Questions tagged [monitors]

Computer monitors (i.e. screens or displays). For system/application monitoring, please use the /monitoring tag.

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How do I turn off my HDMI monitor?

I tried xrandr --output 'HDMI-A-1' --off which puts the screen as black for only a few seconds and doesn't turn anything off. xset -display :0.0 dpms force off does the same except it shows me the ...
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Reverse prime: serious screen glitches when mirroring displays

I have a Lenovo Legion Slim 7 laptop (15ACH6) running Manjaro 21.2.5 on kernel 5.16.14, in hybrid graphics mode. The USB-C ports are connected to the dedicated GPU (NVIDIA GeForce RTX 3060), so I have ...
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in my external monitor with max resolution everything looks big and ugly, how can I fix this?

when I connect my external monitor everything looks so big, the code font in my editor inside my laptop has a small and pretty font but when I move to the external monitor is like a zoom instead of ...
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Raspbian - Forcing monitor to 120 Hz

I have a 165 Hz monitor, and a Rpi 4b. In the raspbian monitor configuration, I can only push my monitor at 60 Hz, but my monitor supports 144 Hz on HDMI. For clarity, my question is NOT about my ...
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How to make a KVM (built into the monitor) connection work , using a DisplayPort/Usb-C cable connected to a thinkpad dock

In this setup, the other device connected to the KVM works well with HDMI + Usb-B connection. Video signal, mouse and keyboard are ok. But on the other side, I have an Thinkpad T470S with Linux 5.16 ...
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archlinux, out-of-sync at monitor connected to linux machine

I have a few linux machines with Archlinux installed, each are connected to KVM switches, but most of time all machines are remotely connected. I don't use X so no X stuffs are installed. At some ...
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How to inspect different monitor contrast on standby resume?

I'm using an external 4K Monitor on my notebooks docking digital port. Resuming from standbye results in a much brighter contrast compared to booting. In particular I notice the difference in Xorg ...
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Valid values for a xorg.conf(5) Monitor Identifier?

I have a Dell P2210 monitor. Its EDID data is somewhat conservative. I am currently using the following file, which works as expected: # Ubuntu: /usr/share/X11/xorg.conf.d/20-DELL_P2210.conf # Other: /...
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Not able to invert colors | xcalib -a -i stopped working

I used the command xcalib to invert the colors on my screen and it was working fine for a long time till suddenly somehow it stopped working.I am unable to diagnose as to what has caused this. Now ...
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Asus VK222H not detected properly

My Asus VK222H screen is not being detected properly (on display, it shows 'Ancor communication...' ) I was wondering if it's a drivers issue (they do not provide them for linux on https://www.asus....
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Detect Frame Per Second of an LCD screen

I am trying to find the frame per second of an LCD display in a Linux system. The display resolution is 640*480. The display is a 24 bit LCD screen and we use 32-bit frame reader driver(/dev/fb0) to ...
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gsd-color color transform matrix permission denied

I am investigating a monitor wakeup problem and one of the errors noted by journalctl is: Jan 03 14:24:11 konradsdesktop gsd-color[1238]: failed to set xrandr-Samsung Electric Company-LC32G7xT-...
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Video glitches when files are played in fullscreen (screen tearing in VLC & MPV in Debian11/KDE)

When playing videos like movies with the Kodi media center, the videos often have lots of glitches. I tried it with the VLC player, MPV and DragonPlayer on Debian11/KDE and it occurs with all of these ...
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How to overclock monitor by adjusting pixel timings on Linux?

