Hi,
> Next step would be to build a kernel with UAUDIO_DEBUG and see if the > driver reports too many errors. Below I send the kernel messages that I get during playing a song. I pasted the two cases: with default sndiod and with sndiod -z 4096. After that there's the dmesg with UAUDIO_DEBUG. Hope it might help. Many thanks Luca ========================================= debug msgs with default sndio ========================================= uaudio_set_params: rate 48000 -> 48000 (index 8) uaudio_set_params: rate = 48000 uaudio_set_params: rate 48000 -> 48000 (index 8) uaudio_set_params: rate = 48000 uaudio_req: type = 0xa1, req = 0x81, val = 0x201, index = 0x900, size = 2 uaudio_req: type = 0xa1, req = 0x81, val = 0x202, index = 0x900, size = 2 uaudio_req: type = 0xa1, req = 0x81, val = 0x100, index = 0x900, size = 1 uaudio_req: type = 0xa1, req = 0x81, val = 0x200, index = 0xa00, size = 2 uaudio_req: type = 0xa1, req = 0x81, val = 0x100, index = 0xa00, size = 1 uaudio_stream_open: play: blksz = 1920, rate = 48000, fps = 1000 uaudio_stream_open: spf = 0xf00000 in [0xef1000:0xf0f000] uaudio_stream_open: nframes_max = 11, nframes_mask = 0, maxpkt = 196 uaudio_stream_open: safe_blksz = 2048, nxfers = 4 uaudio_req: type = 0x22, req = 0x1, val = 0x100, index = 0x1, size = 3 uaudio_stream_open: rec: blksz = 960, rate = 48000, fps = 1000 uaudio_stream_open: spf = 0xf00000 in [0xef1000:0xf0f000] uaudio_stream_open: nframes_max = 11, nframes_mask = 0, maxpkt = 98 uaudio_stream_open: safe_blksz = 1024, nxfers = 4 uaudio_req: type = 0x22, req = 0x1, val = 0x100, index = 0x82, size = 3 uaudio_trigger: preparing uaudio_trigger: starting uaudio0: 3 null frames out of 11: incomplete record xfer uaudio_pdata_intr: xfer status = 6 uaudio_pdata_intr: xfer status = 6 uaudio_pdata_intr: xfer status = 6 uaudio_pdata_intr: xfer status = 6 uaudio_rdata_intr: xfer status = 6 uaudio_rdata_intr: xfer status = 6 uaudio_rdata_intr: xfer status = 6 uaudio_rdata_intr: xfer status = 6 uaudio_set_params: rate 48000 -> 48000 (index 8) uaudio_set_params: rate = 48000 uaudio_set_params: rate 48000 -> 48000 (index 8) uaudio_set_params: rate = 48000 uaudio_req: type = 0xa1, req = 0x81, val = 0x201, index = 0x900, size = 2 uaudio_req: type = 0xa1, req = 0x81, val = 0x202, index = 0x900, size = 2 uaudio_req: type = 0xa1, req = 0x81, val = 0x100, index = 0x900, size = 1 uaudio_req: type = 0xa1, req = 0x81, val = 0x200, index = 0xa00, size = 2 uaudio_req: type = 0xa1, req = 0x81, val = 0x100, index = 0xa00, size = 1 uaudio_stream_open: play: blksz = 1920, rate = 48000, fps = 1000 uaudio_stream_open: spf = 0xf00000 in [0xef1000:0xf0f000] uaudio_stream_open: nframes_max = 11, nframes_mask = 0, maxpkt = 196 uaudio_stream_open: safe_blksz = 2048, nxfers = 4 uaudio_req: type = 0x22, req = 0x1, val = 0x100, index = 0x1, size = 3 uaudio_stream_open: rec: blksz = 960, rate = 48000, fps = 1000 uaudio_stream_open: spf = 0xf00000 in [0xef1000:0xf0f000] uaudio_stream_open: nframes_max = 11, nframes_mask = 0, maxpkt = 98 uaudio_stream_open: safe_blksz = 1024, nxfers = 4 uaudio_req: type = 0x22, req = 0x1, val = 0x100, index = 0x82, size = 3 uaudio_trigger: preparing uaudio_trigger: starting uaudio0: 3 null frames out of 11: incomplete record xfer =================================================== no more msgs until Ctrl-C on the player, then this: =================================================== uaudio_pdata_intr: xfer status = 6 uaudio_pdata_intr: xfer status = 6 uaudio_pdata_intr: