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Questions tagged [x11]

The X window system (commonly X Window System or X11, based on its current major version being 11) is a computer software system and network protocol that provides a basis for graphical user interfaces (GUI) for networked computers.

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From Internet access single application via VNC like

I am wondering what are my options to access one single gui application remotely, rather than full desktop, as VNC does. Also lag is an issue. Any other way to make remote VNC, super responsive-- may ...
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3answers
924 views

How to release keyboard and mouse from grab by a hung unkillable app? [duplicate]

Suppose I have an X application, which grabs keyboard and mouse as its normal mode of operation (e.g. QEMU), but which, due to a bug somewhere, hangs really hard (e.g. gets stuck in Disk sleep). ...
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1answer
32 views

What does _NET_ mean on X11 window properties?

As a follow up to this question, what does the _NET_ mean in X11? From this answer (by me) it seems i3 takes _NET_x to be a superior form of x. But unlike the definition of the non-_NET_ props, I don'...
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How can I find out which program has mouse cursor locked up? “error: Can't grab the mouse”?

Let's say I run xprop and then I ^Z (or send TSTP), xprop & pkill -TSTP xprop; How do I find what has the mouse cursor locked up? If I try to run xprop again, I will something like, xprop: ...
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1answer
33 views

WM_CLASS vs WM_INSTANCE?

When I run xprop I get a class string that has two values, one of them i3 calls an instance, the other a class, for example on chromium-browser the xprop utility will return something like this, ...
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0answers
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Can't access tty using Ctrl+Alt+F1,F2,F3 etc

Here is what I have tried: $ xev KeyRelease event, serial 43, synthetic NO, window 0x4a00001, root 0x1db, subw 0x0, time 23449801, (434,-234), root:(1305,244), state 0x1c, keycode 67 (keysym ...
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0answers
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nodm display manager - cursor is not visible

I have a machine which uses nodm display manager. x11 works but a mouse cursor is not visible. I haven't found any configuration which explicitly disables a mouse cursor. I guess that there may not be ...
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1answer
31 views

Separate programs - Remain at their designated monitor

Given that the external and primary monitor always has the same resolution, is it possible to have two programs say VLC and a browser open in their separate designated screens? It is worth mentioning ...
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0answers
37 views

ssh X11Forwarding Gtk-WARNING **: 22:56:39.694: cannot open display: 10.255.255.202:0

I have an Ubuntu server on the local net I can ssh to an run say gedit. It works just fine. And a remote Red Hat 7 through a VPN connection which fails. I connect with the command: ssh -X -o ...
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0answers
44 views

No eyes in xeyes over ssh

I have two devices — one a Mid-2009 MacBook, the other a 2008-2009 HP Pavilion — each running Fedora 29. The HP will eventually become headless, but for now, both machines are running KDE. I can ssh -...
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28 views

Xephyr and xorg process

I run Xephyr:Xephyr -ac -screen 1024x768 -br -reset -terminate 2> /dev/null :1 & and then I can run there some window: export DISPLAY=:1 xterm & When I check xorg processes ps ax | grep ...
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Artefact on top-left corner of the screen while logging into console

After some update (probably xorg) of my Debian testing, when I log in to console I have the following artefact on my top-left corner: It is also visible when logging into GNOME 3. How do I fix this?
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1answer
77 views

Ubuntu 18.04.1 LTS - starting second xsession fail

I try to start second xsession on Ubuntu 18.04.1 LTS. I switch to tty3: ctrl + alt + F3 then execute the following commands: export DISPLAY=:2 startx -- :2 but it fails. Logs. What is wrong ? The ...
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0answers
32 views

Which application steals X keyboard events? [duplicate]

In a linux distro there's a hotkey that has grabbed X11-wide to react on it. How do i find out which application is doing that without killing each of them to see when the behaviour stops?
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27 views

No desktop up to 15 seconds after login

I was worried that my computer could be compromised and my login session is being hijacked by some malicious hook. In .xsession executed by xdm, I capture a pstree snapshot a file to debug this ...
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1answer
35 views

Ubuntu 18.04.1 LTS - default DISPLAY value

I have noticed that echo $DISPLAY on Ubuntu 18.04 LTS prints :1 The same command on Ubuntu 16.04 prints :0 Why it has been changed ?
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1answer
55 views

Can a X client (or a process running a GUI program) be a daemon?