This guide shows how to apply the timings, but it doesn't explain how to tune those timings. Adjusting monitor timings on Linux is different than with CRU on Windows.
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KDE Plasma, external monitor border window is of out the screen

I've connect via hdmi an old monitor to my laptop - Samsung SyncMaster XL2370 - and I have display problem: the monitor only show part of the actual screen. On every border, part of the screen is ...
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Acer Monitor - Webcam not working

I have an Acer B277 monitor with an integrated webcam. Even after connecting the HDMI cable, the webcam refuses to work. I dont see any separate drivers available from the Acer website for this. How ...
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Turn off/on laptop display from TTY without additional software

I have a laptop with Artix Linux on it that I'm using as a web server. I want to keep it minimalist, w/o graphical environment and only the absolute necessary software. My problem is I still don't ...
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Mouse/Keyboard/Monitor/Touchscreen stopped working Ubuntu 20.04LTS

My touchscreen monitor (GeChic 1306H) that connects vis hdmi and usb (for touchscreen), my Mouse and Keyboard (usb and/or Bluetooth connected), stopped responding yesterday. Maybe there was an auto ...
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Xorg and xrandr detect a connected monitor that doesn't exist

I'm on a laptop with no additional monitors connected, but when I run xrandr -q, the output lists two connected devices. Xfce's Display settings dialog also shows two monitors, and so does Xorg.0.log. ...
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How can I have two mirrored displays (laptop screen + TV monitor) with different resolutions?

My output of xrandr is: Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767 eDP1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 340mm x 190mm 1366x768 60.02*+...
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How to mirror a screen in TigerVNC?

How to mirror a screen? I have an answer (VNC). A Linux VNC server - https://help.ubuntu.com/community/VNC/Servers.
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How to setup :0.1 virtual display on-the-fly in X

I want to create a virtual monitor, add it to my current display as a seperate screen (In X sense) and share it over VNC. Now what I want to do is neatly described below in Arch Linux Wiki article on ...
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What keeps waking up my screen?

I have screen energy saving enabled, but my monitors never turn off automatically - even when the screen is locked. I can -briefly- manually turn them off using xset dpms force off, but in a couple of ...
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Low refresh rate on Wayland

The highest refresh rate in my GNOME on Wayland in Fedora 34 (or GNOME on Wayland in Ubuntu) is 60.xx Hz, whereas it is 120.xx Hz in GNOME on Xorg. Why is this, and is there any way to enable the ...
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Different scales for join displays?

Is it possible to have different scales for join displays? I tried the solution suggested here: gsettings set org.gnome.mutter experimental-features "['x11-randr-fractional-scaling']" but it ...
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External monitors wont connect after --reinstall udisks2

my Ubuntu cat /etc/os-release NAME="Ubuntu" VERSION="20.04.2 LTS (Focal Fossa)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 20.04.2 LTS" cant see my two external ...
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How can force Debian 10 to set black screen but staying activated for a ssh connection

I have a Debian 10 Buster installed. I have GDM3 as window manager launcher and enlightenment e17 also installed. I can't manage to get my monitor to black screen when I don't use it for example until ...
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FHD monitor only works after booting from other monitor and switching when running

This is a weird one.. I have a FHD AGI260T 26z monitor connected with DVI-D (computer) to VGA (monitor). Computer is a Cisco VXC 6215 box running Debian, Ubuntu or whatever live usb. Problem with all ...
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How can a udev symlink be made for a monitor?

I am currently using ddcutil to be able to change the brightness of all of my monitors at once but my script is flawed(slower) because I do not know the bus id's of my monitors ahead of time. I know ...
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Which Linux distros have good multi-monitor support for differing DPI, scaling and resolutions?

Which Linux distros have good multi-monitor support for differing DPI, scaling and resolutions? I have 4 27" monitors with 3 resolutions between them: 1080p, 1440p and 4k. Windows handles per ...
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GSync/FreeSync status of plugged monitors

Is there any environment variable that we can check to know if GSync or FreeSync is activated? Or is there a software that can tell both for us? Or just one of them?
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External monitors and backlight control of internal monitor don't work with ThinkPad E14 Gen 3 (AMD Ryzen 5500U)

I have installed a Debian Sid with kernel version 5.10.0-7-amd64 on my new ThinkPad device. When I connect external monitors via the Lenovo USB-C dock or even the internal HDMI socket, they are not ...
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Screen turning off and on repeatedly when on GNOME lock screen

GNOME (or some related software) is breaking my monitor. Every time I lock GNOME (Super-l) the monitor goes into some sort of reset loop, alternately showing the lock screen and blacking out, each for ...
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Scale down my external display

