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Questions tagged [display]

Questions regarding the display(s) attached to a unix or linux machine, the DISPLAY environment setting, the ImageMagick display tool or (along with X11 tag) remote display redirection

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Independent control of display scale

Just got my first Librem laptop and trying to figure out how to set it up with my two 34in 4K displays... I was able to get one of them working by setting up a custom modeline with xrandr and creating ...
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1answer
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How can I lock the screen of a remote machine?

From https://unix.stackexchange.com/a/505644/674 When you're using SSH, you can access the screen you're connected from by using ssh -X or ssh -Y . Programs can perfectly run on a machine and ...
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How can I find out the X servers (command, or pid) for display numbers?

From https://unix.stackexchange.com/a/17278/674 Local displays correspond to a socket in /tmp/.X11-unix. (cd /tmp/.X11-unix && for x in X*; do echo ":${x#X}"; done) On a computer: $ (cd /...
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Why can't I start a GUI program on the default `$DISPLAY` on a remote ssh server host?

I ssh to a remote host (without X forwarding). In the shell created by sshd on the remote host, why can't I start a GUI program on the default $DISPLAY $ eog Unable to init server: Could not connect:...
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1answer
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What is the difference between a display (or screen) and a terminal?

https://www.x.org/archive/X11R6.8.0/doc/X.7.html#sect4 The phrase "display" is usually used to refer to collection of monitors that share a common keyboard and pointer (mouse, tablet, etc.). Most ...
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2answers
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Does a display server start in a display or a screen or a monitor?

https://unix.stackexchange.com/a/503874/674 says The display is effectively the X server; there is exactly one display per X server. So multiple X servers can’t run simultaneously on the same ...
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Does `$DISPLAY` specify both a listening socket and a rendering target of a X server at the same time?

From Can I specify an arbitrary `$DISPLAY`? Do not confuse the actual display (your monitor(s)), the X11 server ("display"), and the way it's accessed via sockets or other means: DISPLAY=:0 and ...
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1answer
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Can I specify an arbitrary `$DISPLAY`?

My computer has only one display. Does it correspond to $DISPLAY :0? Can an application run on an arbitrary display number, even if I don't see it? $ DISPLAY=:40 firefox Can a X server run on an ...
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2answers
59 views

Forwarding an entire desktop over SSH without third party tools

Something that's always bugged me and I've been unable to find good information on: How can you or why can't you forward an entire desktop over SSH (ssh -X)? I'm very familiar with forwarding ...
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External display briefly turns off under load

I am currently running Fedora 29 (but the same thing was happening under Ubuntu 18.10) on Lenovo X1 Carbon 6th gen. When I am putting my computer under a slight load external display turns off for ...
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How shall I start Vino server (possibly after ssh to the server host)?

I am following https://askubuntu.com/a/530196/1471 to start vino server. (By the way, not sure if related, I had some security problem before after running the commands. See https://askubuntu.com/...
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Making backlight brightness persistent across reboots [duplicate]

I have two X200 Thinkpads. They both have the rather annoying problem that, unless the display backlight is set to its maximal value, it emits an unbearable noise. The odd thing is that one of them ...
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1answer
29 views

HDMI Not detected / HDMI Disconnected

I'm running Linux Mint with MATE. My external HDMI monitors no longer work with my single HDMI port. lspci -v 00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 0b) ...
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CentOS 7.6 Computer Freezes When Changing Display Settings

I am using three monitors and am having an issue where the primary monitor is off to the far left. When I go into the Gnome settings and try and move the monitors around, it freezes. If I unhook and ...
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Making external display DPI settings permanent

System: Linux Mint 19.1 Cinnamon. Hardware: Laptop screen: 3840x2160 + HDMI screen 1920x1080. I have enabled Double DPI in General settings. It works fine for the laptop display, but now I connected ...
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1answer
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What is the relation between X server and display?

What is the relation between X server and display? Can multiple X servers run simultaneously on the same display? Can a X server run simultaneously on multiple displays? Thanks.
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117 views

What are X server, display and screen?

