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. > >> 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. > > > Regards, > Clemens Here is more context for the endpoint related warning: usb 4-1.5: new high-speed USB device number 9 using ehci-pci usb 4-1.5: New USB device found, idVendor=0582, idProduct=0111 usb 4-1.5: New USB device strings: Mfr=1, Product=2, SerialNumber=0 usb 4-1.5: Product: SH-01 usb 4-1.5: Manufacturer: Roland usb 4-1.5: Creating new capture data endpoint #84 usb 4-1.5: Setting params for ep #84 (type 0, 12 urbs), ret=0 usb 4-1.5: Creating new playback data endpoint #5 usb 4-1.5: Re-using EP 84 in iface 1,1 @ffff8802b902e000 usb 4-1.5: Setting params for ep #5 (type 0, 12 urbs), ret=0 usb 4-1.5: Setting params for ep #84 (type 0, 12 urbs), ret=0 usb 4-1.5: Re-using EP 84 in iface 1,1 @ffff8802b902e000 usb 4-1.5: Unable to change format on ep #84: already in use usb 4-1.5: Re-using EP 84 in iface 1,1 @ffff8802b902e000 usb 4-1.5: Unable to change format on ep #84: already in use usb 4-1.5: Re-using EP 84 in iface 1,1 @ffff8802b902e000 ... ... (repeated 20 times in total) ... usb 4-1.5: Re-using EP 5 in iface 0,1 @ffff88040b14a000 usb 4-1.5: Re-using EP 84 in iface 1,1 @ffff8802b902e000 usb 4-1.5: Setting params for ep #5 (type 0, 12 urbs), ret=0 usb 4-1.5: Setting params for ep #84 (type 0, 12 urbs), ret=0 Stefan ------------------------------------------------------------------------------ _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
