Bug 201235

Summary: ZOOM H2n Audio IF (4CH multi-track): kernel: usb 3-14: Warning! Unlikely big volume range (=32767), cval->res is probably wrong.
Product: Drivers Reporter: Ulrich.Windl (Ulrich.Windl)
Component: Sound(ALSA)Assignee: Jaroslav Kysela (perex)
Status: NEW ---    
Severity: low CC: kernel.org
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 4.4.155 Subsystem:
Regression: No Bisected commit-id:

Description Ulrich.Windl 2018-09-25 20:16:30 UTC 
Similar to bug #72511 I get this message for a ZOOM H2n USB audio interface in 24bit multichannel mode (new in firmware 3.0):
Sep 25 20:42:50 i7 kernel: usb 3-14: new high-speed USB device number 11 using xhci_hcd
Sep 25 20:42:51 i7 mtp-probe[5188]: checking bus 3, device 11: "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-14"
Sep 25 20:42:51 i7 kernel: usb 3-14: New USB device found, idVendor=1686, idProduct=01c5
Sep 25 20:42:51 i7 kernel: usb 3-14: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Sep 25 20:42:51 i7 kernel: usb 3-14: Product: H2n
Sep 25 20:42:51 i7 kernel: usb 3-14: Manufacturer: ZOOM Corporation
Sep 25 20:42:51 i7 kernel: usb 3-14: SerialNumber: 000000000000
Sep 25 20:42:51 i7 mtp-probe[5188]: bus: 3, device: 11 was not an MTP device
Sep 25 20:42:51 i7 kernel: usb 3-14: Warning! Unlikely big volume range (=32767), cval->res is probably wrong.
Sep 25 20:42:51 i7 kernel: usb 3-14: [5] FU [Mic Capture Volume] ch = 4, val = -32767/0/1
Sep 25 20:42:51 i7 kernel: usbcore: registered new interface driver snd-usb-audio

Some details from alsa-info:
Card: ZOOM Corporation H2n at usb-0000:00:14.0-10.2, high speed
  Unit: 5
    Control: name="Mic Capture Volume", index=0
    Info: id=5, control=2, cmask=0xf, channels=4, type="S16"
    Volume: min=-32767, max=0, dBmin=-12799, dBmax=0
  Unit: 5
    Control: name="Mic Capture Switch", index=0
    Info: id=5, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
    Volume: min=0, max=1, dBmin=0, dBmax=0

Card hw:2 'H2n'/'ZOOM Corporation H2n at usb-0000:00:14.0-10.2, high speed'
  Mixer name    : 'USB Mixer'
  Components    : 'USB1686:01c5'
  Controls      : 4
  Simple ctrls  : 1
Simple mixer control 'Mic',0
  Capabilities: cvolume cswitch cswitch-joined
  Capture channels: Front Left - Front Right - Rear Left - Rear Right
  Limits: Capture 0 - 32767
  Front Left: Capture 32767 [100%] [0.00dB] [on]
  Front Right: Capture 32767 [100%] [0.00dB] [on]
  Rear Left: Capture 32767 [100%] [0.00dB] [on]
  Rear Right: Capture 32767 [100%] [0.00dB] [on]