Questions tagged [signal]

signal is a sequence of states in a communication system that encodes a message.

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How to "signal" to a windows process?

I need to signal to my daemon program to reload its configuration. I am a GNU/Linux developer and I usually use SIGHUP signal for this. What are the similar way to do this with program running on ...
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Cannot kill a process after waking it up

I ran the program yes and pressed Ctrl+Z to stop the process. After that, I woke it up by executing kill -s 18 <pid>. After that, I wasn't able to stop it again using Ctrl+Z or kill it using ...
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Monitor is showing no signal when connected to the PC. Its works perfectly fine when I connected it with a laptop

My monitor is Acer Nitro VG271U 1440p 144Hz monitor. It is showing no signal when connected to the PC. Its works perfectly fine when I connected it with a laptop. The PC is relatively just a few ...
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Windows 10 wifi icon missing, can't pick up signals, limited connections in Firefox

Windows 10 did an update that made my laptop fans/hard drive go crazy and crashed my system. Since that "update" and restarting my wifi icon from the taskbar/notification area is missing. I'...
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How to add power to usb 2.0 cable, and don't lost transfer. What to buy

I have a USB 2.0 signal cable without power. (connects the piano with the tablet). These are my ports / terminals: male, USB 2.0, type A (end of piano midi cable, without power, only signal) female, ...
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Computer acting as Thunderbolt "client" and passing through

I have a desktop at home, but also a Thunderbolt enabled laptop. If I wish to utilize my display, audio interface, keyboard and other peripherals, I connect to an old Thunderbolt dock. The issue is ...
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What other encrypted messaging platforms are there like Signal that provide encrypted form of communication without going through 3rd party servers? [closed]

I was wondering what other messenger applications that are like Signal that is fully encrypted for communications without. Is there one that doesn't involve a 3rd party but peer to peer chatting and ...
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ffmpeg - Encode audio as list of samples

I would like to produce a numeric list of amplitudes from an audio file. I should be able to: Specify the sampling rate (16kHz, 44.1kHz, etc) Specify the data type of the amplitude samples (8 bit ...
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How to detect a input signal of a non standard keyboard button ? Asus ROG laptop

I am looking for a way to trigger some stuff when I press the 'ROG' key on my keyboard which is Asus specific. When I run showkey it doesn't output any value. Do you have any idea if there's a way ...
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how to read PWM (pulse width modulation signals)

I am developing embedded Linux driver level program in Toradex Apalis Tk1 development board with IXORA career board, and with operating system is Embedded Linux. I need to know that how to read PWM ...
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How can i find out which sort of technology a propriatery wireless device uses to send their signals

Hello I'm a type 1 diabetic and I've been offered what's called a continous glucose monitor. Now I'm also sort of paranoid about having too many signals in my surrounding, I know the consensus is that ...
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How to remap interrupt signal in zsh

In bash I can remap Ctrl-C or interrupt signal to Ctrl-J by this line stty intr ^J In zsh it doesn't work neither stty intr \^J How to remap interrupt signal to Ctrl-J? OS: Ubuntu 18.04
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Bash trap command behaves differently under two terminals

I'm trying to write signal handlers in Bash scripts, testing under a Ubuntu 16.04 machine. Here I'm using the trap command: #!/bin/bash trap "echo hi!" SIGINT SIGTERM echo "pid is $$" while true; ...
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How does HDMI-to-RCA cables without converters work?

While looking for some HDMI-to-RCA converters I found out that most of them are simple cheap cables from China without any conversion circuits Kebidu 1m Wholesale 1080p HDMI Male to RCA Male Adapter ...
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what does an equality inside a plot function in MATLAB mean?

So I´m just new on MATLAB and this may be a very silly doubt but when generating basic signals for signal processing I have this: t = (-1:0.01:1)'; impulse = t==0; plot(t,impulse) (from: https://...
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How to split HDMI signal to two displays (not at the same time) [closed]

I would like to run my PC on my monitor (for work) or sometimes on my TV (for gaming), not both at the same time. What kind of adaptor am I looking for? I've tried searching but was unable to find ...
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Why does the CPython interpreter ignore TERM when run in container?

If I start a Python process in a container with docker run --name python python python3 -c "import time; time.sleep(3600)" And try to terminate this on another console with docker stop python the ...
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Can I receive stronger signals from nearby routers if I get a powerful antenna?

I have a netgear wireless wireless adapter without a antenna which i can receive signals from routers which never appear on my macbook or phone but there is AP rate limiting. Like if my friend lives ...
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2 votes
2 answers
11k views

Using network extender to connect to WiFi network that also requires user name

To connect to my university WiFi, eduroam, I need to type my user name and password into Windows' network configuration app (system tray, no web GUI). The WiFi signal is however weak from my current ...
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What does IOT mean in regards to SIGIOT?

I've been looking around and I found that it was related to an abort call, Something to do with an IOT trap, but any resource I find seems to assume you already know what that is. Probably isn't ...
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DTMB compatible streamer server

I know TvHeadend is an open source streamer server that supports a wide variety of Digital Television standards. TvHeadend doens't supports DTMB according to the official site. Is there any open ...
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How to reliably remove all temporary files created in a script?

Is it possible to trap the exit/return of a function? For a program I could do trap -- "clean_this" EXIT That would execute the function clean_this when the program exits. I would like to do ...
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How to automatically freeze a process when its window is not focused?

