Hi,

I'm trying to figure out how to get my USB headset (Plantronics C310)
to work.

I can't hear anything, nor does the microphone work. I fiddled with
different mixerctl settings to no avail, and I'm not even sure my
headset had been detected at all, as the available options to set
don't change, while I plug or unplug the device[1].

dmesg[2] happily reports it detected and configured the device:

uaudio0 at uhub0 port 1 configuration 1 interface 0 "Plantronics Plantronics 
C310" rev 2.00/1.35 addr 2
uaudio0: audio rev 1.00, 7 mixer controls
audio1 at uaudio0
uhidev1 at uhub0 port 1 configuration 1 interface 3 "Plantronics Plantronics 
C310" rev 2.00/1.35 addr 2
uhidev1: iclass 3/0, 42 report ids
uhid0 at uhidev1 reportid 1: input=1, output=0, feature=0
uhid1 at uhidev1 reportid 2: input=2, output=0, feature=0
uhid2 at uhidev1 reportid 3: input=32, output=32, feature=0
uhid3 at uhidev1 reportid 4: input=0, output=36, feature=0
uhid4 at uhidev1 reportid 5: input=32, output=0, feature=0
uhid5 at uhidev1 reportid 6: input=0, output=36, feature=0
uhid6 at uhidev1 reportid 7: input=32, output=0, feature=0
uhid7 at uhidev1 reportid 8: input=1, output=0, feature=0
uhid8 at uhidev1 reportid 9: input=0, output=1, feature=0
uhid9 at uhidev1 reportid 20: input=1, output=0, feature=0
uhid10 at uhidev1 reportid 21: input=2, output=0, feature=0
uhid11 at uhidev1 reportid 23: input=0, output=1, feature=0
uhid12 at uhidev1 reportid 24: input=0, output=1, feature=0
uhid13 at uhidev1 reportid 25: input=0, output=1, feature=0
uhid14 at uhidev1 reportid 26: input=0, output=1, feature=0
uhid15 at uhidev1 reportid 27: input=0, output=0, feature=2
uhid16 at uhidev1 reportid 30: input=0, output=1, feature=0
uhid17 at uhidev1 reportid 31: input=1, output=0, feature=0
uhid18 at uhidev1 reportid 32: input=0, output=1, feature=0
uhid19 at uhidev1 reportid 42: input=0, output=1, feature=0

Do you have an idea what else to try? Do you have experience with
similar hardware?

Best wishes,
Norman

[1] mixerctl -v

inputs.dac-0:1=126,126
inputs.dac-2:3=126,126
record.adc-2:3_mute=off  [ off on ]
record.adc-2:3=124,124
record.adc-0:1_mute=off  [ off on ]
record.adc-0:1=124,124
inputs.mix_source=mic2,spkr2,spkr3,beep  { mic2 spkr2 spkr3 beep }
inputs.mix_mic2=120,120
inputs.mix_spkr2=120,120
inputs.mix_spkr3=120,120
inputs.mix_beep=120,120
inputs.mix2_source=dac-0:1,mix  { dac-0:1 mix }
inputs.mix3_source=dac-2:3,mix  { dac-2:3 mix }
inputs.mic=85,85
outputs.spkr_source=mix3  [ mix2 mix3 ]
outputs.spkr_mute=off  [ off on ]
outputs.spkr_eapd=on  [ off on ]
outputs.hp_source=mix2  [ mix2 mix3 ]
outputs.hp_mute=off  [ off on ]
outputs.hp_boost=off  [ off on ]
outputs.hp_eapd=on  [ off on ]
outputs.mic2_source=mix2  [ mix2 mix3 ]
outputs.mic2_mute=off  [ off on ]
inputs.mic2=85,85
outputs.mic2_dir=input-vr80  [ none output input input-vr0 input-vr50 
input-vr80 input-vr100 ]
outputs.spkr2_source=mix2  [ mix2 mix3 ]
outputs.spkr2_mute=off  [ off on ]
inputs.spkr2=85,85
outputs.spkr2_dir=output  [ none output input input-vr0 input-vr50 input-vr80 
input-vr100 ]
outputs.spkr3_source=mix2  [ mix2 mix3 ]
outputs.spkr3_mute=off  [ off on ]
inputs.spkr3=85,85
outputs.spkr3_dir=output  [ none output input input-vr0 input-vr50 input-vr80 
input-vr100 ]
record.adc-0:1_source=mic2,spkr2,spkr3,beep,mix,mic  { mic2 spkr2 spkr3 beep 
mix mic }
record.adc-2:3_source=mic2,spkr2,spkr3,beep,mix  { mic2 spkr2 spkr3 beep mix }
outputs.hp_sense=unplugged  [ unplugged plugged ]
outputs.mic2_sense=unplugged  [ unplugged plugged ]
outputs.spkr_muters=hp,mic2  { hp mic2 }
outputs.master=126,126
outputs.master.mute=off  [ off on ]
outputs.master.slaves=dac-0:1,dac-2:3,spkr,hp,spkr2,spkr3  { dac-0:1 dac-2:3 
spkr hp mic2 spkr2 spkr3 }
record.volume=124,124
record.volume.mute=off  [ off on ]
record.volume.slaves=adc-2:3,adc-0:1  { adc-2:3 adc-0:1 mic mic2 spkr2 spkr3 }

