OK. I took on the challenge and tested my MOTU 828ES on my old Macbook Pro with multi-boot setup.shellwalker wrote: ↑Thu Apr 15, 2021 5:59 pm
Thanks a lot Drumfix! That certainly throws another light on the whole discussion....
It seems that all the fuss about fixing Linux may have been wasted effort.
I connected the MOTU via USB (not Thunderbolt, since my Mac does not have TB) and used the same port for running an Ardour test under both Linux and Mac-OS.
Here are my results:
1. Mac OS (Version 10.10.5 "Yosemite"): Ardour runs fine. Testsignal ran stable for over 2 hours until I stopped the test. No drifting and no distortion whatsoever.
2. Ubuntu (Version 18.05.5 LTS. Kernel = 4.15.0-142): Drifting and distortion occurs pretty soon after start or even immediately. Sometimes the test starts without any sound to be heard.
Conclusion:
To me it appears that the problem is actually Linux!
Any other opinions or explanations?