From https://unix.stackexchange.com/a/17278/674 If you run ssh -X localhost, you should see that $DISPLAY is (probably) localhost:10.0. Contrast with :0.0, which is the value when you're not ...
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Linux Mint 19 buggy display on external monitor

I have an older Lenovo P500 laptop (Hardware maintenance manual) w/ HDMI and VGA outputs running Linux Mint 19. I would like to use a Dell E2414H monitor which has VGA and DVI-D inputs. I initially ...
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Setup dual monitor Linux Mint

I'm running Linux Mint 19.1 on my Dell e6530 laptop which has a maximum resolution of 1600x900. I have connected an external monitor capable of 1920x1080 via HDMI and set this monitor as primary with ...
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Third monitor won't turn on Ubuntu 18.04 on Lenovo P51

I can't activate my third monitor, also not from the display settings panel. Here is the output of xrandr ➜ ~ xrandr Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 8192 x 8192 eDP-...
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1answer
35 views

Uniquely identify DP monitors for use in xrandr

I have 2 monitors plugged in via DisplayPort*, named DP1 and DP2. I configure them next to each other like this: xrandr --output DP1 --pos 0x0 --output DP2 --pos 3840x0 Problem: Sometimes, they are ...
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xrandr (1.5.0) artifacting in i3wm (4.16.1) after upgrading Arch Linux

Bit of an unusual issue. I just updated Arch Linux, but I hadn't rebooted in a quite awhile so it might not have even been a recent updgrade. I'm getting some weird artifacting at the bottom of my ...
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31 views

Send to USB attached touch screen monitor with xrandr

I have a project which involves buying a 5'' inch USB Touch Screen (from Raspberry Pi) to create an "info" screen: to control brightness, volume, current music, open shortcuts, etc... I have the ...
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Change position on the graph screen gnuplot in bash script

i have a script in bash that read the file Throughputtx.txt and print this information in a graph of GNUPLOT, but this graph goes to the left side of my screen and I want it to be printed in the ...
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Monitor not waking up on start

I have two monitors (both are Dell u2515); they are connected to the motherboard by a daisy-chain cable, both DP 1.2, but I cannot get both of my monitors to wake up on start. The mointor connected ...
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1answer
21 views

How to distinguish attached monitors?

To automatically change the display layout of the Xserver when I dock my laptop I need not only detect that this event actually happened but also which monitors are connected to be able to distinguish ...
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29 views

Display blacking out on boot (Macbook Linux)

(Please note that I am breaking this out as a separate question from this one I asked earlier: How exactly do the Linux display device files work?) I have a Linux From Scratch system that I've built (...
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104 views

How exactly do the Linux display device files work? [closed]

I don't really understand how the Linux display device files work and interact together. What files in the /dev tree need to go where and where do they need to connect/point to, in order to show a ...
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1answer
87 views

Kali linux installation graphics messed up [duplicate]

I made a Kali linux installation medium using rufus, and live works only in forensic mode. And all other modes like install isn't working. It has to be UEFI: And his happens. I tried DD and iso, ...
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Display keeps blacking out (i915)

I am experiencing a very annoying display problem on my laptop, which I am struggling to troubleshoot: The display is frequently blacking out. When it does this, the system keeps running in the ...
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Reduce used display size for both X server and console

I have the situation that I have a LCD display that I would like to use but I want to have a "black unused frame" around the displayed content. Is there a kernel setting which controls the used ...
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303 views

How to enable the full screen mode for Kali Linux on Hyper-V virtual machine

I have successfully installed Kali Linux on Hyper-V. The problem is that the OS doesn't take the whole screen. It takes only part of it. How to make Kali Linux run on full screen (physical)?
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Display freezes when HDMI is not connected

I have an Acer Aspire E 15 on which I installed Archlinux with XFCE as my DE. However, I find that the laptop's display completely freezes as soon as I disconnect the HDMI cable to my external monitor....
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1answer
149 views

Deepin Linux: Onboard HDMI not working (shows only on boot/shutdown)

