https://www.thinkwiki.org/w/api.php?action=feedcontributions&feedformat=atom&user=CctsurfThinkWiki - User contributions [en]2026-04-30T18:01:06ZUser contributionsMediaWiki 1.31.12https://www.thinkwiki.org/w/index.php?title=CS4299&diff=28993CS42992007-03-29T17:18:24Z<p>Cctsurf: /* Linux ALSA driver */</p>
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=== CS4299 ===<br />
This is a Cirrus Logic AC'97 Audio controller<br />
<br />
This chip is sometimes incorrectly called CS4229 in IBM documentation<br />
=== Features ===<br />
* Chipset: CS4299<br />
* Interface: AC'97 2.1<br />
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=== Linux OSS driver ===<br />
This sound chip is supported by the i810_audio kernel module.<br />
<br />
=== Linux ALSA driver ===<br />
This sound chip is supported by the snd-intel8x0 kernel module.<br />
<br />
=== T23 Fast Sound ===<br />
On at least one t23 (mine) the ALSA intel8x0 driver plays sound too fast. The following {{path|/etc/asound.conf}} restores normal operation: <br />
<br />
pcm.intel8x0-hw {<br />
type hw<br />
card 0<br />
}<br />
<br />
pcm.!default {<br />
type plug<br />
slave.pcm "intel8x0"<br />
}<br />
<br />
pcm.intel8x0 {<br />
type dmix<br />
ipc_key 1234<br />
slave {<br />
pcm "hw:0,0"<br />
period_time 0<br />
period_size 512<br />
buffer_size 4096<br />
rate 44100<br />
}<br />
}<br />
<br />
ctl.intel8x0-hw {<br />
type hw<br />
card 0<br />
}<br />
<br />
<br />
==== Dmixing ====<br />
The CS4299 is not capable of hardware mixing. This means that only one sound stream can be played at any time. <br />
You must get the software to do the mixing for it (this will load your CPU).<br />
The ALSA implementation of this is called DMIX. You can also run sound servers like ESD or ArtsD, but not all applications will use them.<br />
Recent ALSA distributions have dmixing setup and enabled by default. <br />
<br />
Otherwise just add the following to {{path|/etc/asound.conf}} :<br />
pcm.dsp0 {<br />
type plug<br />
slave.pcm dmix<br />
}<br />
# mixer0 can stay unchanged, because<br />
# it isn't used anyway, I guess ;)<br />
ctl.mixer0 {<br />
type hw<br />
card 0<br />
}<br />
<br />
Now the only problem is how to tell applications to use the DMIX channel instead of dsp0. Most applications work by specifying "dmix" as the device. For command line apps use "aoss". <br />
<br />
Hint: XMMS does not work well with dmix and the intel8x0. You will probably need to patch and recompile. <br />
<br />
See: [http://bugs.xmms.org/show_bug.cgi?id=1716 XMMS bug 1716], [http://bugs.xmms.org/show_bug.cgi?id=2009 XMMS bug 2009] and [http://bugs.xmms.org/show_bug.cgi?id=1991 XMMS bug 1991]<br />
<br />
You also need to disable mmap and increase the buffer and period time in the advanced options.<br />
<br />
=== ThinkPads this chip may be found in ===<br />
* {{A21e}}, {{A22e}}<br />
* {{A30}}, {{A30p}}<br />
* {{T23}}<br />
* {{X22}}, {{X23}}, {{X24}}<br />
* {{i1200}}, {{i1210}}, {{i1230}}, {{i1250}}, {{i1260}}<br />
* {{i1300}}, {{i1330}}, {{i1370}}<br />
<br />
[[Category:Components]]</div>Cctsurf