On 12/09/2017 06:54 PM, Benjamin via Alsa-user wrote: > Hi everyone, > > > it seems that the problems for BOSS RC-300 and BR-80 have been solved. > https://linuxmusicians.com/viewtopic.php?f=6&t=17180&p=86347&hilit=boss#p86347 > > How can these fixes be implemented into the official ALSA? Would be > great if users didn't have to make their own kernel modules.. I am afraid the case is more complex. I've tried the change for my roland device (GAIA SH-01, USB_ID(0x0582, 0x0111) and while it makes the "Unable to change format on ep #84: already in use" message disappear, it does so by just completely avoiding the roland quirks. For me right now I can send audio from linux to the device, but recording from the device on linux records only silence. If I apply the change, also playing audio to the device is broken. The search_roland_implicit_fb() was introduced by commit ba7c2be114243fa4cfcbc66a81db18e1d55abf4b Author: Clemens Ladisch <clemens@xxxxxxxxxx> Date: Sun Feb 3 22:31:20 2013 +0100 ALSA: usb-audio: detect implicit feedback on Roland devices All the Roland/Edirol/BOSS USB audio devices that need implicit feedback show this unambiguously in their descriptors, so it might be a good idea to let the driver detect this. This should make playback work correctly (at least with Jack) with the following devices: - BOSS GT-100 - BOSS JS-8 Jam Station - Edirol M-16DX - Roland GAIA SH-01 Signed-off-by: Clemens Ladisch <clemens@xxxxxxxxxx> Sadly the code is not documented and I am afraid it is incomplete (seems to only fix playback in one direction). Also I still have a hard time to understand any of that, e.g. how the change matches the patch description: - what is meant by "need implicit feedback"? - how they "show this unambiguously in their descriptors" ... I've added lots of debug prints to my kernel now, but I have no idea how to fix this and so far no one from the original authors offered help on my previous attempts :/ FYI: the "Roland GAIA SH-01" still needs me to run "aseqdump -p 20:0" to avoid the usb power saving issues I reported already :/ (I am on linux-4.9.0). Stefan > > Thanks for any insights here! > > > ------------------------------------------------------------------------------ > > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Alsa-user mailing list > Alsa-user@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/alsa-user ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
