Linux-audio-user February 2006

linux-audio-user@lists.linuxaudio.org

207 participants
268 discussions

[linux-audio-user] jack trouble with mandriva2006

by emanuele ..:: www.rumoridifondo.com ::..

if i start jack bye qjackctl from normal user i receive this errors: JACK: unable to mlock() port buffers: Cannot allocate memory cannot use real-time scheduling (FIFO at priority 10) [for thread -1236161616, from thread -1236161616] (1: Operation not permitted) cannot use real-time scheduling (FIFO at priority 20) [for thread -1227768912, from thread -1227768912] (1: Operation not permitted the jack server starts, but then it tell me messages like this "**** alsa_pcm: xrun of at least 8.570 msec" no problem if i run qjackctl from root. there's something to fix in my configuration? thank you all. bye bobo

18 years, 10 months

[linux-audio-user] Some various questions about system configuration..

by Dana Olson

I am still new to a lot of this stuff, and I searched back a bit through the archives (manually, as I don't know of a search functionality) to see if there was any discussion about it. First question, /proc/sys/vm/swappiness. Is there an advantage to setting this to anything than the default for my distribution, which is 60? I have heard that settings of either 100 or 0 are good for different reasons, but strictly thinking in terms of using my system for music production, what would you recommend? Second question, elevator=cfq. I am thinking that CFQ is not good for music purposes. Would that be correct? I've read it speeds up general desktop usage, but this might work against realtime-preemption, wouldn't it? Third question, ReiserFS vs Ext3 vs XFS vs JFS etc. Is there a filesystem that should or shouldn't be used with realtime-preemption? Fourth question, CONFIG_DEBUG_DEADLOCKS. DeMuDi has it enabled, but it gives a warning when you boot up that it could introduce higher latencies. Is it safe to turn off? I'm sorry if these have been asked before, but I didn't see anything. If you want to just link me, that's fine, I checked on Google and got conflicting results, and not a lot specific to music production. Thanks in advance. Dana

18 years, 10 months

[linux-audio-user] Request for help

by Lee Revell

James Courtier-Dutton, who wrote the ALSA snd-ca0106 driver, got the Audigy 2 ZS PCMCIA working on Linux, and has contributed lots of other code to ALSA, recently lost all his Linux machines to a power surge. He estimates this will set his work on ALSA back 3-6 months. I think it would be great if anyone who finds his code useful would make a PayPal donation to help replace the lost hardware, to james(a)superbug.co.uk. Thanks, Lee

18 years, 10 months

[linux-audio-user] OT - Power Amp?

by Kevin Cosgrove

I could ask this question a number of places, but I like you folks. :^) I'm in the market for a ~400W/ch @ 8 Ohms amp to replace my aged, and now broken for the 4th or 5th time, JBL power amp. I've got some experience with QSC amps in band practice settings, and in live performance settings. All I can say is that they never seem to be problematic, and always seem to do their job. I haven't used one in a studio setting. I'd almost just go buy a QSC today, unless someone here would warn me off. I do need an amp quickly as I was just about to mix some ardour recorded music. What advice do you people have? Thanks.... -- Kevin

18 years, 10 months

[linux-audio-user] Need for more than stereo

by leslie.polzer＠gmx.net

Hello audio users, I'm working on JACK Rack 2 and would like to know how many of you are using more than two channels and how important you consider more than two. Thanks, Leslie -- gpg --keyserver pgp.mit.edu --recv-keys 0x52D70289

18 years, 10 months

Re: [linux-audio-user] Re: Need for JACK Rack (2)?

by Kjetil S. Matheussen

Loki Davison: > > On 2/6/06, leslie.polzer(a)gmx.net <leslie.polzer(a)gmx.net> wrote: >> >> Hello Loki, >> >> On Mon, Feb 06, 2006 at 10:11:58AM +1100, Loki Davison wrote: >> >>> As i said originally, om is big and powerful with it's standard gui. >>> The engine however is very light weight >> >> Also in terms of dependencies? >> >>> if it were lighter than jack rack and more stable. >> >> Don't forget that we are talking about a complete rewrite of JACK Rack 1 >> (which is quite stable in its own right). >> >> Leslie >> >> -- >> gpg --keyserver pgp.mit.edu --recv-keys 0x52D70289 >> http://nic-nac-project.de/~skypher/ >> >> > >> From the om site. > > The Om engine (which can be built by itself) requires: > Liblo 0.22 and above > Jack 0.99 and above. > And can optionally use: > Alsa sequencer > DSSI > LADSPA > > It would also be great for overworked Dave to get some help ;-) > Sorry, thats not the complete truth. It also requires: Gtkmm 2.4 and above. LibGlademm 2.4 and above. FlowCanvas ...which is only available on newer linux distributions. I once tried to compile up gtk 2.4, but I was unable because my glibc was too old. I only have rh8, and I don't think thats very uncommon. Om has to work with older versions of gtk to get more users. Until then, I don't think this software has really come out of the beta-stage yet.

