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Questions tagged [realtime]

Related to the use of Ubuntu as a real-time OS, whether through use of a patch, replacement kernel or other method. This is often desired in the context of industries such as automation and CNC machines, as well as certain audio applications. Questions may relate to specific real-time patches/...

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(initramfs) /cow format specified as aufs and no support found

I added a Real-Time patch to my existing Ubuntu 14.04 kernel to make it soft RT Linux. I've the steps for RT Linux here https://stackoverflow.com/questions/51669724/install-rt-linux-patch-for-ubuntu ...
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0answers
42 views

Why is the canary starving? [duplicate]

I'm running Kubuntu 14.04 and my machine is nearly locked up. I apparently have a canary problem. Here is the log just before the bird started chirping: May 10 21:38:06 Morchella NetworkManager[1010]...
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1answer
333 views

Making Liquorix default kernel with native NVIDIA drivers for Ubuntu 16.04 for enhanced gaming and realtime functionality

I've been interested in running the Liquorix kernel for gaming and realtime performance enhancements. It's a pretty straight foward installation, but I found that it was incompatible with NVIDIA ...
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0answers
36 views

Ubuntu mate 16.04 RTC 1307 gets configured but when reboot time is not working

Ubuntu mate 16.04 RTC (1307) gets configured when connected to Internet.After configuration i have disconnected the Internet and restarted the Raspberry pi-3.After restarting the time is going wrong, ...
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1answer
975 views

Low Latency Kernel Downsides? [duplicate]

I'm considering moving from stock Ubuntu to Ubuntu Studio. My only concern is the low latency kernel. I've looked into what exactly it is, and know it will be great for my audio work, but I am ...
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1answer
1k views

Problem with real-time clock since upgrading to Ubuntu 17.10

SEE UPDATES BELOW I recently upgraded from Ubuntu 17.04 to Ubuntu 17.10 using the software update process. The update completed without any errors, and Ubuntu 17.10 is now running without any major ...
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0answers
186 views

Built PREEMPT-RT kernel - 'Failed to start Load Kernel Modules'

So I built my first custom kernel. Started with 4.8.15 then applied the 4.8.15 PREEMPT patch, mainly following these instructions. Only mentionable deviation was in the .config file for the build I ...
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0answers
106 views

Ubuntu 14.04 login loop error during RTAI Linux installation (problem by EFLTK?)

I am going to install RTAI Linux with RTAI-lab modules for MATLAB/SIMULINK in order to create a hard real time environment for digital control application. I have searched for several RTAI ...
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0answers
83 views

How to use wine-rt to record e-drum into Ardour 5 (on realtime)?

How can I use wine-rt to record Addictive Drums 2, using my e-drumset (roland td4 kx2) into Ardour 5, on realtime? As it is now, I can't get a proper latency (it flows), and I get constant glitches ...
0
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1answer
227 views

Realtime equalizer?

What realtime equalizers are there that work with JACK? I have heard of Calf Studio Gear, but not sure if it will work or how good it is. Ones that won't work are: pulseaudio-equalizer, jackeq, jamin....
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0answers
134 views

How to integrate Xenomai 3 with Nvidia cuda?

I use Ubuntu 16.04.2 64bits. I heard that Xenomai 2.x/3.x could not support Nvidia CUDA drivers. Is that true? If yes, how to solve it? Is there exist any software that can allocate one CPU ...
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2answers
15k views

timedatectl- NTP Sync cannot set to yes

I tried so much different things of installing ntpq or other stuff but nothing works. I dont can change it to yes. I hope someone can help here. I had Ubuntu 16.04 This is my terminal output of the ...
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0answers
497 views

Does Ubuntu Core support real-time?

Does Ubuntu Core's kernel support (hard) real-time? If not, is it using a standard kernel, which can be patched with the CONFIG_PREEMPT_RT set?
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1answer
242 views

ulimit: Unknown option “-r”

I'm trying to get JACK running in RT mode and I need to determine whether I'm allowed the necessary real time priority. Around the internet I found that ulimit -r or more genreally ulimit -a can tell ...
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1answer
585 views

JACK cannot start in realtime mode despite membership in audio group

My jack server is unable to start in realtime mode despite me being in the audio group. This is my setup: zegkljan@eddie:~$ lsb_release -r Release: 16.10 zegkljan@eddie:~$ echo $USER zegkljan ...
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1answer
417 views

