Questions that relate to the electronic display (sometimes called a visual display unit) for computers. Typically questions relate to visual issues such as flickering, resolution, black-screens together with the usage of single and multiple displays.

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7
votes
2answers
7k views

Automatically kill a process if it exceeds a given amount of RAM

I work on large-scale datasets. When testing new software, a script will sometimes sneak up on me, quickly grab all available RAM, and render my desktop unusable. I'd like a way to set a RAM limit ...
7
votes
0answers
2k views

Using an iPad or Nexus 7 as an Ubuntu Second Monitor

Is there any way to use an iPad mini or a Nexus 7 as a second monitor through a cable? I dont want something like vnc, I need it to work through the usb cable (or any other cable). I imagine that the ...
0
votes
0answers
19 views

Suggest me the tools for display testing on Ubuntu [duplicate]

I'd like to test my new Dell monitor but I don't know what the tools should I use for it. I'd like to detect if there are bad pixcels and other color characteristics of the display.
0
votes
1answer
74 views

Ubuntu 64 bit 16.04 LTS on laptop Hp Pavilion X2 external HDMI monitor stopped working after latest updates

It seems that Ubuntu is really a problem on HP computers. Now, the new problem is that after the last updates of 16.04, the HDMI port stopped working. I tried with a different monitor and the problem ...
2
votes
2answers
4k views

Correct Display configuration. Errors while trying to arrange displays

I am trying to set up my tv with my laptop trough a VGA cable. The display application in Ubuntu throws a lot of errors to me and I have given up in trying to do it myself. I try to apply the 1920 ...
1
vote
2answers
9k views

Second monitor recognized but only black screen

I am running 12.04 on a Toshiba Portege laptop. The graphics card is an Intel 945GM/GMS. The 2nd monitor is an Asus (Ancor Communications 22"). When I connect the monitor to the computer the monitor ...
3
votes
2answers
7k views

Turn off laptop display and have monitor

My laptop display has stopped working and is unfixable! Anyway, I got a full HD monitor and plugged that into the HDMI port of the laptop. I have changed the power settings so that I can close the ...
1
vote
0answers
129 views

16.04, Nvidia GTX 950, HDMI: Unknown Display

I just freshly installed 16.04 including all updates. I installed the nvidia-367 drivers which work. Unfortunately, my Asus display that is connected to the Nvidia GTX 950 via HDMI, is not properly ...
0
votes
1answer
187 views

Second monitor not working after Xubuntu 16.04 upgrade

I just upgraded from Xubuntu 15.10 to 16.04 via dist-upgrade. After I restarted, the monitor that is connected (via HDMI-to-DVI-cable) to my laptop wasn't recognized anymore. I already restarted two ...
0
votes
0answers
39 views

Need help getting back the plymouth splash screen with the right resolution (after nvidia install)

Normally I never have any problems getting back the plymouth splashscreen after installing nvidia drivers in Ubuntu or Linux mint etc. But now I've installed Ubuntu on an old PC with a APG (Geforce ...
1
vote
3answers
5k views

2560 x 1080 Screen Resolution on Ubuntu 14.04

I recently installed Ubuntu 14.04 on a mac mini and bought a 2560 x 1080 ultrawide LG monitor for it. Problem is that it doesn't display the proper resolution, the maximum being 1920 x 1080 under ...
3
votes
0answers
1k views

15.10 Dell XPS 15 (9550) External Monitor not waking

I'm in Ubuntu 15.10, with Kernel 4.3. Things are working better than I could ever imagine. Other than ONE bug... When my laptop turns off it's screen and my external monitor's screen (I have it set ...
0
votes
0answers
49 views

Ultrawide monitor only showing desktop on part of the screen

I'm currently running Ubuntu 16.04 LTS on a MSI Dominator Laptop, and with the laptop screen disabled and only using my external monitor (LG 34UC88 @ 3440x1440 21:9) Ubuntu refuses to display across ...
3
votes
0answers
2k views

How do I remove black bars on top and bottom of my display?

