I upgraded my Rivo Plus to Volumio 4.185 today. The upgrade itself completed successfully, but unfortunately playback performance has seriously degraded since the update.
My normal setup for approximately the past monts has been:
Rivo Plus → USB → Denafrips Pontus 15th Anniversary
Before the update this configuration was completely stable. PCM including high-resolution files played smoothly, and DSD playback worked without problems.
Immediately after upgrading to 4.185 I am experiencing:
Small but clearly audible gaps/dropouts during playback, particularly with higher-resolution files.
DSD playback appears to be impossible. Selecting a DSD track and pressing Play does not start playback.
I also tested the HDMI/I²S output to the Pontus. Performance there seems even worse, although USB has been my normal connection and therefore provides the most meaningful before/after comparison.
Standard-resolution material seems less affected, but playback is no longer reliably smooth.
Nothing in the hardware configuration, DAC, USB connection or network was changed—the problems appeared immediately after the 4.185 upgrade.
Earlier today I also experienced the reported update problem where the download remained at 99% and the HDMI interface displayed “Could not start update, please try again.” After that issue was resolved, I eventually allowed the update again and 4.185 installed successfully.
I have now disabled Automatic Updates.
Has anyone else experienced USB playback dropouts, problems with Hi-Res playback, or DSD failing to start on Rivo/Rivo Plus after upgrading to 4.185?
I am happy to provide logs or perform specific tests if this would help diagnose the problem
Update:
I found something potentially important. I had the Fusion DSP plugin installed. After uninstalling Fusion DSP, playback performance improved dramatically.
With Rivo Plus → USB → Denafrips Pontus 15th, PCM playback now appears to be smooth and the small gaps/dropouts seem to have disappeared. DSD playback also starts normally again.
So far, the only clear remaining problem I have found is DSD512, which still has playback gaps.
I have not yet tested all PCM sample rates and DSD64/128/256 extensively enough to say with certainty that everything below DSD512 is completely problem-free, but initial testing is very encouraging.
This suggests that at least a significant part of the problem may be related to Fusion DSP compatibility with 4.185, rather than a general USB playback problem in 4.185.
I will continue testing with Fusion DSP uninstalled and report back if I find further issues.