How to install realtime kernel on Ubuntu Live USB

I am using Ubuntu Live USB stick 16.04.1 with boot toram and persistence option. So far best sounding setup for audio streaming (Firefox+AdobeFlash+Tidal). It is also best setup in terms of usability ...
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1answer
200 views

Question about the RTAI and version Of kernel

I have a ubuntu 3.8.0-29 geniric and the gcc 4.6.3 . I will to install the RTAI , what is the version of kernel and the version of kernel to download ?
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1answer
718 views

How install Real Time Application Interface (RTAI) in ubuntu 14.04

I have Ubuntu 14.04 and I want to install rtai , my version kernel is : 3.16.0-30-generic. How to install the Real Time Application Interface Rtai of kernel 3.16.0-30-generic?
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1answer
187 views

Problems compiling a kernel (3.4.110) on xubuntu 15.10

I am not sure if i am in the right forum for this, because it's more of a debian/kernel thing, but it is worth a try. I have to set up a linux system to work with EtherCAT ( for a machine control ). ...
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1answer
243 views

Hard disk's too slow to play a huge raw AVI file

I have a huge AVI file. The video player (VLC) stops every about 10 seconds because the HDD doesn't read fast enough. (details here) I want to be able to play this video. Anyone knows a workaround? ...
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1answer
557 views

VLC can't play large raw avi 1080p video

I recorded a huge raw avi video using SimpleScreenRecorder but it can't be played smoothly. Every about 10 seconds the video stops to render. How can I avoid this. I don't think my computer can't ...
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1answer
3k views

How to get to a perfect jackd configuration that works trouble-free and out of the box?

While working on a PPA to provide binaries for Sonic Pi, the users of the PPA binaries keep stumbling over jackd. How to make things easier for them? Sonic Pi is an educational music tool that ...
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1answer
129 views

How to get debuginfo package for -rt kernel

I have Ubuntu 14.04 with 3.14.3-rt4 kernel. I have to use SystemTaptool and I must have debug symbols to use it. I follow the instruction in here but there are no debug symbols for my kernel and when ...
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1answer
6k views

What is clamd's function?

I understand that there is currently no real-time AV for Linux, or at least not using ClamAV. So what is clamd's function then? Because that talks about on-access scanning, so what is that if not real-...
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0answers
61 views

Control Alsa in real time with external controller?

Okay so after hunting down old threads and questions, I feel it's best to just ask this and see if I can get some help. My question is how in the world do I control Alsa externally with my Korg micro ...
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1answer
24 views

Mixed criticality system based on Ubuntu

Is there a way to implement a mixed criticality system based on Ubuntu? I.e. if we have some software module that is complex and non-critical and we want to develop it as usual on Ubuntu. And we have ...
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1answer
647 views

Conky - Command Output Display Limited to 256 Bytes 'tail -n20 logfile.txt'

I am trying to display the contents of a large log file on the desktop using conky. I would like the 'window' to occupy the upper half of the desktop, and show the 20 most recent lines. I use the ...
2
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1answer
2k views

Start jackd with realtime priority with upstart

I'm trying to start jackd with realtime priority at boot with an uptstart script but with no success so far. I'm using ubuntu server 14.04. My upstart version is 1.12.1. The user and group I'm using ...
2
votes
1answer
511 views

How to disable Lazy Preempt in kernel

I'm relatively new to Linux and working on getting a real-time kernel up and running for robot applications. I'm on Ubuntu 14.04, using kernel 3.14.3 and the 3.14.3-rt5 real-time patch. Also using x86-...
2
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1answer
4k views

A2DP on PulseAudio - terrible choppy/skipping audio

I have paired my Bluetooth headset with my Ubuntu 12.04 laptop with a Bluetooth chip inside: lsusb | grep Bluetooth Bus 003 Device 003: ID 045e:0745 Microsoft Corp. Nano Transceiver v1.0 for ...
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0answers
2k views

“ERROR: Kernel configuration is invalid”

I have been stuck on this issue for two days now and couldnt find a fix for this. I installed a realtime kernel with sudo apt-get install linux-rt because KauNet (which is an ipfw extension) ...
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1answer
3k views

VisualBoyAdvance Battery Has Run Dry

I recently downloaded VBA and Pokemon Emerald. The game says "The Internal Battery has run dry" I've been told to go to Options>Emulator>Real Time Clock, but there is no clock! I have checked ...
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1answer
213 views