I have a problem with my ubuntu 12.04 LTS. It shows my Samsung Electric Company 17'' strange. It is not centered. I have a black space up and right. The pictures will explain better my problem: ...
0
votes
0answers
22 views

Intel NUC with ViewSonic 24" has snowy screen aliasing

I believe what I'm experiencing is "aliasing" of certain colors on my monitor, but I might not be using the best terminology. Here's what's happening: Certain colors, like the default Kubuntu ...
0
votes
0answers
18 views

airodump-ng not working

I am a beginner to Linux. I am having trouble with the command airodump-ng mon0. As soon as I do it I see the error: Interface mon0: ioctl(SIOCGIFINDEX) failed: No such device. I have tried: ...
0
votes
1answer
464 views

HDMI stops working with my new Acer aspire E3-112

I bourght a new Acer Aspire E3-112. I use external screens both at home and at work. After installing Ubuntu everyting worked. I used it at home and at work. The second day when I got home the ...
1
vote
0answers
28 views

Ubuntu detects a fake monitor each reboot

When I turn on the Ubuntu, it detects a monitor that does not exist and I must desactive it each time I log in my session: What can I do to delete permanently this fake monitor? The system is ...
0
votes
2answers
37 views

How to show size Ram and CPU ussage in Ubuntu?

I am newbie in use Ubuntu so I don't know how to show Ram and CPU usage which is the same in Task Manager on Windows. It can show by command line in Ubuntu or Application to see more.
1
vote
1answer
62 views

Built-in laptop monitor is not detected anymore

The problem The built-in monitor of my laptop is not detected and goes blank at the login screen. However an external monitor connected to the VGA port is correctly detected and gets recognized as ...
1
vote
0answers
19 views

Monitor : no image after turning off then on

I would like to use my monitor as display for two computers, so I would like to switch the input as I want beetween the computer 1 and the computer 2. When I switch on the computer 2 everything is ...
3
votes
2answers
70 views

chrome resolution changes when monitor is turned off

Having an issue with Google Chrome resolution/dpi changing when I turn my monitor off. I'm pretty sure that this is all related to the scaling factor from Universal Access Panel. in which I have large ...
0
votes
0answers
25 views

How to install a resource monitor in Xubuntu 16?

I want to install something like this: But I researched and I don't find anything. Thank you.
0
votes
0answers
40 views

Primary screen turns off after disconnecting external monitor

I have a Dell external monitor connected to my ASUS UX305UA laptop. I use HDMI port, which is connected to HDMI-VGA converter, which connects to the monitor. When I turn on my laptop and connect the ...
0
votes
0answers
21 views

How do I fix overscan?

Please don't mark this as duplicate! I have read many similar question but could not find a good answer for my situation. I am running Ubuntu 15.10. I have a Sansui SLED2900, which works fine over ...
0
votes
0answers
75 views

Ubuntu flickering @ 144hz AMDGPU

I need some help. I've been trying to get 16.04 on my system since the second alpha came out but sadly whenever I try to run it the screens starts flickering like crazy when I start going through ...
0
votes
2answers
2k views

BandWidth Monitor

New to Ubuntu, I want a application which monitor my Bandwidth usage in GUI for Particular time. Is any application is available for my requirement? For ex: If I need to monitor for a month at a ...
0
votes
0answers
123 views

Unknown Display on ubuntu 16

Hey I'm having trouble with my display. When I go to System Settings > Display the monitor shows as unknown display. I've googled and tried a couple of solutions they offered and nothing, changed ...
0
votes
0answers
20 views

How to completely reset xrandr

Is there any command which completely resets all settings of xrandr? I have checked this and this but the command xrandr -s 0 does not reset brightness.
0
votes
0answers
23 views

Ubuntu 14.04 Can't Connect External Monitor

I install ubuntu 14.04, after that my cursor blinking and sometimes it's gone, so i search how to remove it and i found a solution that offer me to delete the unknown display from my terminal, so i ...
0
votes
0answers
12 views

Triple Monitor Wont´t Work

Triple Monitor Setup https://youtu.be/AaNNW9SfdZY There is a video of my error. Because i have 3 Monitors. A Laptop and 2 Monitors. And with 2 Monitors it works just fine
0
votes
0answers
55 views

mdadm monitoring script after boot

the mdadm monitoring program is not working after boot. When i kill the process afterwards and run mdadm --monitor --scan again, everything is ok and the script runs on failures. Here ist my mdadm....
1
vote
1answer
113 views

How do I set refresh rate on each monitor invidually?

What am I suppose to write to set each monitor on its own Refresh rate? I can write xrandr -s 1920x1080 -r 144 but that does apply on both monitors which makes my 60hz monitor go black.
2
votes
0answers
90 views

Two monitors - primary, secondary?

