2010/10/14 Valentine Sinitsyn <valentine.sinitsyn@xxxxxxxxx> > Hi David, > > First of all, thank you for your work on subwoofer issues. it seem that acer aspire 8943g has 5.1 speakers according to acer web site with five built-in speakers and one subwoofer supporting low-frequency effects https://bugtrack.alsa-project.org/alsa-bug/view.php?id=5083 alc670 is a 6 channels codec with [Audio Output] at nodes 0x02, 0x03 and 0x04 http://www.alsa-project.org/db/?f=d1c9aaa11903b6b1e2fd87b6d0466157ffdcb6ad Seem that your Lenovo are not using ALC670, > Nope it doesn't. It is Lenovo Y550P with ALC272, and in my system, the subwoofer is connected at pin 0x17. I'm not at it at the moment, but I can send alsa-info.sh later if it is of any interest. ALC272 is just a four channels codec , If you look at the block diagram (page 5) of alc272 datasheet , the mono-out (Port H) pin 0x17 has no volume control , and it is connected through 0x0f to [Audio Output] node 0x02. This is quite different from STAC9200 which has a volume control for the mono-out widget The beep-in and the beep generator can connected to 0x0f through [Audio Mixer] 0x0b this mean that the driver cannot assume that master-mono must be connected to a subwoofer. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
