On Tue, 16 Feb 2010, Jaroslav Kysela wrote: > On Mon, 15 Feb 2010, Lennart Poettering wrote: > >> Heya, >> >> a while back I wrote a little tool "dbmeasure" which can be used to >> determine dB attenuation data for alsa mixer controls. I have now >> extended this little dB tools suite to include a tiny tool "dbverify" >> that can be used to verify the correctness of existing dB data exposed >> by the drivers. It should be relatively easy to use that tool, >> suitable even for non-guru folks who want to debug the dB information >> from alsa. >> >> http://git.0pointer.de/?p=dbmeasure.git >> git://git.0pointer.de/dbmeasure.git > > Thank you for this code. I'm playing with an idea to start gathering of all > ALSA tests around and make a GUI for them. But it might make sense to use > something more portable than C language and use standard ALSA tools (amixer, > aplay) as backends ;-) > > For USB cards, the dB ranges read from hw are not correct. We have to > overwrite these bad values in the driver. Unfortunately, the USB driver > doesn't show the USB descriptor -> ALSA control mapping to gather all > necessary information for the code updates. I'm working on a patch right now > to obtain this information using procfs. The patch is available here: http://git.alsa-project.org/?p=alsa-kernel.git;a=commitdiff;h=6daf48108cb0136b762998bb5c2b0b32234b4e93 I also updated the alsa-info.sh script to gather this information. Jaroslav ----- Jaroslav Kysela <perex@xxxxxxxx> Linux Kernel Sound Maintainer ALSA Project, Red Hat, Inc. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
