hi Florian, Florian Walpen: > I have a Scarlett 18i20 myself, but maybe a different generation - it has 18 > recording channels as its name suggests. Is 20 recording channels correct for > your device? this is a 3rd generation 18i20; as well the usual physical inputs it has a stereo loopback channel that can be configured in the built-in mixer and which appears as an additional two recording channels. i think (although i'm not certain) that loopback functionality is new in the 3rd generation model.
this is (very briefly) documented in the manual, which doesn't really add anything to what i just said but does show a screenshot of Ableton with 20 channels on p.16, which matches how the interface appeared in Logic when i used it there: https://fael-downloads-prod.focusrite.com/customer/prod/downloads/scarlett_18i20_3rd_gen_user_guide_v3_english_en.pdf > > FreeBSD Audio Driver (64bit 2009061500/amd64) > > Installed devices: > > pcm0: <Focusrite Scarlett 18i20 USB> on uaudio0 (1p:0v/1r:0v) default > > snddev > > flags=0x3e6<AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,BITPERFECT,VPC> > > [pcm0:play:dsp0.p0]: spd 48000, fmt 0x01401000, flags 0x2000110c, > > 0x00000001, pid 22326 (virtual_oss) interrupts 115908, underruns 0, feed > > 115907, ready 123440 [b:30720/15360/2|bs:131040/65520/2] channel > > flags=0x2000110c<RUNNING,TRIGGERED,BUSY,HAS_SIZE,BITPERFECT> {userland} -> > > feeder_root(0x01401000) -> {hardware} > > [pcm0:record:dsp0.r0]: spd 48000, fmt 0x01401000, flags 0x2000112c, > > 0x00000001, pid 22326 (virtual_oss) interrupts 115930, overruns 97, feed > > 229796, hfree 30720, sfree 65440 [b:30720/15360/2|bs:65440/32720/2] channel > > flags=0x2000112c<RUNNING,TRIGGERED,SLEEPING,BUSY,HAS_SIZE,BITPERFECT> > > {hardware} -> feeder_root(0x01401000) -> {userland} > > Installed devices from userspace: > > dsp.full: <Virtual OSS> (play/rec) > > dsp.record: <Virtual OSS> (play/rec) > > dsp: <Virtual OSS> (play/rec) > > I see that there's a lot of recording overruns and the recording software > side > buffer of the pcm device is unusually small. Does recording work well for you? i haven't had a chance to test recording yet beyond a single work conference call, as i've only just got playback working well (that required a lot of fiddling with various options until i settled on virtual_oss). if you can suggset any obvious changes i'd appreciate that - maybe it's just a case of increasing the virtual_oss buffer? i did have to increase the playback buffer a bit as the virtual_oss default is rather small. > Apart from that, I'd be interested in the exact circumstances this problem > occurs. Could you provide the dmesg and sndstat output as above, but with the > settings in loader.conf applied and playback hanging? > Since you're using virtual_oss, I suppose it produces an error log somewhere? > And then maybe the output of the following commands, also while playback is > hanging: > > sysctl hw.snd > sysctl dev.pcm.0 i'll open a bug with this and the other details once i get a chance to reboot again to test, probably later today. thanks, lexi.
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