Some of the goals of the ALSA project at its inception were automatic configuration of sound-card hardware and graceful handling of multiple sound devices in a system. It started in and was developed separately from the Linux kernel until it was introduced in the 2. In the 2. While ALSA may be configured to provide an OSS emulation layer, such functionality is no longer available or is not installed by default in many Linux distributions. Besides the sound device drivers, ALSA bundles a user-space library for application developers who want to use driver features through an interface that is higher-level than the interface provided for direct interaction with the kernel drivers.
Unlike the kernel API, which tries to reflect the capabilities of the hardware directly, ALSA's user-space library presents an abstraction that remains as standardized as possible across disparate underlying hardware elements. This goal is achieved in part by using software plug-ins ; for example, many modern sound cards or built-in sound chips do not have a "master volume" control. Instead, for these devices, the user space library provides a software volume control using the " softvol " plug-in, and ordinary application software need not care whether such a control is implemented by underlying hardware or software emulation of such underlying hardware.
This section provides an overview of basic concepts pertaining to ALSA. Typically, ALSA supports up to eight cardsnumbered 0 through 7; each card is a physical or logical kernel device capable of input and output. Furthermore, each card may also be addressed by its idwhich is an explanatory string such as " Headset " or " ICH9 ". A card has devicesnumbered starting at 0; a device may be of playback type, meaning it outputs sound from the computer, or some other type such as capturecontroltimeror sequencer  ; device number 0 is used by default when no particular device is specified.
A device may have subdevicesnumbered starting at 0; a subdevice represents some relevant sound endpoint for the device, such as a speaker pair. A card's interface is a description of an ALSA protocol for accessing the card; possible interfaces include: hwplughwdefaultand plug:dmix.
The hw interface provides direct access to the kernel device, but no software mixing or stream adaptation support. The plughw and default enable sound output where the hw interface would produce an error. An application typically describes sound output by combining all of the aforementioned specifications together in a device string [ citation needed ]which has one of the following forms which are case-sensitive :. An ALSA stream is a data flow representing sound; the most common stream format is PCM that must be produced in such a way as to match the characteristics or parameters of the hardware, including:.
It only takes a minute to sign up. I woud like to set up the default sound volume once for all, for all ALSA devices that will be connected ever. Of course, I could do amixer But I really want to modify the default volume even for future soundcards that will be added later. What I want is a solution that will apply to any soundcard that will be connected.
Context : why do I want this? I'm providing a ready-to-use Debian image for my project SamplerBox. I would like to provide a default -3dB volume that will work for any ALSA soundcard people could have Note: I reinstalled a fresh new system and it seems that, by default, the volume is dB for all devices :.
For some reason, ALSA seems to ignore the ppercent and pvolume settings on my system, but from your comments it seems like they worked for you. If anyone can enlighten me on why the configuration might be ignored, I'd be glad to amend this answer. I just wandered upon this post and see you are struggling with the answer to this as I was.
This is what fixed it for me:. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 4 years, 10 months ago. Active 11 months ago. Viewed 18k times. In which config file should I set this default sound volume?Slushpool instructions
Basj Basj 1, 3 3 gold badges 18 18 silver badges 48 48 bronze badges. Hum this is strange n. Do you see then how we could deal with that?
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On all devices I have tested! Active Oldest Votes. I seem to be having the same issue.There are three different views: Playback defaultCapture and All. Press F4 to switch to Capture mode. Press F3 to switch to Playback mode. Be aware that All mode may not show all of the capture devices for your card, but Capture mode should. It supports multiple soundcards with multiple devices.
It supports several cards and several interfaces per card? Select the card to manage, if you have of them more one. The cards are numbered from 0 card 0 is used by default. Select the interface of the card to manage, if your card has more than one. The interfaces are numbered from 0 interface 0 is used by default. Don't confuse channels of the card with interfaces of a card.
Channels are sometimes named like "interface". The majority of the cards have only one interface. More advanced cards can have have several interfaces. This option corresponds to the option - D for amixerarecordand aplay. Start in "exact mode". That modifies the representation? By default the sound levels are shown in percentages It is easy to read, but does not show you how the card stores sound levels. In exact mode, you see the sound levels in the same way that the card stores them.
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It only takes a minute to sign up. I've tried do undo this but not able to get it disabled. My sound settings need to be redone every boot up as well, but asking that question as well would get neg. How to get microphone to work on acer aspire one Howto save AlsaMixer settings? For me, the method pertaining to disabling Auto-Mute mode in alsamixer or gnome-alsamixer didn't work.
