thank you! that seems like good work. I am not confident to do the backport, but I will test when the kernel is available in a repo to install. Or if you can send me a compiled kernel to test I can test it. On 17/12/2018 14:16, Takashi Sakamoto wrote: > Hi, > (C.C.ed to alsa-devel) > > At first, I apologize that ALSA fireface driver since Linux kernel > v4.12 includes some bugs for its packet handling for PCM capture > substream[1]. > This bug can brings disorder of jackd process. > > Furthermore, even if handling rx packets correctly, Fireface 400 > cannot generate sounds because audio data frame is not picked up from > isochronous packets to DSP[2]. > > I've already posted some patches to fix these bugs. The patches were > already merged to ALSA upstream and they'll be going to mainline in > next merge window for v4.21 kernel. They were also posted for stable > kernel and later you can receive patched kernel image if you use any > stable kernels. > > If you'll test these patches in current your environment, please get > recent code from my remote repository for backport to Linux v4.17 or > later: > https://github.com/takaswie/snd-firewire-improve > > Your test will be great help to me because I've already left Fireface > 400. > (I rented it just for two weeks and I'll leave Fireface 800 soon as > well.) > > On Fri, 14 Dec 2018, thet wrote: >> OK I have the FF400 set up now. > > In my recent work for Fireface 800[3][4], I ensure that Fireface 800 > can generate sounds even if the HOST LED turns on. This is the same > experience with Fireface 400. Thus you can ignore whether the LED turn > off > or not. > >> What action should I take to create an error that is meaningful? >> .. >> when I start audacious from the terminal using the alsa output plugin >> and the FF400 selected I get: > > Any GUI tools are not necessarily good for debugging. Please use > 'aplay' insted, like: > > $ aplay -v -D hw:Fireface400 -r 44100 -c 18 -f S32_LE /dev/urandom > $ aplay -v -D hw:Fireface400 -r 88200 -c 14 -f S32_LE /dev/urandom > $ aplay -v -D hw:Fireface400 -r 192000 -c 10 -f S32_LE /dev/urandom > > In the above cases, I expect your unit can generate noisy sounds with the > latest code of driver. > > Anyway, I note you not to drop list address > (alsa-devel@xxxxxxxxxxxxxxxx) from CC list. It's valuable to share > experiences of errors/failures because potentially they are good > information for developers to seek bugs in software and be going to > fix them. > > [1] [PATCH 1/3] ALSA: firewire-lib: fix wrong handling > payload_length as payload_quadlet > http://mailman.alsa-project.org/pipermail/alsa-devel/2018-December/143147.html > > [2] [PATCH] ALSA: fireface: fix for state to fetch PCM > frames > http://mailman.alsa-project.org/pipermail/alsa-devel/2018-December/143150.html > > [3] [PATCH 0/8] ALSA: fireface: add support for Fireface > 800 with MIDI functionality only > http://mailman.alsa-project.org/pipermail/alsa-devel/2018-December/142826.html > > [4] [PATCH 0/5] ALSA: fireface: add support for Fireface > 800 with streaming functionality > http://mailman.alsa-project.org/pipermail/alsa-devel/2018-December/143154.html > > > > Regards > > Takashi Sakamoto > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
