As already explained, I have tested the following kernels: - kernel 5.0.2 -----> BROKEN - kernel 4.17.10 --> BROKEN - kernel 4.12.9 ---> BROKEN So, it's been around for very long. What do you suggest doing? I have found reports on the web about similar problems (with other audio interfaces) with kernels>3.0.0. Regards, Guido Il 22 marzo 2019 15:47:36 CET, Takashi Iwai <tiwai@xxxxxxx> ha scritto: >On Fri, 22 Mar 2019 14:44:48 +0100, >Guido Trentalancia wrote: >> >> Hello Takashi. >> >> I have carried out the test that you proposed... >> >> My reply follows your quoted text. >> >> On Fri, 22/03/2019 at 11.12 +0100, Takashi Iwai wrote: >> > On Fri, 22 Mar 2019 11:04:01 +0100, >> > Guido Trentalancia wrote: >> > > >> > > Hello Takashi, >> > > >> > > I am using the latest version of everything, including kernel and >> > > ALSA >> > > userspace library / tools. >> > > >> > > The other user has exactly the same hardware and has tested same >> > > firmware >> > > (both 1.36 and latest 1.46), but with Fedora 29 and it is >working. >> > > >> > > Perhaps Fedora 29 has a different version of the ALSA library, I >> > > will find >> > > out, try to downgrade, test again and report back. >> > >> > Yes, that'd be really helpful. If aligning the software doesn't >fix >> > the issue, it's either because of the hardware or the difference of >> > usage patterns. >> >> I have tested exactly the same ALSA userspace library and plugins >> distributed by Fedora 29 and it does NOT work ! >> >> As already explained, the usage pattern is exactly the same between >me >> and the user which is not experiencing this severe problem. >> >> Also, the hardware is the same: Hercules P32 DJ (with exactly the >same >> firmware version 1.46 which is the latest). >> >> So, the conclusion is that it must be a kernel bug ! I was expecting >> this, as already pointed out in previous messages. > >Did you test the very same kernel, too? Without that confirmation, no >one can conclude that at all... > >If the kernel makes difference, you can try identify which kernel >version starts showing the problem, and at best, do git bisection. > > >thanks, > >Takashi > > >> Can you please help me fix this bug since you wrote the driver and/or >> are maintaining it ? >> >> Thanks, >> >> Guido >> >> > thanks, >> > >> > Takashi >> > >> > > >> > > Guido >> > > >> > > Il 22 marzo 2019 10:53:11 CET, Takashi Iwai <tiwai@xxxxxxx> ha >> > > scritto: >> > > >> > > On Fri, 22 Mar 2019 10:17:17 +0100, >> > > Guido Trentalancia wrote: >> > > >> > > It cannot be a firmware bug, as you say, because: >> > > >> > > - it does NOT happen on Windows! >> > > >> > > It doesn't mean that the device behaves correctly as >> > > advertised. >> > > >> > > - it does NOT even always happen on Linux: other users >> > > (with different kernel >> > > / ALSA library) are not experiencing the same problem; >> > > - it happens with several firmware versions, including >the >> > > latest one (1.36 >> > > and 1.46). >> > > >> > > So it is either a bug in ALSA kernel driver, USB sound >> > > driver (more likely) or >> > > ALSA library. >> > > >> > > Now, you are in charge of the USB sound driver, can you >> > > please double check?? >> > > >> > > If it doesn't happen for other users with the very same >device, >> > > you'd >> > > need to identify what's the difference between your case and >> > > others. >> > > For example, if the difference of alsa-lib matters, you can >try >> > > the >> > > very same condition. >> > > >> > > This kind of bug can't be easily debugged without the actual >> > > hardware, unfortunately. >> > > >> > > Takashi >> > > >> > > Regards, >> > > >> > > Guido >> > > >> > > Il 22 marzo 2019 09:55:52 CET, Takashi Iwai ><tiwai@xxxxxxx >> > > > ha scritto: >> > > >> > > On Thu, 21 Mar 2019 23:27:46 +0100, >> > > Guido Trentalancia wrote: >> > > >> > > I wonder if this might be due to a bug in the >> > > "USB Audio Driver for Alsa"? >> > > >> > > >https://git.kernel.org/pub/scm/linux/kernel/git/t >> > > orvalds/linux.git/tree/sound/usb >> > > >> > > >https://git.kernel.org/pub/scm/linux/kernel/git/t >> > > iwai/sound.git/tree/sound/usb >> > > >> > > More likely a buggy firmware of your USB audio >device >> > > :) >> > > >> > > From the driver implementation POV, both audio and >> > > MIDI devices are >> > > handled by individual endpoints, hence they >shouldn't >> > > conflict. >> > > >> > > Or another possibility would be some USB host side >> > > issue like the >> > > bandwidth. But >> > > it's a MIDI stream that is very low data rate, so >this >> > > sounds also unlikely... >> > > >> > > thanks, >> > > >> > > Takashi >> > > >> > > Guido >> > > >> > > On the 20th of March 2019 at 21.47 Guido >> > > Trentalancia >> > > <guido@xxxxxxxxxxxxxxxx wrote: >> > > >> > > Hello. >> > > >> > > I am hitting a very serious bug (ALSA >kernel >> > > driver or ALSA library) >> > > when using the Hercules P32 DJ audio >> > > interface. >> > > >> > > The sound is severely distorted during MIDI >> > > transfers. >> > > >> > > To reproduce: >> > > >> > > + start playing something in a first >> > > console: >> > > >> > > console1# AUDIODEV=hw:2,0 play audio.wav >> > > >> > > + the audio plays fine >> > > >> > > + now start "amidi" in a second console >> > > while the above track is still >> > > playing >> > > >> > > console2# >> > > amidi -p hw:2,0,0 -d >> > > >> > > + the sound is now severely distorted >> > > (basically noise, with some >> > > hard- >> > > to-distinguish features resembling the >> > > original track) until "amidi" >> > > is >> > > interrupted ! >> > > >> > > >> _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
