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. 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@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