18 years, 10 months

[linux-audio-user] Ubuntustudio + ACPI + Jack issues

by Johannes Mario Ringheim

Hi all, I've just installed Ubuntustudio. It all works great, except after a few minutes I get lots of these message from jack: "delay of 27893.000 usecs exceeds estimated spare time of 21274.000; restart ..." (where the number of usecs are varying). After lots of fiddling and googling I discovered that acpi is probably causing it, and it consequently happens only when acpi is enabled. When acpi is disabled I can push latency down to 2.67 msecs without xrunning nomatter how hard I try....so this is good ;) I've done these tweakings with Breezy, and it happens with all of them: http://ubuntustudio.com/wiki/index.php/Breezy:Vanilla_Kernel_With_Realtime_… http://ubuntustudio.com/wiki/index.php/Breezy:Rlimits-Aware_PAM http://ubuntustudio.com/wiki/index.php/Breezy:Enabling_Preemption It also happened the same way in out-of-the-box Dapper. I'm now on Breezy with the vanilla kernel with preempt patch. My laptop is a Dell Inspiron 8600: http://www.koeniglich.de/dell_8600.html I use Alsa intel8x0 driver, and had no other problems. Jack also worked fine with acpi on other distros like PCLinuxOS, even with the non-mm kernel. I have no idea what to do next, if anyone could give me a clue it'd be appreciated. -- Ringheims Auto - Fri musikk for bilstereo! http://ringheimsauto.1go.dk/

18 years, 10 months

[linux-audio-user] JACK ports

by Ruben Lopez

In JACK, if the number of Maximum Ports is increased, does JACK use more system resources? If not, is there a down side to having a high number of ports? Ruben

18 years, 10 months

[linux-audio-user] RE: RTC !??

by David Baron

>This has been in my /etc/modules from the start. For a while now, (most >recent?) 2.6 kernels, this will not load "device not found". Since it did not >seem to effect anything, I just let it be. (Note I have both a rtc.ko and >rtcgen.ko in my kernel's modules.) >Finally, an app kicked! Playing with the latest Dynebolic 1.4.1 running in >Qemu (1.1 ran very nicely without complaint), I got a non-fatal error message >unable to set rtc to some parameter 1024. It suggested running in a 2.6 host >kernel (2.6.15 at your service!) or echoing 1024 into a file on some /proc >subdirectory (I have no such subdirectory in /proc). More ... I started /etc/module-ing rtc for use with lmsensors. The kernel config file lists this as a "USB watchdog card". Maybe just because it is listed in this group. Genrtc is a "generic" rtc driver for one who lacks this hardware capability. As rtc used to work (or at least modprobe), I apparently have it. Saw something interestic in my logchecks: kernel: Generic RTD Driver v1.07 If I take this one off, the "real" one will modprobe :-) Question is, who is loading genrtc BEFORE /etc/modules gets referenced? Actually, I tried commenting it there and ... the error message remains so something, somewhere is trying to load BOTH of them! Anyone know anything about this?

18 years, 10 months

[linux-audio-user] Installing Demudi packages on Debian

by brent＠keycorner.org

It's occured to me that installing the kernel from Demudi stable on Debian might be a nice easy way to get all my kernel tweaks without even needing to recompile. And thanks to the way the kernel and the userland in Linux are so relatively version independant of one another (something not so true on other UNIX flavors), that should be quite safe, too. It made me wonder though -- since Demudi is built from Debian, what would be the issues with inporting lots of other packages useful to musicians as well, while still keeping the system essentially Debian? Do a lot ("a lot" meaning a destabilizing amount) of non-music-related packages from Debian get superceded by Demudi versions when you add the Demudi Apt repositories to the sources.list of a sarge machine? Are any of you currently doing something like that? Just wondering... I'm sure that even as there have been many MIDI and recording apps in sarge that surely would not have gotten there without Demudi, there are probably still others that either never made it or have newer versions in Demudi than what sarge gives you. I just don't want to make my system unmaintainable by mixing distributions like that on a really massive scale though... Once you get newer versions of really critical things, it can be almost like committing yourself to running sid/unstable -- no easy way back. -- + Brent A. Busby, UNIX Systems Admin + "It's like being + + James Franck / Enrico Fermi Institute + blindsided by a + + The University of Chicago + flying dwarf..." +

18 years, 10 months

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Linux-audio-user February 2006