FS#64960 : [linux] >5.3.13.1-1 audio corruption using jack

FS#64960 - [linux] >5.3.13.1-1 audio corruption using jack

Attached to Project: Arch Linux
Opened by Rainer Schaue (void42) - Wednesday, 25 December 2019, 14:35 GMT
Last edited by Tobias Powalowski (tpowa) - Thursday, 31 March 2022, 05:26 GMT

Task Type	Bug Report
Category	Kernel
Status	Closed
Assigned To	Tobias Powalowski (tpowa) Jan Alexander Steffens (heftig)
Architecture	All
Severity	Low
Priority	Normal
Reported Version
Due in Version	Undecided
Due Date	Undecided
Percent Complete
Votes	2 imperhelp (imperhelp) (2020-02-21) Rainer Schaue (void42) (2020-01-04)
Private	No

Details

Kernels later than version 5.3.13.1-1 lead to audio corruption in my jack audio after some minutes (it starts out fine), it sounds a bit like frequency modulation:
https://www.dropbox.com/s/yca6p9wse5tgnjd/audioproblem.wav?dl=0

This persists until the jack server is restarted.

I had this behavior before when those Meltdown/Spectre mitigations came out, luckely it stopped after a later release but now it is back again.
I tried any version since then the laster being:

Linux void 5.4.6-arch1-1 #1 SMP PREEMPT Sat, 21 Dec 2019 16:34:41 +0000 x86_64 GNU/Linux

I tried alsa, pulse and jack input all have the same behavior. Recording a source in "broken" mode sounds ok so it seems to be on the output side.

Kernel log does not seem to include anything useful (attached).

Audiocard:
card 1: R15 [RME Digi9652 (Rev 1.5)], device 0: RME Digi9652 (Rev 1.5) [RME Digi9652 (Rev 1.5)]
Subdevices: 0/1
Subdevice #0: subdevice #

I tried switching to linux-rt which was at a lower version at the time, but since it updated it has the same problem.