I would like to freeze Firefox when I'm not using it. I can manually send SIGSTOP and SIGCONT signals, but obviously this is annoying if not automated. I use the i3 window manager, if relevant. ...
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tmux status bar keeps echoing on gnome terminal

I'm unable to find the search terms for this problem, so I've attached a screenshot. Every minute, the tmux status bar outputs a new status line instead of updating. This seems to happen mainly on ...
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Mic signal bleeding into speakers

So this is a very strange problem. Sometimes, pretty rarely whenever I am actively using my mic I can hear myself in the speakers repeat what I've said a couple of seconds ago. I've been trying for a ...
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The shape of a Wifi router's broadcast

I'm curious as to the shape of WiFi broadcast. Does it go up, out, and then fall, like an umbrella shape? Or is it imperfectly spherical in shape? I know antenna can shape the signal to a certain ...
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How to refresh Chrome remotely?

I have Chrome running in kiosk mode (it displays my HTML/CSS/JS application - so I have control over the whole stack). From time to time, I need to refresh its static content, that is reload the HTML,...
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Cannot get signal out of GeForce 9800 GTX while installed

I am installing an EVGA GeForce 9800 GTX into one of my PCs but I cannot get a video signal out of it while it is installed. The computer works fine while the graphics card is not in it's PCIe slot, ...
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1 answer
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2 routers in the same network - signal issues

I've got a weird issue in my brand new house. Asked few smarter than me people, so far without success. BACKGROUND: My house has got 2 levels (ground and first floor). Internet cable from the very ...
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How do I kill a stuck ssh connection without closing the konsole window?

I use KDE (with ubuntu) and love using konsole as my terminal. I ssh a lot and every now and then (from various reasons) my connection dies and the sesson is stuck. I need to send a SIGHUP to the ...
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Weird issue with usb 3.0 port and keyboard

I bought a new computer and installed Windows 7. As I see and understand I have USB 3.0 drivers already installed. When I tried to install from Intel, I got a message that I already have newer drivers ...
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What happens when a process ready to execute but out of the CPU receives a signal?

I know pretty well what happens when it is running and when is blocked, but the behaviour when the process is in the ready queue is something unknown for me. Thank you for the time.
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Command prompt : Move running process to background

In most Linux shells, you can "stop" a running process foreground with CtrlZ and use bg to move it into the background. What's the Command Prompt equivalent? This should be a duplicate but I couldn'...
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Setting up router on wireless network

I am living in an apartment connected to a wireless network. I don't know anything about the physical router. There is no ethernet wall jack. Can I purchase a new router, set it up on this connection, ...
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4 votes
1 answer
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Linux: How does user log out work

I'm new with linux. I've searched about how to safely log out other user and found few solution but I want to know how they work internally. I have few questions: 1. pkill -KILL -u {username} Does it ...
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My pc screen keeps starting up with Check signal cable

My pc screen keeps starting up with Check signal cable. What does this mean and What can I do? Thanks Bev
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Send an electric signal with raspberry PI

i would like to know if it's possible to Start my computer with my Rasp Zero, not with WAKEONLAN or things like that, just an electric signal as if i was pushing the power button. From a internet ...
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How to start a Google Crome app from command line?

I installed Signal Private Messenger and it's now in the list of apps at chrome://apps. How can I start the app directly app from the command line?
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How to improve wifi coverage when my router needs to be in an awkward place?

I live in a 1100 sq ft (100m²) apartment. I receive internet via an ethernet cable in a small space inside one of the bedrooms, far from the living room and the master bedroom. The router sits in that ...
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How to duplicate a tag in Signal Data Hub

I have a couple of tags setup in Signal Data Hub and I would like to know, if it is possible to duplicate these tags. Meaning, I want to keep everything about the tags the same except how they are ...
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How do I find the SNR of an ethernet connection?

iwconfig reports the signal-to-noise ratio (SNR) of wireless connections, but how do I find the SNR for an ethernet connection? ifconfig does not report it.
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ASCII code for Win+R

Is it possible to "emulate" the keystroke Win+R (or more generally speaking: any combination with Win key) with an ASCII code? It is possible to send Ctrl+Something as an ASCII code, so I wonder ...
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No HDMI signal with i3 + Denon amp

My setup used to worked perfectly : Windows 10 + i3 4330 --HDMI--> Denon amplifier --HDMI--> Samsung TV One day, I got a power outage. But once it went back, my HTPC stopped sending signal to my ...
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How to know if I have this signals in my area?

How to know if I have this signals in my area? GSM, GPRS, EDGE, 3G, 4G, HSDPA, HSPA+ and LTE I don't have any smartphone but I have a laptop.
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Why does the monitor lose signal when I turn off/on my monitor on Windows 7?

Ever since I installed Windows 7 on my machine, my monitor has been acting strangely. When I boot my machine, my monitor starts up and receives signals fine. However, no matter what if I decide to ...
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1 answer
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Why screen no signal only on first boot? how to fix?

Every day is the same. I arrive to the room, I turn on the PC, screen no signal. If I shut down the PC and boot again, the signal recovers, until the next boot hours later. I've had this problem for ...
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2 votes
0 answers
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Monitor displays "no signal detected" message

I recently bought a new monitor but when I connect it to my PC I only get a "no signal detected" message. The monitor works fine when I connect it to my laptop, and my PC also works otherwise. I tried ...
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1 vote
2 answers
2k views

How do I connect a computer far away from the monitor?

I have an architectural practise where we use relatively powerful computers that are difficult to replicate on lap tops. Flexibility in the office is key, so I was wondering if it is possible to place ...
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Intel integrated audio signal path

I have a Dell Latitude C840 laptop. It has Intel Integrated Audio. Intel 82801 CA/CAM AC'97 Audio Controller. It has been giving me problems. Sometimes I get chopped or truncated audio, or strange ...
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Can I use a router to distribute an internet connection from a laptop?

I want to take the signal from one router, using a laptop. From this laptop, send it to another router, and distribute the aforementioned signal throughout another wireless network. I even have a ...
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