Difference between revisions of "Virtual ALSA"
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Note that I have a preference for OpenVZ over KVM when it can be used... because it's easier to use. So, this page will tend to focus on OpenVZ solutions. | Note that I have a preference for OpenVZ over KVM when it can be used... because it's easier to use. So, this page will tend to focus on OpenVZ solutions. | ||
| + | == Assessment == | ||
| + | https://github.com/silkentrance/openvz-openvz-2.6.32/blob/master/Documentation/sound/alsa/HD-Audio.txt | ||
| + | <pre> | ||
| + | alsa-info | ||
| + | ~~~~~~~~~ | ||
| + | The script `alsa-info.sh` is a very useful tool to gather the audio | ||
| + | device information. You can fetch the latest version from: | ||
| + | |||
| + | - http://www.alsa-project.org/alsa-info.sh | ||
| + | |||
| + | Run this script as root, and it will gather the important information | ||
| + | such as the module lists, module parameters, proc file contents | ||
| + | including the codec proc files, mixer outputs and the control | ||
| + | elements. As default, it will store the information onto a web server | ||
| + | on alsa-project.org. But, if you send a bug report, it'd be better to | ||
| + | run with `--no-upload` option, and attach the generated file. | ||
| + | </pre> | ||
== ALSA Dummy Driver == | == ALSA Dummy Driver == | ||
| Line 20: | Line 37: | ||
Problem: debian VM doesn't have it. Document load procedure. | Problem: debian VM doesn't have it. Document load procedure. | ||
| + | |||
| + | Additional problem: even if it's there, third party VPS vendors don't place the support files necessary to see it on their boxen (example: creek). | ||
| + | |||
| + | As a reference, Virtual Box doesn't do that, and so may provide a model in some respects: | ||
| + | |||
| + | <pre> | ||
| + | VBX:~$ modinfo soundcore | ||
| + | filename: /lib/modules/3.2.0-55-generic/kernel/sound/soundcore.ko | ||
| + | alias: char-major-14-* | ||
| + | license: GPL | ||
| + | author: Alan Cox | ||
| + | description: Core sound module | ||
| + | srcversion: 4DECB476393C345C541D37D | ||
| + | depends: | ||
| + | intree: Y | ||
| + | vermagic: 3.2.0-55-generic SMP mod_unload modversions 686 | ||
| + | parm: preclaim_oss:int | ||
| + | </pre> | ||
* See also: http://superuser.com/questions/344760/how-to-create-a-dummy-sound-card-device-in-linux-server | * See also: http://superuser.com/questions/344760/how-to-create-a-dummy-sound-card-device-in-linux-server | ||
| − | If this command returns that you have this module, then you don't need to recompile your kernel. | + | If this command returns that you have this module, then you don't need to recompile your kernel. |
| + | |||
| + | In VBX the module loads no problem: | ||
| + | <pre> | ||
| + | # modprobe snd-dummy (note hyphen, not underscore!) | ||
| + | # | ||
| + | </pre> | ||
== ALSA on OpenVZ == | == ALSA on OpenVZ == | ||
The best article I've found to-date is cached here from http://myatus.com/p/x-server-with-sound-inside-an-openvz-proxmox-container/ circa 12/5/2013. | The best article I've found to-date is cached here from http://myatus.com/p/x-server-with-sound-inside-an-openvz-proxmox-container/ circa 12/5/2013. | ||
| + | === Notes on .114 Debian Slice === | ||
| + | |||
| + | Troubleshooting. Not to where snd_dummy can be installed yet. | ||
| + | http://ubuntuforums.org/showthread.php?t=205449 | ||
| + | |||
| + | * aplay -l - checks for 'soundcard' | ||
| + | * lspci -v - checks the hardware (useless in this case) | ||
| + | * modprobe snd- | ||
| + | |||
| + | <pre> | ||
| + | # modprobe snd- | ||
| + | WARNING: Deprecated config file /etc/modprobe.conf, all config files belong into /etc/modprobe.d/. | ||
| + | FATAL: Module snd_ not found. | ||
| + | # cd /etc | ||
| + | deb6:/etc# ls modprobe.conf | ||
| + | modprobe.conf | ||
| + | deb6:/etc# ls modprobe.d | ||
| + | aliases.conf alsa-base.conf fbdev-blacklist.conf | ||
| + | alsa-base-blacklist.conf blacklist.conf linux-sound-base_noOSS.conf | ||
| + | deb6:/etc# mv modprobe. | ||
| + | sudo apt-get --purge remove linux-sound-base alsa-base alsa-utils | ||
| + | sudo apt-get install linux-sound-base alsa-base alsa-utils | ||
| + | </pre> | ||
| + | |||
| + | Had to add packages: | ||
| + | * alsa-utils | ||
| + | * snd (was: soundcore on other distros) | ||
=== Preparing the host node === | === Preparing the host node === | ||
| Line 100: | Line 168: | ||
adduser skype audio | adduser skype audio | ||
</pre> | </pre> | ||
| + | |||
| + | == ALSA on KVM == | ||
| + | |||
| + | === Links === | ||
| + | http://www.linux-kvm.com/content/sound-problem-solved | ||
| + | |||
| + | == ALSA on CentOS VM Host Rack Box == | ||
| + | |||
| + | ALSA picks up the hardware on the base OS of this OpenVZ server. | ||
| + | |||
| + | Working out the process/problems to get the OpenVZ to work properly in progress. Updated OS & Kernel 2/25/2014. | ||
| + | |||
| + | == ALSA on Virtual Box == | ||
| + | It just works, but only the way it wants to. The Null device seems to have been loaded by default (Xubuntu 12.04). | ||
| + | |||
| + | === Links === | ||
| + | |||
| + | http://www.withoutthesarcasm.com/fixing-audio-in-linux-guests-virtualbox/ | ||
| + | |||
| + | == More How-To == | ||
| + | |||
| + | For post "install" (and debug) open the following doc, and scroll down to (or search for) "Using alsamixer" | ||
| + | |||
| + | http://ubuntuforums.org/showthread.php?t=205449 | ||
| + | |||
| + | = My Favorite Packages = | ||
| + | |||
| + | Tower load - moved to notes. | ||
