On 07/28/2016 01:27 PM, Clemens Ladisch wrote: > Stefan Sauer wrote: >> Another weir issue is that once the usb connection is established, >> playing the synth from its own knobs and keys is super sluggish (e.g. a >> key release is recognized with a multi-second delay). > Apparently, the firmware waits for the PC to read the MIDI messages. > Which the Linux driver does not do until a MIDI port is actually opened, > in order to save a little bit of power. Oh well, I'll have to change > this back. If you can point me to the change I can locally test if that fixes it. I just rebuilt my kernel and locally applied http://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/?id=ae7cc709f2ec11b49fc31b20cd8c943794ae9576 which is only in Takashis branch, but not in the mainline. It does not seem seem to have any visiible effect though. Am I right to assume that the quirks-table.h ends up in snd-usb-audio.ko ? Because I only updated this mod. Any idea what I could try to figure out why the incomming audio is silent? > >> One detail is that when connecting the synth to usb I get several >> "[159320.243035] usb 4-1.5: Unable to change format on ep #84: already >> in use" messages in syslog. > This is another driver bug. The exact cause is not known, and nobody > has fixed it yet due to lack of time. This is from ./sound/usb/endpoint.c:811: I am really just guessing, but could this be related to that these devices run both an audio and a midi interface on the same usb connection? Stefan > > > Regards, > Clemens ------------------------------------------------------------------------------ _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