Regarding what process is a daemon, https://unix.stackexchange.com/a/175396/674 says The big problem here comes when your system runs a graphical environment. Since GUI programs (i.e. Chromium) are ...
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5answers
2k views

Does an X client necessarily need a window manager to work?

Does an X client necessarily need a window manager to work? Can an X client work with only the X server? If an X client doesn't have a window, does whether it can work need a window manager? If an ...
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2answers
61 views

Is closing the window of a X client application process necessarily followed by terminating the process?

When the window of a X client application is closed, is that necessarily followed by terminating the application process (only attempt to terminate, regardless of success of failure)? When that is ...
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0answers
48 views

Why do we need StructureNotifyMask in X Window Programming? [closed]

I was going through a simple program to create a x window and listen to the keyboard. It involved the following steps: Register for the ButtonPressMask event. XCreateWindow and XMapWindow. This made ...
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1answer
32 views

What happens when type dead key “acute accent” then “o” to produce “ó”?

I'm on Belgian keyboard (/usr/share/X11/xkb/symbols/be) and when I type AltGrù it produces the dead key "acute accent", it waits for another key, o for example, to produce ó. How can I change which ...
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33 views

tigervnc vncviewer could not open some system applications

The computer that I am trying to connect to using vncviewer is a Ubuntu 18.04 system with dash-to-panel gnome extension. When I used the first .vnc/xstartup , I only got black screen once connected. ...
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1answer
66 views

Why is the X server process not a daemon?

root 717 2.0 3.2 1038344 263604 tty7 Rsl+ /usr/lib/xorg/Xorg -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch Is it correct that the X server process is running ...
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0answers
31 views

Lock Virtual Terminals when resuming

Many screen lockers (mine is i3lock) do not block access to other Virtual Terminals. This means that, if I leave a session opened in some VT, then even when the desktop is locked (for example when ...
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0answers
28 views

Does X11 fix the frame rate?

Since I configured my Gentoo, my UID hasn't been added to the video group. And everything was just fine. But when I started doing some GUI programming(the library basically just using openGL for ...
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1answer
18 views

pywal wont run on startx

I'm having some trouble starting pywal through .xinitrc Currently my .xinitrc is: exec dwm wal -i "/home/joe/pictures/wallpapers" & Anyone know what I could have messed up?
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4answers
76 views

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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2answers
134 views

Duplicate screen Xorg over network (Xpra ?)

I'm looking for a way to duplicate my desktop on a network. (Something that would work on a web browser client would be amazing.) I tried to use vnc / x11vnc but quality/framerate is too low. (cpu ...
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2answers
40 views

X forwarding over ssh, issues with virtualbox

When trying to open virtualbox GUI over a forwarded session, I get the following error: steve@remoteHost:~$ virtualbox OpenGL Warning: Failed to connect to host. Make sure 3D acceleration is enabled ...
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1answer
63 views

X11 forwarding seems not working?

i am using ubuntu 16.04. The Server is also running ubuntu 16.04. my /etc/ssh/ssh_config looks so: Host * # ForwardAgent no ForwardX11 yes ForwardX11Trusted yes # ...
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1answer
41 views

libGL errors when starting X applications via SSH

I have read a bunch of similar questions on this site and others, but all of them either didn't reflect my situation or didn't provide a working solution. So I have a Debian stretch x64 server ...
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1answer
32 views

What is the meaning of ownership of a process on a window?

