  
   432x243       59.92    59.57  
   320x240       60.05  
   360x202       59.51    59.13  
   320x180       59.84    59.32  

Code: Select all

lma@lma:~$ lsblk -o NAME,LABEL,SIZE,FSUSED,FSTYPE,UUID,PARTUUID,MOUNTPOINT,PARTFLAGS
NAME   LABEL    SIZE FSUSED FSTYPE UUID                                 PARTUUID                             MOUNTPOINT            PARTFLAGS
sda           223,6G                                                                                                               
├─sda1          512M   5,2M vfat   7EC0-0390                            4fb3e921-27a0-451b-8f0b-98a040cf0899 /boot/efi             
└─sda2        223,1G 110,3G ext4   57d68bc5-c6e7-4d4f-911b-d9dc658a8421 415c62b0-8511-424b-8528-d34554cb4969 /                     
sdb           931,5G                                                                                                               
├─sdb1 MINT   622,3G 179,3G ntfs   3D2A11E158BF0A01                     a7c50a08-01                          /media/lma/MINT       
└─sdb2 BACKUP 309,3G  75,5G ext4   ae30a6b3-23a6-4d49-9860-d6410eaf957e a7c50a08-02                          /run/timeshift/backup 
sr0            1024M         

"Where are these two HDMI ports located? Does your desktop computer have two HDMI ports on it?"
My desktop computer has only one HDMI port on it.

[SMG]

My desktop computer has only one HDMI port on it.

The xrandr output is showing the screen on your all-in-one computer, but it is not showing any other ports.

I did a search and found this Inspiron 24-3459, dual monitor? which indicates:

The Inspiron 24 3459 doesn't have a video-OUT port which you need for a 2nd monitor. The HDMI port it has is only HDMI-IN which you'd use to connect a DVD player, xBox, etc to this PC.

So that would be why the monitor is not showing up.

That person does indicate a second monitor could be attached with a USB3 connection, but I don't see that possibility in the data you posted so I do not know if that would work.