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| wiki:intel_hda_realtime_howto [2008/11/14 14:49] – formating holger | wiki:intel_hda_realtime_howto [2013/09/09 12:23] – [Debian (9 sept 2013)] bas_kooning | ||
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| [[http:// | [[http:// | ||
| - | ~~META: | + | ~~META: |
| - | ~~META: | + | ~~META: |
| - | ====== | + | ====== |
| - | + | ||
| - | ===== Introduction | + | |
| I've seen asked many times on the list how to get intel-hda cards working with low latency, in duplex operation. Here is a full, step by step, on how I got 4ms latency. I'm using a Dell M90 with a Quadro fx 1500, attached to a docking station with a Maudio Delta 66 pci card (secondary card) in it, the binary Nvidia drivers and Compiz. So if you were wondering, it is possible. :) | I've seen asked many times on the list how to get intel-hda cards working with low latency, in duplex operation. Here is a full, step by step, on how I got 4ms latency. I'm using a Dell M90 with a Quadro fx 1500, attached to a docking station with a Maudio Delta 66 pci card (secondary card) in it, the binary Nvidia drivers and Compiz. So if you were wondering, it is possible. :) | ||
| Line 12: | Line 10: | ||
| ===== Kernel ===== | ===== Kernel ===== | ||
| - | (i'm not going to walk you through how to compile a kernel) | + | (I'm not going to walk you through how to compile a kernel) |
| - | (the last kernel before the big kernel lock regression) | + | the last kernel before the big kernel lock regression |
| wget http:// | wget http:// | ||
| Line 21: | Line 19: | ||
| wget http:// | wget http:// | ||
| - | (if you don't see it here look in the projects/ | + | if you don't see it here look in the [[http:// |
| bzcat ../ | bzcat ../ | ||
| - | wget http://pastebin.com/ | + | Download this config: {{: |
| - | mv pastebin.php\? | + | |
| + | mv config-intel-hda.txt .config.old | ||
| make oldconfig | make oldconfig | ||
| - | (build and install your kernel) | + | build and install your kernel |
| ===== Module Options ===== | ===== Module Options ===== | ||
| Line 62: | Line 61: | ||
| * Periods/ | * Periods/ | ||
| + | ===== Debian (9 sept 2013) ===== | ||
| + | * Realtime does not have to be compiled anymore into the kernel: it is already by default. I know at least on " | ||
| + | * On Debian the location of the config file is **/ | ||
| + | * Further config files are located at **~/ | ||
| + | * The ' | ||
| + | * The ' | ||
| + | * Example of / | ||
| + | Use ' | ||
| + | pcm.!default { # declare the default PCM device | ||
| + | type asym # combine playback and capture devices | ||
| + | playback.pcm { ### Playback object ### | ||
| + | type plug # convert audio to mixer format | ||
| + | slave.pcm { | ||
| + | type dmix # mix multiple audio streams | ||
| + | ipc_key 69569 # shared memory key; must be unique, just make one up | ||
| + | ipc_key_add_uid true # add UID to shared mem key | ||
| + | ipc_perm 0600 # shared mem file permissions | ||
| + | slave { | ||
| + | pcm { | ||
| + | type hw # define the playback hardware | ||
| + | card " | ||
| + | device 1 # YOUR playback device on that card | ||
| + | } | ||
| + | format S32_LE | ||
| + | rate 48000 # YOUR samples per second | ||
| + | channels 2 # number of audio channels | ||
| + | } | ||
| + | } | ||
| + | } | ||
| + | capture.pcm { ### Capture object ### | ||
| + | type plug # convert audio format from the hardware | ||
| + | slave { | ||
| + | pcm { | ||
| + | type hw # define the capture hardware | ||
| + | card " | ||
| + | device 0 # YOUR capture device on that card | ||
| + | } | ||
| + | } | ||
| + | } | ||
| + | } | ||
| ===== Comments ===== | ===== Comments ===== | ||
| Line 69: | Line 108: | ||
| !-- Comments end here --! | !-- Comments end here --! | ||
| - | {{tag>intel-hda realtime | + | {{tag>Sound_Cards_and_Drivers |