On Fri, 22 Mar 2019 16:05:17 +0100, Guido Trentalancia wrote: > > I suppose the Fedora 29 kernels are included in the range I tested as broken, > i.e. 4.12 -- 5.0. > > So, there is something triggering it on my system and not the other, maybe the > USB system as pointed out by Clemens. You can try different USB ports, too, e.g. if there are both USB 3.0 and 2.0 ports. > I'll make some research on the two USB systems... > > I would also like to try USB Audio driver from kernel 3.0.1. > > What else do you suggest? If any, the problem is rather about the USB core side (likely the host driver), not the USB audio driver. I can imagine some bandwidth management or iosc transfer problem. Takashi > > Guido > > Il 22 marzo 2019 15:58:23 CET, Takashi Iwai <tiwai@xxxxxxx> ha scritto: > > On Fri, 22 Mar 2019 15:54:03 +0100, > Guido Trentalancia wrote: > > 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? > > But which kernel is used for another user who can use without the > problem? I suppose they use the recent kernel with Fedora? > > I have found reports on the web about similar problems (with other audio > interfaces) with kernels>3.0.0. > > Such a regression should have been reported earlier, otherwise it > becomes more and > more difficult to catch up... > > thanks, > > Takashi > > 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
