Hi Ralf,
thanks for your reply. Yes I have tried changing the USB ports, but there was no improvement. My system has both USB2 and USB3 ports so by switching I was also switching controllers.
I have tested with plain ALSA, with S16_LE and S32_LE PCM sample formats, as well as direct digital streams using the DSD_U16_LE, DSD_U32_LE formats. The problem isn't resolved with any one of them, so it must be isolated to one or a combination of the snd-usb-audio kernel module, alsa-lib itself, or some issue with the device itself.
Here are the audio streams available on the FiiO K5Pro. Perhaps there's a clue there as to what parameters I might try to tune next.
cat /proc/asound/Pro/stream0
GuangZhou FiiO Electronics Co.,Ltd FiiO K5 Pro at usb-0000:06:00.0-1, high spee : USB Audio
Playback:
Status: Stop
Interface 1
Altset 1
Format: S32_LE
Channels: 2
Endpoint: 0x01 (1 OUT) (ASYNC)
Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000
Data packet interval: 125 us
Bits: 32
Channel map: FL FR
Sync Endpoint: 0x81 (1 IN)
Sync EP Interface: 1
Sync EP Altset: 1
Implicit Feedback Mode: No
Interface 1
Altset 2
Format: S16_LE
Channels: 2
Endpoint: 0x01 (1 OUT) (ASYNC)
Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000
Data packet interval: 125 us
Bits: 16
Channel map: FL FR
Sync Endpoint: 0x81 (1 IN)
Sync EP Interface: 1
Sync EP Altset: 2
Implicit Feedback Mode: No
Interface 1
Altset 3
Format: SPECIAL
Channels: 2
Endpoint: 0x01 (1 OUT) (ASYNC)
Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000
Data packet interval: 125 us
Bits: 32
DSD raw: DOP=0, bitrev=0
Channel map: FL FR
Sync Endpoint: 0x81 (1 IN)
Sync EP Interface: 1
Sync EP Altset: 3
Implicit Feedback Mode: No
GuangZhou FiiO Electronics Co.,Ltd FiiO K5 Pro at usb-0000:06:00.0-1, high spee : USB Audio
Playback:
Status: Stop
Interface 1
Altset 1
Format: S32_LE
Channels: 2
Endpoint: 0x01 (1 OUT) (ASYNC)
Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000
Data packet interval: 125 us
Bits: 32
Channel map: FL FR
Sync Endpoint: 0x81 (1 IN)
Sync EP Interface: 1
Sync EP Altset: 1
Implicit Feedback Mode: No
Interface 1
Altset 2
Format: S16_LE
Channels: 2
Endpoint: 0x01 (1 OUT) (ASYNC)
Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000
Data packet interval: 125 us
Bits: 16
Channel map: FL FR
Sync Endpoint: 0x81 (1 IN)
Sync EP Interface: 1
Sync EP Altset: 2
Implicit Feedback Mode: No
Interface 1
Altset 3
Format: SPECIAL
Channels: 2
Endpoint: 0x01 (1 OUT) (ASYNC)
Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000
Data packet interval: 125 us
Bits: 32
DSD raw: DOP=0, bitrev=0
Channel map: FL FR
Sync Endpoint: 0x81 (1 IN)
Sync EP Interface: 1
Sync EP Altset: 3
Implicit Feedback Mode: No
Cheers,
Paul
On Wed, 26 Oct 2022 at 20:58, Ralf Mardorf <ralf.mardorf@xxxxxxxxxxxxx> wrote:
On Wed, 2022-10-26 at 20:24 +1300, Paul Dorman wrote:
> one of the USB3 ports
Hi,
did you test different USB ports?
> Whatever is causing it, the problem has persisted through OS upgrades
> and the switch from Pulseaudio to Pipewire.
I'm in favour of using plain ALSA or jackd. For testing purpose don't
use a sound server, test with plain ALSA.
Regards,
Ralf
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