I have a Dell XPS desktop with Deepin Linux where the onboard HDMI doesn't work (no signal). Based on the Ubuntu collected from Ubuntu, Deeping is not identifying some HDMI ports (uname/xrandr/lshw ...
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1answer
27 views

Laptop monitor as a server's display

I have connected my server through displayport-VGA cabel to my laptop but my Ubuntu 14 on laptop recognizes it as a view destination, not a view source. How can I revert it and get view from a ...
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Font not displayed correctly (mostly on Qt program), underline '_' not seen

I use Dejavu Sans Mono for default code font. I often find underline '_' unseen because bottom pixel is not displayed. Eg. KWrite (Kwrite's font setting is: "Monospace", normal, size 10) If I ...
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4answers
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Run X program in another user's display

Running Ubuntu 16.04 in host, I have the following setup: a user1, who performed a GUI login in host; a user2, who is a sudoer and is logged in only through a text ssh connection (ssh user2@host). I ...
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1answer
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Display colours look dry and less vibrant with default applications.

My display looks very drab and less vibrant when images are viewed with the default applications (Image Viewer, in this case). And even in Chrome (which is also my default browser), the colours look ...
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1answer
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Thinkpad x61 with Mint 19.1 connecting to TV but NOT to projector

I have a Thinkpad x61 that I plan on using to teach at university. It comes with a tablet screen and stylus. When using Xournal, it allows me to write notes and create narrations very effectively! ...
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Wrong screen resolution sometimes after sleep, with Ubuntu

After my Lenovo T480s connected to a Benq 4k display wakes from sleep, my resolution goes to 1080p, unplugging and plugging the display back in resets it to 4k. (This doesn't always happen, but I find ...
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1answer
124 views

No signal on monitor if no device is attached to HDMI port during boot

I have a very strange issue. At the moment in which udev is loaded (during boot), the video signal is lost on the display if the HDMI port has no screen attached to it (the display is connected to a ...
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2answers
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Linux Service Cannot Open Display

On my Odroid running Ubuntu 16.04.3 LTS I have a python2 program that interacts with a display device (projector). When I run this program from the command line: python ~/imgProc/torcam.py ...
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1answer
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GUI application won't start in Konsole, opened in x2go session

I'm using x2go server on my work laptop and pyhoca-gui on my home laptop. I open an LXDE session and start Konsole. Every app I try to run in Konsole fails to open the display. How do I fix this?
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USB-C AlternateMode not working even after upgrading kernel to 4.19

I have been trying to use an external display with my hp-envy-13 running ubuntu 18.04 for a while now. I was expecting that kernel 4.19 would have the support but it still does not seem to work. The ...
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1answer
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USB-C to DisplayPort Adaper still not recognised in Linux kernel 4.19

I use Ubuntu 18.04 and upgraded to Linux kernel mainline 4.19.2 with ukuu, which purportedly supports DisplayPort alternate mode for USB-C. alex@gta-65:~$ uname -a Linux gta-65 4.19.2-041902-generic #...
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1answer
128 views

How can I prevent a desktop monitor screen from going to sleep when inactive on CentOs 7 Linux?

How can I stop my monitor screen from going to sleep on CentOS 7 Desktop (X Windows) due to inactivity?
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1answer
110 views

How do I detect when a monitor is plugged in or unplugged without acpi, xrandr, /sys and udev?

I've read the answers to this question but I don't have ACPI, the /sys/class/drm/card0-socket/status method does not work and the xrandr method chokes my CPU. udevadm monitor shows nothing when (un)...
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How to vary the amount of red or blue light with xcalib?

xcalib commands follow this structure xcalib -color <gamma> <brightness-percent> <contrast-percent> I then issue two commands as one to try and adjust the amount of red on my ...
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color filter in linux display stack

is it possible to change the displayed color in a monitor, either in its open-source driver, or other middleware in the display stack of a linux system? i came across this question because i visited ...
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1answer
242 views

Am I using Nvidia driver on my Optimus laptop?

I am using Debian Stretch (9.5) and sudo lspci -nn | egrep -i "3d|display|vga" returns: 00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 520 [8086:1916] (rev 07) 06:00.0 3D ...