Second HDMI monitor do not work with Linux Mint 20.3

[bifidus_activo]

Dear Mint users
I hope you can help me with my Mint 20.3 installation.
I installed the Linux Distro without any problem and using two monitors.
Then (for personal reason) I disconnect and reconnect the monitors (maybe in the other order) but the second monitor is not working anymore.
inxi -Fxz output is:

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~$ inxi -Fxz
System:    Kernel: 5.4.0-96-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: Gnome 3.36.9 
           Distro: Linux Mint 20.3 Una base: Ubuntu 20.04 focal 
Machine:   Type: Mini-pc System: HP product: HP Z2 Mini G4 Workstation v: N/A serial: <filter> 
           Mobo: HP model: 8458 v: KBC Version 07.D4.00 serial: <filter> UEFI: HP 
           v: Q50 Ver. 01.06.07 date: 05/07/2020 
CPU:       Topology: Quad Core model: Intel Core i3-8100 bits: 64 type: MCP arch: Kaby Lake 
           rev: B L2 cache: 6144 KiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 28800 
           Speed: 3600 MHz min/max: 800/3600 MHz Core speeds (MHz): 1: 3602 2: 3600 3: 3600 
           4: 3600 
Graphics:  Device-1: NVIDIA GP107GLM [Quadro P600 Mobile] vendor: Hewlett-Packard driver: N/A 
           bus ID: 01:00.0 
           Display: x11 server: X.Org 1.20.13 driver: fbdev,nouveau unloaded: modesetting,vesa 
           resolution: 1920x1200~77Hz 
           OpenGL: renderer: llvmpipe (LLVM 12.0.0 256 bits) v: 4.5 Mesa 21.0.3 
           direct render: Yes 
Audio:     Device-1: Intel Cannon Lake PCH cAVS vendor: Hewlett-Packard driver: snd_hda_intel 
           v: kernel bus ID: 00:1f.3 
           Device-2: NVIDIA GP107GL High Definition Audio vendor: Hewlett-Packard 
           driver: snd_hda_intel v: kernel bus ID: 01:00.1 
           Device-3: Focusrite-Novation Scarlett 2i2 USB type: USB driver: snd-usb-audio 
           bus ID: 1-6:2 
           Sound Server: ALSA v: k5.4.0-96-generic 
Network:   Device-1: Intel Wireless-AC 9560 [Jefferson Peak] driver: iwlwifi v: kernel 
           bus ID: 00:14.3 
           IF: wls2f3 state: up mac: <filter> 
           Device-2: Intel Ethernet I219-LM vendor: Hewlett-Packard driver: e1000e v: 3.2.6-k 
           port: efa0 bus ID: 00:1f.6 
           IF: eno1 state: down mac: <filter> 
           Device-3: Realtek RTL8153 Gigabit Ethernet Adapter type: USB driver: r8152 
           bus ID: 2-1:2 
           IF: enx9c7bef292227 state: down mac: <filter> 
Drives:    Local Storage: total: 476.94 GiB used: 33.54 GiB (7.0%) 
           ID-1: /dev/nvme0n1 vendor: Samsung model: MZVLB512HAJQ-000H2 size: 476.94 GiB 
RAID:      Hardware-1: Intel SATA Controller [RAID mode] driver: ahci v: 3.0 bus ID: 00:17.0 
Partition: ID-1: / size: 215.90 GiB used: 33.51 GiB (15.5%) fs: ext4 dev: /dev/nvme0n1p6 
Sensors:   System Temperatures: cpu: 71.0 C mobo: N/A 
           Fan Speeds (RPM): N/A 
Info:      Processes: 233 Uptime: 13m Memory: 23.34 GiB used: 1.37 GiB (5.9%) Init: systemd 
           runlevel: 5 Compilers: gcc: 9.3.0 Shell: bash v: 5.0.17 inxi: 3.0.38 

and xrandr --verbose output is:

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~$ xrandr --verbose
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1920 x 1200, current 1920 x 1200, maximum 1920 x 1200
default connected primary 1920x1200+0+0 (0x521) normal (normal) 0mm x 0mm
	Identifier: 0x520
	Timestamp:  12958
	Subpixel:   unknown
	Clones:    
	CRTC:       0
	CRTCs:      0
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	_MUTTER_PRESENTATION_OUTPUT: 0 
	non-desktop: 0 
		supported: 0, 1
  1920x1200 (0x521) 177.408MHz *current
        h: width  1920 start    0 end    0 total 1920 skew    0 clock  92.40KHz
        v: height 1200 start    0 end    0 total 1200           clock  77.00Hz

I hope this can help you to understand what is exactly the problem
thank you

[Spiderspoon]

See my topic: viewtopic.php?f=46&t=366489

This might help.

[SMG]

See my topic: viewtopic.php?f=46&t=366489

This might help.

You do not have the following error message, so your topic will not help.

Code: Select all

xrandr: Failed to get size of gamma for output default

[SMG]

Dear Mint users
I hope you can help me with my Mint 20.3 installation.
I installed the Linux Distro without any problem and using two monitors.
Then (for personal reason) I disconnect and reconnect the monitors (maybe in the other order) but the second monitor is not working anymore.
inxi -Fxz output is:

Welcome to the forum, bifidus_activo.

Your output is showing there is no graphics driver installed. Additionally, I am not sure what desktop you installed because your system is showing Gnome which is not a supported desktop in Linux Mint. What desktop, Cinnamon, MATE, or Xfce, have you installed?

Graphics: Device-1: NVIDIA GP107GLM [Quadro P600 Mobile] vendor: Hewlett-Packard driver: N/A
bus ID: 01:00.0
Display: x11 server: X.Org 1.20.13 driver: fbdev,nouveau unloaded: modesetting,vesa
resolution: 1920x1200~77Hz
OpenGL: renderer: llvmpipe (LLVM 12.0.0 256 bits) v: 4.5 Mesa 21.0.3
direct render: Yes

Is secure boot enabled? You can check by running mokutil --sb-state in a terminal.