On the 22nd of March 2019 at 16.05 Guido Trentalancia guido@trentalancia.com wrote:
I suppose the Fedora 29 kernels are included in the range I tested as broken, i.e. 4.12 -- 5.0.
I have checked and can now confirm the above, as Fedora 29 kernel is version 4.18.16, therefore included in the same range I tested as broken.
So, there is something triggering it on my system and not the other, maybe the USB system as pointed out by Clemens.
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?
Guido
Il 22 marzo 2019 15:58:23 CET, Takashi Iwai tiwai@suse.de 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@suse.de 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 hastested 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 theALSA library, I
will find out, try to downgrade, test again and report back. Yes, that'd be really helpful. If aligning the softwaredoesn't fix
the issue, it's either because of the hardware or thedifference of
usage patterns. I have tested exactly the same ALSA userspace library andplugins
distributed by Fedora 29 and it does NOT work ! As already explained, the usage pattern is exactly the samebetween me
and the user which is not experiencing this severe problem. Also, the hardware is the same: Hercules P32 DJ (withexactly the same
firmware version 1.46 which is the latest). So, the conclusion is that it must be a kernel bug ! I wasexpecting
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 gitbisection.
thanks, Takashi Can you please help me fix this bug since you wrote thedriver and/or
are maintaining it ? Thanks, Guido thanks, Takashi Guido Il 22 marzo 2019 10:53:11 CET, Takashi Iwaiscritto: 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 behavescorrectly as
advertised. - it does NOT even always happen on Linux:other users
(with different kernel / ALSA library) are not experiencing thesame problem;
- it happens with several firmwareversions, including the
latest one (1.36 and 1.46). So it is either a bug in ALSA kerneldriver, USB sound
driver (more likely) or ALSA library. Now, you are in charge of the USB sounddriver, can you
please double check?? If it doesn't happen for other users with thevery same device,
you'd need to identify what's the difference between your case and others. For example, if the difference of alsa-libmatters, you can try
the very same condition. This kind of bug can't be easily debuggedwithout the actual
hardware, unfortunately. Takashi Regards, Guido Il 22 marzo 2019 09:55:52 CET, Takashi Iwai<tiwai@suse.de
ha scritto: On Thu, 21 Mar 2019 23:27:46 +0100, Guido Trentalancia wrote: I wonder if this might be due to abug in the
"USB Audio Driver for Alsa"?https://git.kernel.org/pub/scm/linux/kernel/git/t
orvalds/linux.git/tree/sound/usbhttps://git.kernel.org/pub/scm/linux/kernel/git/t
iwai/sound.git/tree/sound/usb More likely a buggy firmware of yourUSB audio device
:) From the driver implementation POV,both audio and
MIDI devices are handled by individual endpoints, hencethey shouldn't
conflict. Or another possibility would be someUSB host side
issue like the bandwidth. But it's a MIDI stream that is very lowdata rate, so this
sounds also unlikely... thanks, Takashi Guido On the 20th of March 2019 at21.47 Guido
Trentalancia <guido@trentalancia.com wrote: Hello. I am hitting a very seriousbug (ALSA kernel
driver or ALSA library) when using the Hercules P32 DJaudio
interface. The sound is severelydistorted during MIDI
transfers. To reproduce: + start playing something ina first
console: console1# AUDIODEV=hw:2,0 playaudio.wav
+ the audio plays fine + now start "amidi" in asecond console
while the above track is still playing console2# amidi -p hw:2,0,0 -d + the sound is now severelydistorted
(basically noise, with some hard- to-distinguish featuresresembling the
original track) until "amidi" is interrupted !
Alsa-devel mailing list Alsa-devel@alsa-project.org https://mailman.alsa-project.org/mailman/listinfo/alsa-devel