xfer status = 6 uaudio_pdata_intr: xfer status = 6 uaudio_rdata_intr: xfer status = 6 uaudio_rdata_intr: xfer status = 6 uaudio_rdata_intr: xfer status = 6 uaudio_rdata_intr: xfer status = 6 ========================================= debug msgs with sndio -z 4096 ========================================= uaudio_set_params: rate 48000 -> 48000 (index 8) uaudio_set_params: rate = 48000 uaudio_set_params: rate 48000 -> 48000 (index 8) uaudio_set_params: rate = 48000 uaudio_req: type = 0xa1, req = 0x81, val = 0x201, index = 0x900, size = 2 uaudio_req: type = 0xa1, req = 0x81, val = 0x202, index = 0x900, size = 2 uaudio_req: type = 0xa1, req = 0x81, val = 0x100, index = 0x900, size = 1 uaudio_req: type = 0xa1, req = 0x81, val = 0x200, index = 0xa00, size = 2 uaudio_req: type = 0xa1, req = 0x81, val = 0x100, index = 0xa00, size = 1 uaudio_stream_open: play: blksz = 4080, rate = 48000, fps = 1000 uaudio_stream_open: spf = 0xf00000 in [0xef1000:0xf0f000] uaudio_stream_open: nframes_max = 23, nframes_mask = 0, maxpkt = 196 uaudio_stream_open: safe_blksz = 4336, nxfers = 2 uaudio_req: type = 0x22, req = 0x1, val = 0x100, index = 0x1, size = 3 uaudio_stream_open: rec: blksz = 2040, rate = 48000, fps = 1000 uaudio_stream_open: spf = 0xf00000 in [0xef1000:0xf0f000] uaudio_stream_open: nframes_max = 23, nframes_mask = 0, maxpkt = 98 uaudio_stream_open: safe_blksz = 2168, nxfers = 2 uaudio_req: type = 0x22, req = 0x1, val = 0x100, index = 0x82, size = 3 uaudio_trigger: preparing uaudio_trigger: starting uaudio0: 3 null frames out of 23: incomplete record xfer uaudio_pdata_intr: xfer status = 6 uaudio_pdata_intr: xfer status = 6 uaudio_rdata_intr: xfer status = 6 uaudio_rdata_intr: xfer status = 6 ========================================== Dmesg with UAUDIO_DEBUG ========================================== OpenBSD 6.9-current (GENERIC.MP) #0: Wed May 12 10:54:30 CEST 2021 p...@noquiero.my.domain:/sys/arch/arm64/compile/GENERIC.MP real mem = 8418693120 (8028MB) avail mem = 8127590400 (7751MB) random: good seed from bootblocks mainbus0 at root: Raspberry Pi 4 Model B Rev 1.4 psci0 at mainbus0: PSCI 1.1, SMCCC 1.2 cpu0 at mainbus0 mpidr 0: ARM Cortex-A72 r0p3 cpu0: 48KB 64b/line 3-way L1 PIPT I-cache, 32KB 64b/line 2-way L1 D-cache cpu0: 1024KB 64b/line 16-way L2 cache cpu0: CRC32,ASID16 cpu1 at mainbus0 mpidr 1: ARM Cortex-A72 r0p3 cpu1: 48KB 64b/line 3-way L1 PIPT I-cache, 32KB 64b/line 2-way L1 D-cache cpu1: 1024KB 64b/line 16-way L2 cache cpu1: CRC32,ASID16 cpu2 at mainbus0 mpidr 2: ARM Cortex-A72 r0p3 cpu2: 48KB 64b/line 3-way L1 PIPT I-cache, 32KB 64b/line 2-way L1 D-cache cpu2: 1024KB 64b/line 16-way L2 cache cpu2: CRC32,ASID16 cpu3 at mainbus0 mpidr 3: ARM Cortex-A72 r0p3 cpu3: 48KB 64b/line 3-way L1 PIPT I-cache, 32KB 64b/line 2-way L1 D-cache cpu3: 1024KB 64b/line 16-way L2 cache cpu3: CRC32,ASID16 efi0 at mainbus0: UEFI 2.7 efi0: https://github.com/pftf/RPi4 rev 0x10000 smbios0 at efi0: SMBIOS 3.3.0 smbios0: vendor https://github.com/pftf/RPi4 version "UEFI Firmware v1.26" date 04/16/2021 smbios0: Raspberry Pi Foundation Raspberry Pi 4 Model B apm0 at mainbus0 "system" at mainbus0 not configured "axi" at mainbus0 not configured simplebus0 at mainbus0: "soc" bcmclock0 at simplebus0 bcmmbox0 at simplebus0 bcmgpio0 at simplebus0 bcmaux0 at simplebus0 ampintc0 at simplebus0 nirq 256, ncpu 4 ipi: 0, 1: "interrupt-controller" bcmtmon0 at simplebus0 bcmdmac0 at simplebus0: DMA0 DMA2 DMA4 DMA5 DMA6 DMA7 DMA8 DMA9 "timer" at simplebus0 