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Date:      Mon, 12 Jul 2021 16:32:44 +0000
From:      bugzilla-noreply@freebsd.org
To:        usb@FreeBSD.org
Subject:   [Bug 257082] Sound with Scarlett Solo 3rd intermittently cuts off for very short periods of milliseconds.
Message-ID:  <bug-257082-19105-Q4KlJ2Pv43@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-257082-19105@https.bugs.freebsd.org/bugzilla/>
References:  <bug-257082-19105@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D257082

--- 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 =3D 64 microframes.

Jul 10 22:02:46 nimfsoft kernel: xhci_setup_generic_chain: MFINDEX=3D0x0000=
0bfa
Jul 10 22:02:46 nimfsoft kernel: xhci_setup_generic_chain: MFINDEX=3D0x0000=
0c45
Jul 10 22:02:46 nimfsoft kernel: xhci_setup_generic_chain: MFINDEX=3D0x0000=
0c8a
Jul 10 22:02:46 nimfsoft kernel: xhci_setup_generic_chain: MFINDEX=3D0x0000=
0cd4
Jul 10 22:02:46 nimfsoft kernel: xhci_setup_generic_chain: MFINDEX=3D0x0000=
0d03
Jul 10 22:02:46 nimfsoft kernel: xhci_setup_generic_chain: MFINDEX=3D0x0000=
0d54
Jul 10 22:02:46 nimfsoft kernel: xhci_setup_generic_chain: MFINDEX=3D0x0000=
0dab

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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