I am using Elementary OS Hera.I have an external display (43 inch 1920x1080) and my primary display is my laptop (15.6 inch 1920x1080). When I connect the external display to my laptop, the font size ...
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1 answer
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Remove detected resolutions

There are many articles about how to add undetected resolutions. My problem is the opposite: gnome-control-center shows many resolutions I won't ever use. Here is my list with 33 entries on a ...
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Unable to detect second monitor via HDMI port

Fairly new to the Linux world but any support from the community would be appreciated. The core of the issue is I'm having a hard time understanding why my laptop isn't able to detect a secondary ...
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Multiple dummy monitors on remote headless Linux for VNC to local multiple monitors

I submit defeat. I have been trying to configure my remote Linux box to have two dummy monitors so that I can use multiple local monitors to VNC into it. I'm surprised that no one else has needed help ...
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2 votes
1 answer
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How to save lxrandr settings for next time?

I am running Window Maker. I used lxrandr to set the screen size, and settings for when a second monitor is added. The problem is, after restarting the computer, it reverts to the default settings. ...
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How change monitors from terminal ? "xrandr: Cant open display"

I'm booting Sparkylinux from a live-usb in a notebook with broken screen. There is a external monitor connected by VGA. The external monitor is booted dual with the notebook monitor And the external ...
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Restrict monitor access to certain apps

I have two monitors setup on my machine. I would like to prevent some apps from accessing one of the two monitors while still granting permission to other apps. I would like to restrict an application ...
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Gnome settings only offers 49.99 Hz for a 60 Hz monitor

I have a 60 Hz monitor, but Gnome 40 settings only allows 49.99 Hz (and 29.99 Hz) in it's settings. I'm running Wayland, obviously. Why is that? Gnome's animations don't feel smooth either, can that ...
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My 2nd Monitor suddenly stopped working

So I was trying to use my second monitor on my Ubuntu laptop for class as usual, but for some reason it wasn't picking up signal from my laptop at all. I tried to see if it was a problem with my ...
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Multiple monitors quit working/not displayed in 'Displays' (CentOS 8)

dup of this post on Superuser I have been using the following kernels from my GRUB menu: CentOS Linux (4.18.0-240.15.1.el8_3.x86_64) 8 // broke it all CentOS Linux (4.18.0-240.1.1.el8_3.x86_64) 8 // ...
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FreeBSD vidcontrol mode not working properly

I'm running FreeBSD 11.4 on an old Compaq Presario 3550. I want to take advantage of the full 1024x768 display, but vidcontrol doesn't seem to be working properly. This is what I've done so far: ...
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Turn off DDC/CI for my Monitor

I have 3 monitors. 2 are Dell the other is Asus. When I turn off all 3 monitors, and then turn them back on in the morning, all the windows that were open on on the Asus monitor have been moved to one ...
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how to get the status (on/off/lock) of the monitor of a remote host

I login to a remote ubuntu host by ssh. Is there any command that can check if the monitor of the remote host is power-on/off or locked?
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Disabled laptop monitor, can't reenable it

I wanted to switch off power to my laptop monitor when plugged in to an external monitor, as on my distro (Manjaro 20.2), disabling the laptop screen with xrandr/arandr doesn't switch off the ...
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Second monitor recognized, but displaying "no signal" - Ubuntu 20.04

I recently started using Ubuntu 20.04, and in all my installations I always get the same error when displaying my second monitor: "no signal". I can see that my cursor reaches another screen ...
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HDMI Port not working - Lenovo Thinkpad T570 with Ubuntu 20.04

I try to connect my Lenovo ThinkPad T570 via the HDMI port to my monitor but it seems like my Ubuntu 20.04.2 LTS using GDM3 does not recognize it. I already verified that the HDMI cable is working ...
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Linux blank screen on laptop, but external hdmi monitor works

I have Arch and Asus zenbook ux431f with i7 and nvidia mx150. After install -> blank screen on my laptop monitor but hdmi monitor works. After many researches i've found this https://github.com/...
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