not configured pluart0 at simplebus0: console com0 at simplebus0: ns16550, no working fifo "local_intc" at simplebus0 not configured bcmdog0 at simplebus0 bcmirng0 at simplebus0 "firmware" at simplebus0 not configured "power" at simplebus0 not configured "mailbox" at simplebus0 not configured sdhc0 at simplebus0 sdhc0: SDHC 3.0, 250 MHz base clock sdmmc0 at sdhc0: 4-bit, sd high-speed, mmc high-speed "gpiomem" at simplebus0 not configured "fb" at simplebus0 not configured "vcsm" at simplebus0 not configured "clocks" at mainbus0 not configured "phy" at mainbus0 not configured "clk-27M" at mainbus0 not configured "clk-108M" at mainbus0 not configured simplebus1 at mainbus0: "emmc2bus" sdhc1 at simplebus1 sdhc1: SDHC 3.0, 100 MHz base clock sdmmc1 at sdhc1: 8-bit, sd high-speed, mmc high-speed, ddr52, dma "arm-pmu" at mainbus0 not configured agtimer0 at mainbus0: 54000 kHz simplebus2 at mainbus0: "scb" bcmpcie0 at simplebus2 pci0 at bcmpcie0 ppb0 at pci0 dev 0 function 0 "Broadcom BCM2711" rev 0x10 pci1 at ppb0 bus 1 xhci0 at pci1 dev 0 function 0 "VIA VL805 xHCI" rev 0x01: intx, xHCI 1.0 usb0 at xhci0: USB revision 3.0 uhub0 at usb0 configuration 1 interface 0 "VIA xHCI root hub" rev 3.00/1.00 addr 1 bse0 at simplebus2: address dc:a6:32:ed:1d:42 brgphy0 at bse0 phy 1: BCM54210E 10/100/1000baseT PHY, rev. 2 "dma" at simplebus2 not configured "hevc-decoder" at simplebus2 not configured "rpivid-local-intc" at simplebus2 not configured "h264-decoder" at simplebus2 not configured "vp9-decoder" at simplebus2 not configured "leds" at mainbus0 not configured "sd_io_1v8_reg" at mainbus0 not configured "sd_vcc_reg" at mainbus0 not configured "fixedregulator_3v3" at mainbus0 not configured "fixedregulator_5v0" at mainbus0 not configured simplebus3 at mainbus0: "v3dbus" "bootloader" at mainbus0 not configured dt: 443 probes scsibus0 at sdmmc1: 2 targets, initiator 0 sd0 at scsibus0 targ 1 lun 0: <SD/MMC, SC64G, 0080> removable sd0: 60906MB, 512 bytes/sector, 124735488 sectors uhub1 at uhub0 port 1 configuration 1 interface 0 "VIA Labs USB2.0 Hub" rev 2.10/4.21 addr 2 bwfm0 at sdmmc0 function 1 manufacturer 0x02d0, product 0xa9a6 at sdmmc0 function 2 not configured manufacturer 0x02d0, product 0xa9a6 at sdmmc0 function 3 not configured uaudio0 at uhub1 port 3 configuration 1 interface 1 "C-Media Electronics Inc. USB Audio Device" rev 1.10/1.00 addr 3 uaudio_process_ac: ifnum = 0, 235 bytes to processs uaudio_process_header: version 0x100 01: in, nch = 2, term = 0x101, assoc = 0 02: in, nch = 1, term = 0x201, assoc = 0 13: feature id = 2, nch = 1, size = 1 mute[-1] uaudio_req: type = 0xa1, req = 0x82, val = 0x200, index = 0xd00, size = 2 uaudio_req: type = 0xa1, req = 0x83, val = 0x200, index = 0xd00, size = 2 uaudio_req: type = 0xa1, req = 0x84, val = 0x200, index = 0xd00, size = 2 [-5888:2048]/256 (7937 vals) level[-1] 15: mixer, nch = 2: 09: feature id = 15, nch = 2, size = 1 mute[-1] uaudio_req: type = 0xa1, req = 0x82, val = 0x201, index = 0x900, size = 2 uaudio_req: type = 0xa1, req = 0x83, val = 0x201, index = 0x900, size = 2 uaudio_req: type = 0xa1, req = 0x84, val = 0x201, index = 0x900, size = 2 [-9472:0]/256 (9473 vals) level[0] uaudio_req: type = 0xa1, req = 0x82, val = 0x202, index = 0x900, size = 2 uaudio_req: type = 0xa1, req = 0x83, val = 0x202, index = 0x900, size = 2 uaudio_req: type = 0xa1, req = 0x84, val = 0x202, index = 0x900, size = 2 [-9472:0]/256 (9473 vals) level[1] 06: out, id = 9, nch = 2, term = 0x301, assoc = 0 10: