On Fri, 08 Jan 2016 15:18:58 +0100, Owen Williams wrote:
Sorry to bump my own thread, but I don't know how else to report bugs to ALSA (I think the bug tracker was abandoned a while back?). I'm willing to do work to diagnose and fix this problem (I'm comfortable building kernels, doing git bisect, using gdb, etc) but I need some guidance about how to start.
If the problem is easily reproducible, could you try bisection? This is the best way to spot out the cause.
thanks,
Takashi
On Thu, 2015-12-31 at 13:26 -0500, Owen Williams wrote:
Sometime between kernels 3.13 (ubuntu 14.04) and 3.19 (15.04) there was a regression that caused the mixer elements of the Traktor Audio10 driver to stop responding to changes to True. I have an older machine still running 14.04, and if I open alsamixer I can see and interact with the 8 basic boolean switches:
numid=3,iface=MIXER,name='Direct Thru Channel A' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=4,iface=MIXER,name='Direct Thru Channel B' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=5,iface=MIXER,name='Direct Thru Channel C' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=6,iface=MIXER,name='Direct Thru Channel D' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=7,iface=MIXER,name='Phono Input Channel A' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=8,iface=MIXER,name='Phono Input Channel B' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=9,iface=MIXER,name='Phono Input Channel C' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=10,iface=MIXER,name='Phono Input Channel D' ; type=BOOLEAN,access=rw------,values=1 : values=off
or I can use amixer: amixer -c T10 cset numid=8 on
however on my newer machine, with ubuntu 15.04 and 15.10, I am unable to change the values to true. I am a member of the audio group and I have also tried with sudo, but when I try to set the value on nothing happens:
$ amixer -c T10 cset numid=8 on numid=8,iface=MIXER,name='Phono Input Channel B' ; type=BOOLEAN,access=rw------,values=1 : values=off
The fun part is, if I connect the card to my mac I can set startup conditions for these flags. I can set them to true, and when I connect to my linux machines the flags start up as true. And then, even on the newer kernel, I can turn them off! But I can't turn them back on again.
This sound card is the one I'd like to recommend officially for the Mixxx DJ project so I'd really like to get to the bottom of this issue.
thanks, Owen Williams
A Lead Developer, Mixxx.org
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