LinuxMusicians

Hey, I'm glad to hear that the new 828 seems to be working well on linux! Thanks mixingmanatee for your help getting CM5 ported! I've written to Dylan via Motu tech support some months ago, he was full of work, now i know why! He told me he was writing an alsa driver for avb interfaces but i don't k...

Is there the possibility to somehow lock the samplerate of the device (no matter if ES or not) ? My main problem with using the Ultralite as a normal USB soundcard is that (I think) ALSA probes every possible samplerate on initialization (boot), leading to loud pops and clicks while probing, and di...

Sorry to leave everyone hanging, unfortunately I still don't have any news to report at this time. I have been waiting to hear back on my request for additional information regarding how the differences with the UltraLite ES variant could effect this behavior. I will definitely provide an update whe...

Hi guys! I've a strange problem with the new firmware on the ultralite avb es. Playback is crackling and it's distorted, coming out from 1-2, 9-10, 17-18. Same thing in a patched kernel laptop and not-patched other laptop... I am able to confirm issues with this firmware and the UltraLite AVB ES sp...

There is also this guy in the comments on an amazon product saying that AVB is supported by the thunderbolt chipset, so you can use any tb to ethernet adapter... Thunderbolt in this instance can be thought of as an external pcie port. So, I don’t believe the thunderbolt chipset would be able to pro...

Thanks!! Hopefully I will be able to run some tests this coming weekend... ("motu" driver + vendor mode = 1)... Just clarifying since I might be misunderstanding what you mean by vendor mode = 1, but the posted firmwares (1.4.5+92559) will only address issues that occur in 24 channel UAC ...

I have a question regarding the buffer settings. How does one set "Host Buffer Size" ,"Host Safety Offset" and alsa/jack frames/period "right" ? If you are talking about the "Host Buffer Size" and "Host Safety Offset" options in the web app, these s...

KREAM wrote: ↑Sun Jan 15, 2023 5:24 pm

Thanks for your help here! I also have a 1248 that I would love to get working in Linux again.

Here is a build for the 8M, 16A, 1248 and 112D devices.

MOTU AVB 1.4.5+92559 for 8M, 16A, 1248 and 112D.update

stanlea wrote: ↑Thu Dec 29, 2022 11:00 pm

On my side I can't actually see what would be the advantage of the vendor mode, if the device works in Class Compliant mode. Better stability or latency ?

The only difference in vendor mode is more channels (up to 64x64).

Note : I've set 24 channels for jack (I use Cadence) althought 828ES has only 22 AFAIK : 2 microphones + 8 line in + 2 Toslink + 8 ADAT + 2 SP/DIF The channel count is configurable on the routing grid web app page. In class compliant mode, the device always sends 24x24 channels to and from the host...

Edit : the first hardware input (microphone 1 on the front side of the 828ES) is still routed to input 17 in Carla or Ardour. While audio is running can you try this utility (motu-sync-rec) to see if it corrects the input channel mapping? Can you also share the output logs from this tool? motu-sync...

jkohls These are interesting results. I think I need to do some reading about how Jack's rate/period/frames interacts with the underlying ALSA driver. The following thread on the subject is intriguing to me. List of JACK Frame & Period settings ideal for USB interface ... you can enter the numb...

Are there other configurations you'd like to see tested? I'm thinking of doing sample rate tests but I don't know which ones we should expect to work or not work. It should be okay to test all sampling rates in USB Audio Class (UAC) mode (24-channels). This firmware does not yet address any issues ...

@stanlea Thank you for the recording and motu-util output. I have a hunch as to what could be happening. I will post another firmware for you to try tomorrow. Lets see if this works any better: MOTU AVB 1.4.5+92559 for UltraLite AVB and Stage-B16.update MOTU AVB 1.4.5+92559 for 828ES and 8PreES.upd...

stanlea Thank you for the recording and motu-util output. I have a hunch as to what could be happening. I will post another firmware for you to try tomorrow. jkohls Thank you for the detailed logs! Those dmesg logs are intriguing. The summary of the results is that there's decimated audio in UAB mo...