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-   -   old alsa drivers with new libraries (https://www.linuxquestions.org/questions/linux-software-2/old-alsa-drivers-with-new-libraries-744039/)

epilitimus 07-30-2009 10:44 PM

old alsa drivers with new libraries
 
Does anyone know if new ALSA libraries can be used with older drivers?

This came up because I am upgrading my kernel from 2.6.27.7. I initially made the jump all the way to the newest stable kernel and discovered I had, among other things, lost sound. After much patching and compiling the problem with the sound system shows up at the 2.6.28 kernel boundary. After working through the ALSA troubleshooting page the only thing I can find is that the driver version is 1.0.18rc while my alsa library version is 1.0.17. So okay I need to try upgrading the library etc. When I went to the ALSA site the current version is 1.0.20. So I need to know if I can use that one or do I need to get the 1.0.8rc one and continue upgrading as I patch the kernel further.

Simon Bridge 07-30-2009 11:50 PM

Don't you usually get alsa with your kernel? Free software drivers usually come with the kernel.

Anyhoo - if you hand-compiled those drivers you use, you'll probably just need to recompile them against the new kernel.

epilitimus 07-31-2009 03:22 PM

Thanks for the reply.

Yes the driver does come with the kernel. Apparently the 2.6.27.x kernel uses the 1.0.17 driver and the 2.6.28 kernel uses the 1.0.18rc driver. So when I try to upgrade to the 2.6.28 kernel series I lose sound. The software behaves as if everything is cool but there is no sound. Neither aplay or KDE (which uses the OSS PCM interface) make any sounds at all.

After working through the troubleshooting page on the alsa-project.org website the library mismatch was the only thing I could find.

I need to upgrade the kernel for some other hardware issues unrelated to the sound system.

Simon Bridge 08-10-2009 12:48 AM

Right - so probably your best bet is to upgrade the kernel further in the hope its fixed in the next patch.
Check that the correct driver loads, and file a bug report against alsa. Post a link to the report here.


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