In my case, I had the problem that plugging headphones in would switch the speaker sound to zero as well as mute it which is correct and should definitely happen ; and when you disconnect the headphones, the headphones would be muted. Moreover, the speaker volume after connecting and disconnecting headphone wasn't getting saved.
For analog-output-speaker. For analog-output-headphones. I couldn't get the mute-on-activation to work on connection of headphones so that it temporarily mutes the headphones while the 3. I'd update the answer accordingly if anyone comments with a way to do so.
Ubuntu Community Ask! Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Alsamixer: howto disable auto-mute mode Ask Question. Asked 7 years, 11 months ago. Active 9 days ago. Viewed 15k times. David Foerster Active Oldest Votes.
This fixed my sound problems with Ubuntu I think it should be noted that you may have to scroll to the right to view if Terminal is not maximized the auto-mute option. I was scratching my head for a bit Thanks, it worked! I am using Ubuntu ALSA has the following significant features:. Please, help us to provide better content and organisation on this wiki.
Read the Community Portal for more details. We need users to use, test and provide feedback on drivers and applications using ALSA. If you are interested, please subscribe to a mailing list. We need application developers who choose to use ALSA as the basis for their programs, programmers to work on low level drivers, writers to extend and improve our documentation. Jump to: navigationsearch. Current versions stable linux kernel linux firmware files GIT alsa-firmware Namespaces Page Discussion.
Views Read View source View history. Download a package Current versions stable linux kernel linux firmware files GIT alsa-firmware Is my soundcard supported? How do I test my soundcard? Other information Unofficial wiki. Alsa Project News ALSA Developers We need application developers who choose to use ALSA as the basis for their programs, programmers to work on low level drivers, writers to extend and improve our documentation.To choose the right driver, first detect the used audio controller.
Use lspci for this task:. The lsmod command can be helpful.How To Fix No Sound in Linux Using Alsamixer
It is a good idea to merge the package if it is not already installed:. This file can be optionally used so that on a per-user basis, ALSA defaults can be overridden. If the system has special hardware it is likely the card 0 and device 0 the defaults are not going to work. One of the simplest changes is card and device.
If you can't seem to find the card number assigned to the device that is the sound card you intend to use, don't panic — the card number is internally a name, which you can use. If your card is listed like this When multiple sound cards are in use, the device numbers could be reordered across boots, such that using a name is advantageous.
Any of these are valid names for the card.Stunnel auto start
While only some applications, such as the Web browser Flash plugin will fail playing sound. As such, the below. Also, any media applications open will need to be restarted for the. Web browser with Flash plugin. Basic Analog ie. RCA Connections - Basic user.
Quality depends on sound card DAC. Look for a sound card with a high SNR db level. Again, the basic user will likely just use HDMI, avoiding the fuss of changing configuration files around. To my ears, the high bitrate compressed media has little loss in comparison to two channel CD or DVD audio. I surmise this is because we now have multichannels feeding multiple speakers.Bangla sex cenama parin
Hence, the more hardware, the equivelant or better sounding? This is because, when they do list Dolby or DTS, it's because they're providing software for upmixing, or providing the decoded signal through analog output.
In comparison to DVD video and audio, I see and hear very little quality difference, if any! I conclude this is because of the higher bitrate? Decoding or encoding to Dolby or DTS requires a license. If you have already purchased a sound card with this multichannel support, then you likely already have a license.
See this article for more informations. Recompile mplayer or another other favorite software player to include the ALSA libraries. Add the multichannel codecs to mplayer.Ubuntu Forums Code of Conduct. Results 1 to 10 of August 20th, 1. How to install ALSA? I've been having a ton of problems ever since upgrading to Hardy and I've already done two fresh installs! I do have sound, and I'm not exactly sure how all this works but I believe I've got Pulseaudio installed as well.
I'm not sure what information I can give you to make it clearer how exactly I can fix this! Here are some things which may or may not help: Code:. Adv Reply. August 20th, 2. Join Date Mar Beans Alsa is installed by default in Ubuntu so there is no reason to install it from source. To open the alsa control panel for adjusting volume here is the command. August 21st, 3.
Here is what I get when I try to run "sudo alsamixer":. January 29th, 4.
Join Date Oct Beans 4. Hey, I'm not sure if this will help you or not, but here's what I did Open a terminal and enter: sudo apt-get install alsa to be sure that you have ALSA installed. Click the "Save" button. I had no sound when I started playing with Jaunty 9. I think this should work for Intrepid 8.
Good Luck! October 2nd, 5. Join Date Sep Beans October 3rd, 6. A lot of cat scratching here. Use the alsa-info-script to provide detailed information. Run this command in a terminal: Code:.
October 3rd, 7.
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