Multiple kernels choices realtime or no realtime

I have a dell latitude d510 currently running xubuntu 13.04 and linux 3.8. I want this machine to host JACK processes together with EDIROL UA-25 during a live session and therefore, it needs an RT ...
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2answers
1k views

What is the purpose of the RTAI package in Ubuntu

RTAI (Realtime Application Interface) is a Linux kernel patch, that exposes an API to userland processes, which can be used to create very low latency and jitter programs for realtime tasks. I've ...
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1answer
3k views

Ubuntu can be used as Hard Real time OS? [duplicate]

I want OS for Beagleboard which can support HARD REAL TIME OS Feature. is Ubuntu HARD Real time OS ?
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0answers
1k views

How do I install a real-time kernel with a patch I need to apply? [closed]

I have ubuntu 12.04 with kernel 3.5. I have to install the RT_PREEMPT patch and I followed these steps: sudo apt-get install kernel-package fakeroot build-essential libncurses5-dev mkdir -p ~/tmp/...
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6answers
1k views

how to update dolphin file manager in real time

If I have dolphin open and I'm working in the terminal or on Windows files might be moved or added. How would I go about to make sure it updates the status of a directory of real time? Presently I ...
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2answers
672 views

Is it possible to direct system monitor output to a file?

I want to save to a text file the CPU and memory usage real-time info displayed in Gnome System Monitor 3.6. Does anybody know if this is possible? If so, how can it be done? If it's not possible with ...
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1answer
1k views

Automatically mirror a directory in Ubuntu

Running Ubuntu 12.04 I have a library of personal files and documents stored in Dropbox. I want the Dropbox folder to be automatically mirrored to a directory in the local machine, as a backup to the ...
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1answer
2k views

How to see real time updates of file system at terminal?

I am studying git and how it works with file system. I installed application called terminator, which allows me to open multiple terminals. I want to run git commands at the left terminal and want to ...
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2answers
2k views

12.04 Ubuntu studio PREEMPT_RT kernel options

My audio processing needs require a preempt_rt kernel. I roughly followed the guide: https://wiki.ubuntu.com/KernelTeam/GitKernelBuild with a little help from: https://rt.wiki.kernel.org/index.php/...
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1answer
391 views

How to install backported programms?

How to get backported kernel and nautilus? im on 10.04 i want fixes witch are made in 12.04 how to get them? im beeing told about installing backported kernel. On 10.04 i have some bugs witch been ...
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3answers
201 views

What can I do about the fglrx driver interfering with jackd?

The jack-audio-connection-kit needs to run in realtime mode and my system is configured accordingly. I'm using the fglxr driver. With Unity-2d everything is fine. With Unity-3d, jack-clients ...
7
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1answer
4k views

Using the RandR-enabled nvidia 302.xx beta driver in 12.04 with a realtime kernel

How can I use the recent beta of the 302 version of the nvidia driver (which finally supports the RandR extension!) with a realtime kernel in Precise? This question contains information on enabling ...
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4answers
55k views

How can I install a realtime kernel?

I have read a lot of threads with similar questions, but after reading the answers, I am very confused. I have found in them lots of url's with repositories but people discusses about which ...
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1answer
1k views

Is RTLinux the same as linux-rt?

I'm trying to install a hard realtime kernel in Lucid for some robotics work. My preference is RTLinux (http://rtlinuxfree.com) by Wind River Systems. I also see that there is a package by the name "...
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1answer
2k views

Can I install rtlinux?

How do I install rtlinux in Ubuntu? If I get it to install will it make software work abnormally?
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2answers
6k views

Can it be harmful to grant jackd realtime priority?

I am apt-get installing Ardour, a sound mixing program, just to try it out. Installing Ardour also installs JACK, a dependency. As part of the JACK installation script, I get the following dialog: ...
2
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1answer
1k views

Realtime kernel running as virtual machine

I read that using a Linux kernel (Ubuntu rt kernel) was able to increase the response time of a Java application by 4x. My only problem is that I must run a program that only has a Windows ...
3
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1answer
982 views

Reducing audio delay from redirecting input to output

I tried using the solution presented in a related question for redirecting my audio input to my output, but the problem is that there's a very noticeable lag. It's especially obvious to me because I ...