I use Ubuntu 16.04 LTS and to motherboard (GA-Z170-D3H with Intel HD Graphic 530) I have connected two monitors. First (primary) on DVI and second (secondary) on VGA output. Secondary monitor I can ...
9
votes
6answers
39k views

Webcam doesn't work in browser…?

I'm running the latest version of Ubuntu, and I have a Dell Sp2009wfd monitor with built in microphone and webcam. I've gotten the microphone working on mumble and on sound recorder, and I've gotten ...
2
votes
0answers
727 views

Dual display not working after 16.04 upgrade

I recently upgraded from 15.10 to 16.04 via dist-upgrade. Immediately afterwards, my second monitor stopped working. I am using an AMD 7850 APU, and both monitors are plugged in to the motherboard - ...
0
votes
1answer
130 views

Xubuntu 16.04 external monitor

Ok, my first question here is simple: I have xubuntu 16.04 LTS on Laptop X86_64. The laptop can handle ubuntu xenial xerus to but I like xubuntu. It works like a CPU because I link It to a big ...
0
votes
0answers
6 views

using CDPR to discover my MACHINE from a router

hey i am using Ubuntu trusty tar, i have installed cdpr on my pc. this helps me track my pc when connected to my network. when i type the command sudo cdpr -d eth0 i can see the router to which i ...
33
votes
4answers
66k views

How to calibrate the monitor on an Ubuntu system?

What is the procedure to calibrate the monitor and what software to use? Edit: I think what I mean is "colour profile" if that's what it is called. I happened to notice that the same photos look very ...
1
vote
1answer
75 views

Set “default” monitor

I would like to be able to set my "default" monitor to be my external 25' monitor instead of my laptop one when I have my external monitor connected. Many applications always open on the laptops ...
0
votes
1answer
44 views

Screen resolution is sometimes too narrow on boot, fixed by rebooting

I'm running 64-bit ubuntu 14.04. I'm experiencing a problem that started just a few days ago: every now and then, on reboot, my screen resolution is too narrow, with black unused screen space to the ...
0
votes
0answers
13 views

How to monitor the Drop Box port in my office environment

someone is misusing the drop box in my office. I want to figure it out who is using it and what he does with drop box. Can anyone tell me the process to keep track of the employees on this. As an ...
0
votes
0answers
48 views

How to check ssh tunnel status and create alert

Can anyone please help me to write a shell script checking ssh tunnels status and create alert in case a tunnel dies? Also some log must be created in var/syslog once a tunnel is created or dies. ...
1
vote
0answers
18 views

Monitor CPU and bandwidth usage of cpu and save to csv

I would like to monitor a specific process. I need to know timestamp, CPU usage (%) and Bandwidth (tcp upload and download in % or byte/s) of this process. I have tried something like this: ps -Ao ...
5
votes
2answers
11k views

How to prevent my screens from turning off, when the screen is locked?

I would like to have my screen fully powered at all times, but it goes to standby once I lock my PC.
2
votes
2answers
2k views

Ubuntu 14.04 with unrecognized monitor (or without monitor) - boot problem

I've Ubuntu 14.04 installed on my computer. I need to start it even if not any monitor is plugged. Basically I need to do that because at the startup my monitor isn't recognized but plugged in. That'...
0
votes
0answers
28 views

Ubuntu 14.04 Connect an External Monitor

When i connect my laptop with external monitor, the monitor not detect my laptop display, how to enable it? i once uninstall unknown display at the first i install ubuntu because it makes my cursor ...
0
votes
0answers
60 views

Second monitor is detected but doesn't work [ubuntu 15.10]

I just installed ubuntu 15.10 on a HP EliteDesk and one of the monitors doesn't work correctly. Displays recognize both monitors (Hp Z27n and Hp ProDisplay P201) but only the Hp Z27n is working. ...
0
votes
0answers
19 views

Ubunutu 14.04 + Latitude E6420 + U2715H Monitor

I just got the U2715H monitor, I had no problem connecting it to my laptop (Latitude E6420 , Intel HD3000) , it was recognized and I got a cleat picture. The problem starts when I drag a window ...
0
votes
1answer
56 views

Visual fatigue in Ubuntu

Hello I have a problem with ubuntu. Visual fatigue is the problem. After using my pc, my eyes feel really tired. The problem? I have an LED monitor so it's not the technology that's the problem, ...