In manpage of xdotool getwindowpid [window] Output the PID owning a given window. This requires effort from the application owning a window and may not work for all windows. This uses ...
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0answers
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Why do `xwininfo` and `xdotool` give me different window ids?

In a tab of a terminal emulator (lxterminal), I try to find out its window id by clicking in the tab and the process which "owns" the window (I am still not sure what is the word to describe the ...
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1answer
97 views

Does an X client process always have one or more GUI window(s)?

Does an X client process always have one or more GUI window(s)? Conversely, if a process has one or more GUI window(s), is it an X client process? Does an X client never have a controlling terminal?...
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2answers
47 views

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
109 views

Ubuntu(Mini) - How to replace the shell of system message dialogs with my own version? [closed]

I'm using Linux Ubuntu 14.04 LTS installed on VirtualBox using mini .iso and trying to make my own distribution based on it. I know, support of that version ends in 3-4 months, I'll update it on my ...
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1answer
33 views

Tmux window switch and SSH - reattach display

I am attaching through ssh -Y to my server, and rotating with tmux to a preexisting window. The problem is, if I just export DISPLAY=:<port ssh used originally for X> evince #for example On ...
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1answer
53 views

Flickering and artifacts when capturing screen using ffmpeg and x11grab

I'm using the following command to capture my screen: ffmpeg -f x11grab -video_size 1920x1080 -i :0.0+1920,0 -c:v libx264 artifact-test.mkv The resulting video contains flickering artifacts that look ...
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0answers
40 views

How to get the available X cursor sizes?

Suppose you have several X cursors on your system such as golden-xcursors or silver-xcursors. I already know it's possible to specify which cursor size you prefer by editing ~/.Xresources. For example:...
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1answer
23 views

No clipboard support with X11forwarding?

I've successfully setup X11forwarding from Linux to Mac. Now I'm able to run Thunar and get a window locally. But the clipboard is not shared between the Thunar window and Mac computer. Any ideas?
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1answer
58 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
69 views

X11 ignores preferred mode

Problem I'm transitioning the configuration of my multihead monitors from using some rather ugly scripts to /etc/X11/xorg.conf.d/10-monitor.conf. My layout has two monitors of 1920x1200, one rotated ...
1
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1answer
58 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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1answer
100 views

X11 Error When Run as a Docker Container

I'm trying to run an application from a Docker container which is supposed to open a GUI widow (a video stream in my case). The Docker container is run on a Raspberry Pi and I SSH into the Pi from my ...
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1answer
86 views

Downgrading libfontconfig1 causing Fontconfig error

During the building of dwm, I was prompted that X11/Xft/Xft.h cannot be found and apt-get can't install it because libfontconfig1 is 2.13.0-5 while 2.11.0 is required. So I downgraded the ...
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2answers
52 views

What controls the mapping between Ctrl+Alt+F keys, TTYs and X sessions?

On my CentOS system, Ctrl+Alt+F1 shows the X Windows session known as :0, but on other systems Ctrl+Alt+F7 may do the same thing. What determines how Fn keys are mapped to X sessions and TTYs? ...
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1answer
145 views

How to set custom property with xprop and open that program in one line?

I tried this: xprop -id $(gedit & echo $!) -f MY_VAR1 8s -set MY_VAR1 MyCustomVar Than i tried to xprop and click on the gedit window - MY_VAR1 was not present there. So i thought maybe i ...
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0answers
28 views

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
344 views

modprobe: FATAL: Module fbcon not found. Number of created screens does not match number of detected devices

I am using debian. I recently have purged X11 and xcfe4 and reinstalled them both but whenever I lauch Xorg --configure I get this: (++) Using config file: "/root/xorg.conf.new" (==) Using system ...
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1answer
113 views

Xvfb: export display permanently

I have recently set up Xvfb on Centos 7 machine. It is working absolutely fine. Only problem is that if I quit putty session (remote access) it would keep running Xvfb in background but display ...