[2] dmesg

OpenBSD 6.1-current (GENERIC.MP) #93: Thu Jul  6 15:41:21 MDT 2017
    dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 16846462976 (16066MB)
avail mem = 16330108928 (15573MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.7 @ 0xdae9d000 (70 entries)
bios0: vendor LENOVO version "G1ET73WW (2.09 )" date 10/19/2012
bios0: LENOVO 2349S1P
acpi0 at bios0: rev 2
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP SLIC TCPA SSDT SSDT SSDT HPET APIC MCFG ECDT FPDT ASF! 
UEFI UEFI POAT SSDT SSDT DMAR UEFI DBG2
acpi0: wakeup devices LID_(S4) SLPB(S3) IGBE(S4) EXP3(S4) XHCI(S3) EHC1(S3) 
EHC2(S3) HDEF(S4)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpihpet0 at acpi0: 14318179 Hz
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i5-3360M CPU @ 2.80GHz, 2794.07 MHz
cpu0: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,FSGSBASE,SMEP,ERMS,SENSOR,ARAT
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: TSC frequency 2794073520 Hz
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
cpu0: apic clock running at 99MHz
cpu0: mwait min=64, max=64, C-substates=0.2.1.1.2, IBE
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Core(TM) i5-3360M CPU @ 2.80GHz, 2793.66 MHz
cpu1: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,FSGSBASE,SMEP,ERMS,SENSOR,ARAT
cpu1: 256KB 64b/line 8-way L2 cache
cpu1: smt 1, core 0, package 0
cpu2 at mainbus0: apid 2 (application processor)
cpu2: Intel(R) Core(TM) i5-3360M CPU @ 2.80GHz, 2793.66 MHz
cpu2: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,FSGSBASE,SMEP,ERMS,SENSOR,ARAT
cpu2: 256KB 64b/line 8-way L2 cache
cpu2: smt 0, core 1, package 0
cpu3 at mainbus0: apid 3 (application processor)
cpu3: Intel(R) Core(TM) i5-3360M CPU @ 2.80GHz, 2793.66 MHz
cpu3: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,FSGSBASE,SMEP,ERMS,SENSOR,ARAT
cpu3: 256KB 64b/line 8-way L2 cache
cpu3: smt 1, core 1, package 0
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins
acpimcfg0 at acpi0 addr 0xf8000000, bus 0-63
acpiec0 at acpi0
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (PEG_)
acpiprt2 at acpi0: bus 2 (EXP1)
acpiprt3 at acpi0: bus 3 (EXP2)
acpiprt4 at acpi0: bus 4 (EXP3)
acpicpu0 at acpi0: C2(350@80 mwait.1@0x20), C1(1000@1 mwait.1), PSS
acpicpu1 at acpi0: C2(350@80 mwait.1@0x20), C1(1000@1 mwait.1), PSS
acpicpu2 at acpi0: C2(350@80 mwait.1@0x20), C1(1000@1 mwait.1), PSS
acpicpu3 at acpi0: C2(350@80 mwait.1@0x20), C1(1000@1 mwait.1), PSS
acpipwrres0 at acpi0: PUBS, resource for XHCI, EHC1, EHC2
acpitz0 at acpi0: critical temperature is 104 degC
acpibtn0 at acpi0: LID_
acpibtn1 at acpi0: SLPB
"LEN0071" at acpi0 not configured
"LEN0015" at acpi0 not configured
"SMO1200" at acpi0 not configured
acpibat0 at acpi0: BAT0 model "45N1005" serial 58752 type LION oem "LGC"
acpiac0 at acpi0: AC unit online
"LEN0078" at acpi0 not configured
acpithinkpad0 at acpi0
"PNP0C14" at acpi0 not configured
"PNP0C14" at acpi0 not configured
acpivideo0 at acpi0: VID_