feature id = 2, nch = 1, size = 1 mute[-1] uaudio_req: type = 0xa1, req = 0x82, val = 0x200, index = 0xa00, size = 2 uaudio_req: type = 0xa1, req = 0x83, val = 0x200, index = 0xa00, size = 2 uaudio_req: type = 0xa1, req = 0x84, val = 0x200, index = 0xa00, size = 2 [-3072:5888]/256 (8961 vals) level[-1] agc[-1] 08: selector, nch = 1 07: out, id = 8, nch = 1, term = 0x101, assoc = 0 uaudio0: units list: 10: feature <record>, src = 02 <input>, dst = 08 <record>, cls = 1 08: selector <record>: 08: source 10 <record>: 07: output <record>, source = 08 <record> 02: input <input>, dest = 10 <record> 13: feature <output_input>, src = 02 <input>, dst = 15 <output>, cls = 1 01: input <dac>, dest = 15 <output> 15: mixer <output>: 15: source 1 <dac>: 15: source 13 <output_input>: 09: feature <output>, src = 15 <output>, dst = 06 <output>, cls = 0 06: output <output>, source = 09 <output> uaudio0: mixer controls: 10: record.agc 10: record.level 10: record.mute 13: output_input.level 13: output_input.mute 09: output.level[0] 09: output.level[1] 09: output.mute uaudio_process_conf: stop altnum 0 uaudio_process_as_ep: addr = 0x1, adapt/data, maxpktsz = 200, ival = 1 uaudio_process_conf: stop altnum 0 uaudio_process_as_ep: addr = 0x82, sync/data, maxpktsz = 100, ival = 1 uaudio_process_conf: skipped iface 00: <outputs>, next = -1, prev = -1, class = -1 01: <inputs>, next = -1, prev = -1, class = -1 uaudio_req: type = 0xa1, req = 0x81, val = 0x700, index = 0xa00, size = 1 02: <record_agc>, next = -1, prev = -1, class = 1, members: off(=0) on(=1), val = 1 uaudio_req: type = 0xa1, req = 0x81, val = 0x200, index = 0xa00, size = 2 03: <record>, next = -1, prev = -1, class = 1, nch = 1, delta = 1, val = 146 uaudio_req: type = 0xa1, req = 0x81, val = 0x100, index = 0xa00, size = 1 04: <record_mute>, next = -1, prev = -1, class = 1, members: off(=0) on(=1), val = 0 uaudio_req: type = 0xa1, req = 0x81, val = 0x200, index = 0xd00, size = 2 05: <output_input>, next = -1, prev = -1, class = 1, nch = 1, delta = 1, val = 132 uaudio_req: type = 0xa1, req = 0x81, val = 0x100, index = 0xd00, size = 1 06: <output_input_mu>, next = -1, prev = -1, class = 1, members: off(=0) on(=1), val = 1 uaudio_req: type = 0xa1, req = 0x81, val = 0x201, index = 0x900, size = 2 uaudio_req: type = 0xa1, req = 0x81, val = 0x202, index = 0x900, size = 2 07: <output>, next = -1, prev = -1, class = 0, nch = 2, delta = 1, val = 186 186 uaudio_req: type = 0xa1, req = 0x81, val = 0x100, index = 0x900, size = 1 08: <output_mute>, next = -1, prev = -1, class = 0, members: off(=0) on(=1), val = 0 9 controls alts: mode = play, ifnum = 1, altnum = 1, addr = 0x1, maxpkt = 200, sync = 0x0, nch = 2, fmt = s16le2, rates: 44100 48000 mode = rec, ifnum = 2, altnum = 1, addr = 0x82, maxpkt = 100, sync = 0x0, nch = 1, fmt = s16le2, rates: 44100 48000 parameters: pchan = 2, s16le2, rchan = 1, s16le2, rates: 44100 48000 uaudio0: class v1, full-speed, sync, channels: 2 play, 1 rec, 8 ctls audio0 at uaudio0 uhidev0 at uhub1 port 3 configuration 1 interface 3 "C-Media Electronics Inc. USB Audio Device" rev 1.10/1.00 addr 3 uhidev0: iclass 3/0 uhid0 at uhidev0: input=4, output=4, feature=0 vscsi0 at root scsibus1 at vscsi0: 256 targets softraid0 at root scsibus2 at softraid0: 256 targets root on sd0a (33593fb538f83769.a) swap on sd0b dump on sd0b WARNING: clock lost 25 days WARNING: CHECK AND RESET THE DATE! gpio0 at bcmgpio0: 58 pins bwfm0: address dc:a6:32:ed:1d:43 WARNING: can't update clock chip time
