[Bug 257082] Sound with Scarlett Solo 3rd intermittently cuts off for very short periods of milliseconds.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257082

--- Comment #19 from Hans Petter Selasky <hselasky@FreeBSD.org> ---
Hi,

I see in the log that the time between interrupts is unstable.

The delta on MFINDEX should be close to 8*8 = 64 microframes.

Jul 10 22:02:46 nimfsoft kernel: xhci_setup_generic_chain: MFINDEX=0x00000bfa
Jul 10 22:02:46 nimfsoft kernel: xhci_setup_generic_chain: MFINDEX=0x00000c45
Jul 10 22:02:46 nimfsoft kernel: xhci_setup_generic_chain: MFINDEX=0x00000c8a
Jul 10 22:02:46 nimfsoft kernel: xhci_setup_generic_chain: MFINDEX=0x00000cd4
Jul 10 22:02:46 nimfsoft kernel: xhci_setup_generic_chain: MFINDEX=0x00000d03
Jul 10 22:02:46 nimfsoft kernel: xhci_setup_generic_chain: MFINDEX=0x00000d54
Jul 10 22:02:46 nimfsoft kernel: xhci_setup_generic_chain: MFINDEX=0x00000dab

1) Can you check the "top" command, that no CPU cores are 100% busy?

2) Have you tried to disable any CPU power saving features?

3) What does "pciconf -lv" say about the XHCI host controller?

4) Can you do "dmesg | grep xhci". Should output something like this:

xhci0: <Intel Sunrise Point-LP USB 3.0 controller> mem 0xdf210000-0xdf21ffff
irq 16 at device 20.0 on pci0
xhci0: 32 bytes context size, 64-bit DMA

--HPS

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