acpivout at acpivideo0 not configured
acpivideo1 at acpi0: VID_
cpu0: Enhanced SpeedStep 2794 MHz: speeds: 2801, 2800, 2700, 2600, 2500, 2300, 
2200, 2100, 2000, 1900, 1800, 1700, 1500, 1400, 1300, 1200 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Core 3G Host" rev 0x09
inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics 4000" rev 0x09
drm0 at inteldrm0
inteldrm0: msi
inteldrm0: 1600x900, 32bpp
wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation)
wsdisplay0: screen 1-5 added (std, vt100 emulation)
xhci0 at pci0 dev 20 function 0 "Intel 7 Series xHCI" rev 0x04: msi
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 
addr 1
"Intel 7 Series MEI" rev 0x04 at pci0 dev 22 function 0 not configured
em0 at pci0 dev 25 function 0 "Intel 82579LM" rev 0x04: msi, address 
00:21:cc:d3:b5:bb
ehci0 at pci0 dev 26 function 0 "Intel 7 Series USB" rev 0x04: apic 2 int 16
usb1 at ehci0: USB revision 2.0
uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 
addr 1
azalia0 at pci0 dev 27 function 0 "Intel 7 Series HD Audio" rev 0x04: msi
azalia0: codecs: Realtek ALC269, Intel/0x2806, using Realtek ALC269
audio0 at azalia0
ppb0 at pci0 dev 28 function 0 "Intel 7 Series PCIE" rev 0xc4: msi
pci1 at ppb0 bus 2
sdhc0 at pci1 dev 0 function 0 "Ricoh 5U823 SD/MMC" rev 0x04: apic 2 int 16
sdhc0: SDHC 3.0, 50 MHz base clock
sdmmc0 at sdhc0: 4-bit, sd high-speed, mmc high-speed, dma
ppb1 at pci0 dev 28 function 1 "Intel 7 Series PCIE" rev 0xc4: msi
pci2 at ppb1 bus 3
rtwn0 at pci2 dev 0 function 0 "Realtek 8188CE" rev 0x01: msi
rtwn0: MAC/BB RTL8188CE, RF 6052 1T1R, address e0:06:e6:c7:79:ca
ppb2 at pci0 dev 28 function 2 "Intel 7 Series PCIE" rev 0xc4: msi
pci3 at ppb2 bus 4
ehci1 at pci0 dev 29 function 0 "Intel 7 Series USB" rev 0x04: apic 2 int 23
usb2 at ehci1: USB revision 2.0
uhub2 at usb2 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 
addr 1
pcib0 at pci0 dev 31 function 0 "Intel QM77 LPC" rev 0x04
ahci0 at pci0 dev 31 function 2 "Intel 7 Series AHCI" rev 0x04: msi, AHCI 1.3
ahci0: port 0: 6.0Gb/s
ahci0: port 1: 6.0Gb/s
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 0 lun 0: <ATA, KINGSTON SUV400S, 0C3F> SCSI3 0/direct 
fixed naa.0550380440010000
sd0: 228936MB, 512 bytes/sector, 468862128 sectors, thin
sd1 at scsibus1 targ 1 lun 0: <ATA, HGST HTS725050A7, GH2O> SCSI3 0/direct 
fixed naa.5000cca76cc03cc3
sd1: 476940MB, 512 bytes/sector, 976773168 sectors
ichiic0 at pci0 dev 31 function 3 "Intel 7 Series SMBus" rev 0x04: apic 2 int 18
iic0 at ichiic0
spdmem0 at iic0 addr 0x50: 8GB DDR3 SDRAM PC3-12800 SO-DIMM
spdmem1 at iic0 addr 0x51: 8GB DDR3 SDRAM PC3-12800 SO-DIMM
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
wsmouse0 at pms0 mux 0
wsmouse1 at pms0 mux 0
pms0: Synaptics touchpad, firmware 7.2
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
vmm0 at mainbus0: VMX/EPT
error: [drm:pid0:cpt_set_fifo_underrun_reporting] *ERROR* uncleared pch fifo 
underrun on pch transcoder A
