[LAU] Has Linux kernel gone mad?

[John Murphy]

On Fri, 06 Mar 2020 23:27:09 +0000 "Erik Schoster" <erik at hecanjog.com> wrote:

> There was a very useful looking thread about this around March 30th of 2019 on this mailing list which I've kept bookmarked -- one reference in there is this thread on the linux musicians forum: https://linuxmusicians.com/viewtopic.php?f=6&t=18046

Thanks for the link. I haven't read it all yet.

> Somewhere in there I think I remember someone finding a version of the MOTU firmware that they found to work reliably with linux, I haven't dug it up yet but maybe I will this weekend -- would be nice to reclaim this device!
> 
> I was surprised after a couple years of basically no issues with it then transferring it to be used on a mac in a shared environment for a while (where the firmware was upgraded continuously) to find when I reclaimed it that it no longer worked under linux... I have the clock sync issue that sounds like a bitcrushed LFO going from a clean sounding signal and then sputtering out into silence and back again over the course of a minute or two...

Mine was working well on a dedicated (Windows) PC, but when I tried it on Linux, on newer hardware, and had that bitcrusher effect ('From computer' audio actually moves to other channels as it squelches away from the first two), I downgraded to firmware version 1.3.2+520 which seemed to get it working well, for a while.

I just tried their very latest firmware upgrade to v1.3.5+626 (Release Date 2019-05-13) and watched those blue input dots move around again briefly and I'm back to 1.3.2+520 and it's working OK again! At least Audacity is playing a .wav through jack.

> All to say I'm hopeful that rolling the firmware back is all that's needed but maybe someone with more recent direct experience can chime in!

Upgrading and then downgrading again seems to have fixed my problem. I noticed that those 'clock not valid' messages stopped in the middle of a block, which makes me wonder if the kernel attempts to initialise it come too fast for the device.

Alsa direct doesn't seem to work, but I may have messed something up trying to solve the problem I wrote about. I'll try again tomorrow. Wondering if it'll work when I boot it all up again.

Thanks for responding. I'll probably start a thread with a better title if I discover anything new. Certainly try 1.3.2+520 from the Ultralite AVB section here: https://motu.com/techsupport/technotes/firmwarechangelog on yours.

-- 
John.

> 
> On Fri, Mar 6, 2020, at 11:28 AM, John Murphy wrote:
> > They say that doing the same thing repeatedly, while expecting
> > a different result, is a sign of madness.
> > 
> > I've been trying to discover why my MOTU Ultralite AVB doesn't
> > work on Linux Mint 19.3 (5.3.0-40-generic) and see the following
> > in /var/log/syslog, which confirms, a total of 240 times, that:
> > 
> > "usb 1-14: clock source 1 is not valid"
> > 
> > I'm trying to dual boot. (Kernel 'thinks' my gaming wheel is a
> > mouse, so I had to make a udev rule for that.) and the MOTU is
> > usually synced to an external optical source at 48kHz. The boot
> > process appears to switch it to 192kHz briefly and then to 44.1k
> > which isn't going to be a good source because it's 48kHz.
> > 
> > Anyone using a MOTU with a modern Linux ubuntu flavour could help?
> > 
> > Relevant part of syslog below sig separator.
> > 
> > -- 
> > Thanks in advance.
> > 
> > /var/log/syslog:
> > 
> > Mar 5 20:40:40 mint01 kernel: [ 423.774917] usb 1-14: new high-speed USB device number 9 using xhci_hcd
> > Mar 5 20:40:40 mint01 kernel: [ 423.944393] usb 1-14: New USB device found, idVendor=07fd, idProduct=0005, bcdDevice= 2.00
> > Mar 5 20:40:40 mint01 kernel: [ 423.944398] usb 1-14: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> > Mar 5 20:40:40 mint01 kernel: [ 423.944402] usb 1-14: Product: UltraLite AVB
> > Mar 5 20:40:40 mint01 kernel: [ 423.944405] usb 1-14: Manufacturer: MOTU
> > Mar 5 20:40:40 mint01 kernel: [ 423.944407] usb 1-14: SerialNumber: munged
> > Mar 5 20:40:40 mint01 mtp-probe: checking bus 1, device 9: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-14"
> > Mar 5 20:40:40 mint01 mtp-probe: bus: 1, device: 9 was not an MTP device
> > Mar 5 20:40:40 mint01 kernel: [ 423.970417] mc: Linux media interface: v0.10
> > Mar 5 20:40:40 mint01 kernel: [ 423.994249] usb 1-14: clock source 1 is not valid, cannot use
> > Mar 5 20:40:41 mint01 kernel: [ 424.832923] usb 1-14: clock source 1 is not valid, cannot use
> > Mar 5 20:40:41 mint01 kernel: [ 424.844172] usbcore: registered new interface driver snd-usb-audio
> > Mar 5 20:40:41 mint01 upowerd[1340]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-14
> > Mar 5 20:40:41 mint01 upowerd[1340]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-14/1-14:1.1
> > Mar 5 20:40:41 mint01 upowerd[1340]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-14/1-14:1.3
> > Mar 5 20:40:41 mint01 upowerd[1340]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-14/1-14:1.4
> > Mar 5 20:40:41 mint01 upowerd[1340]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-14/1-14:1.2
> > Mar 5 20:40:41 mint01 upowerd[1340]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-14/1-14:1.0
> > Mar 5 20:40:41 mint01 kernel: [ 424.881343] usb 1-14: clock source 1 is not valid, cannot use
> >  (previous line repeated 40 times)
> > Mar 5 20:40:44 mint01 pulseaudio[1302]: [pulseaudio] module-alsa-card.c: Failed to find a working profile.
> > Mar 5 20:40:44 mint01 pulseaudio[1302]: [pulseaudio] module.c: Failed to load module "module-alsa-card" (argument: "device_id="1" name="usb-MOTU_UltraLite_AVB_0001f2fffe005ded-00" card_name="alsa_card.usb-MOTU_UltraLite_AVB_0001f2fffe005ded-00" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes card_properties="module-udev-detect.discovered=1""): initialization failed.
> >  (all repeated 6 times)
> > Mar 5 20:40:44 mint01 pulseaudio[1302]: [pulseaudio] module-udev-detect.c: Tried to configure /devices/pci0000:00/0000:00:14.0/usb1/1-14/1-14:1.0/sound/card1 (alsa_card.usb-MOTU_UltraLite_AVB_0001f2fffe005ded-00) more often than 5 times in 10s
> > _______________________________________________
> > Linux-audio-user mailing list
> > Linux-audio-user at lists.linuxaudio.org
> > https://lists.linuxaudio.org/listinfo/linux-audio-user
> >