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.
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@suse.de 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 asadvertised.
- 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 sounddriver (more likely) or ALSA library.
Now, you are in charge of the USB sound driver, can youplease 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@suse.deha 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/torvalds/linux.git/tree/sound/usb
https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git/tree/sound/usb
More likely a buggy firmware of your USB audio device:)
From the driver implementation POV, both audio andMIDI devices are handled by individual endpoints, hence they shouldn't conflict.
Or another possibility would be some USB host sideissue 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@trentalancia.com wrote: Hello. I am hitting a very serious bug (ALSA kerneldriver or ALSA library) when using the Hercules P32 DJ audio interface.
The sound is severely distorted during MIDItransfers.
To reproduce: + start playing something in a firstconsole:
console1# AUDIODEV=hw:2,0 play audio.wav + the audio plays fine + now start "amidi" in a second consolewhile 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 !