error: [drm:pid0:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder A 
FIFO underrun
uhub3 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 
2.00/0.00 addr 2
umass0 at uhub3 port 2 configuration 1 interface 0 "JetFlash Mass Storage 
Device" rev 2.10/11.00 addr 3
umass0: using SCSI over Bulk-Only
scsibus2 at umass0: 2 targets, initiator 0
sd2 at scsibus2 targ 1 lun 0: <JetFlash, Transcend 8GB, 1100> SCSI4 0/direct 
removable serial.856410002T4SYEAMMWXC
sd2: 7532MB, 512 bytes/sector, 15425536 sectors
uhub4 at uhub2 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 
2.00/0.00 addr 2
uhidev0 at uhub4 port 5 configuration 1 interface 0 "Logitech USB-PS/2 Optical 
Mouse" rev 2.00/18.00 addr 3
uhidev0: iclass 3/1
ums0 at uhidev0: 6 buttons, Z dir
wsmouse2 at ums0 mux 0
vscsi0 at root
scsibus3 at vscsi0: 256 targets
softraid0 at root
scsibus4 at softraid0: 256 targets
sd3 at scsibus4 targ 1 lun 0: <OPENBSD, SR CRYPTO, 006> SCSI2 0/direct fixed
sd3: 250876MB, 512 bytes/sector, 513794592 sectors
softraid0: volume sd3 is roaming, it used to be sd4, updating metadata
sd4 at scsibus4 targ 2 lun 0: <OPENBSD, SR CRYPTO, 006> SCSI2 0/direct fixed
sd4: 184319MB, 512 bytes/sector, 377486832 sectors
softraid0: volume sd4 is roaming, it used to be sd5, updating metadata
root on sd4a (33a1ca46026d34ac.a) swap on sd4b dump on sd4b
sd2 detached
scsibus2 detached
umass0 detached
rtwn0: radio is disabled by hardware switch
rtwn0: could not power on adapter
uaudio0 at uhub0 port 1 configuration 1 interface 0 "Plantronics Plantronics 
C310" rev 2.00/1.35 addr 2
uaudio0: audio rev 1.00, 7 mixer controls
audio1 at uaudio0
uhidev1 at uhub0 port 1 configuration 1 interface 3 "Plantronics Plantronics 
C310" rev 2.00/1.35 addr 2
uhidev1: iclass 3/0, 42 report ids
uhid0 at uhidev1 reportid 1: input=1, output=0, feature=0
uhid1 at uhidev1 reportid 2: input=2, output=0, feature=0
uhid2 at uhidev1 reportid 3: input=32, output=32, feature=0
uhid3 at uhidev1 reportid 4: input=0, output=36, feature=0
uhid4 at uhidev1 reportid 5: input=32, output=0, feature=0
uhid5 at uhidev1 reportid 6: input=0, output=36, feature=0
uhid6 at uhidev1 reportid 7: input=32, output=0, feature=0
uhid7 at uhidev1 reportid 8: input=1, output=0, feature=0
uhid8 at uhidev1 reportid 9: input=0, output=1, feature=0
uhid9 at uhidev1 reportid 20: input=1, output=0, feature=0
uhid10 at uhidev1 reportid 21: input=2, output=0, feature=0
uhid11 at uhidev1 reportid 23: input=0, output=1, feature=0
uhid12 at uhidev1 reportid 24: input=0, output=1, feature=0
uhid13 at uhidev1 reportid 25: input=0, output=1, feature=0
uhid14 at uhidev1 reportid 26: input=0, output=1, feature=0
uhid15 at uhidev1 reportid 27: input=0, output=0, feature=2
uhid16 at uhidev1 reportid 30: input=0, output=1, feature=0
uhid17 at uhidev1 reportid 31: input=1, output=0, feature=0
uhid18 at uhidev1 reportid 32: input=0, output=1, feature=0
uhid19 at uhidev1 reportid 42: input=0, output=1, feature=0

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