[Bug 208357] snd-usb-audio broken for 06f8:b000 since 4.9.189

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https://bugzilla.kernel.org/show_bug.cgi?id=208357

--- Comment #5 from Alexander Chalikiopoulos (bugzilla.kernel.org@xxxxxxxxxxxxx) ---
In the current kernel, in /sys/kernel/debug/usb/devices, I see for this device:

T:  Bus=01 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#=  6 Spd=12   MxCh= 0
D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=06f8 ProdID=b000 Rev= 1.00
S:  Manufacturer=Hercules
S:  Product=Hercules DJ Console
C:* #Ifs= 9 Cfg#= 1 Atr=80 MxPwr=300mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)
E:  Ad=07(O) Atr=02(Bulk) MxPS=  16 Ivl=0ms
I:* If#= 1 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=00 Driver=usbhid
E:  Ad=83(I) Atr=03(Int.) MxPS=  20 Ivl=10ms
I:* If#= 2 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=00 Driver=usbhid
E:  Ad=84(I) Atr=03(Int.) MxPS=   4 Ivl=10ms
I:* If#= 3 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=00 Driver=usbhid
E:  Ad=85(I) Atr=03(Int.) MxPS=   8 Ivl=10ms
I:* If#= 4 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=snd-usb-audio
E:  Ad=06(O) Atr=02(Bulk) MxPS=   8 Ivl=0ms
E:  Ad=86(I) Atr=02(Bulk) MxPS=   8 Ivl=0ms
I:* If#= 5 Alt= 0 #EPs= 0 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)
I:  If#= 5 Alt= 1 #EPs= 1 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)
E:  Ad=01(O) Atr=09(Isoc) MxPS= 576 Ivl=1ms
I:  If#= 5 Alt= 2 #EPs= 1 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)
E:  Ad=81(I) Atr=0d(Isoc) MxPS= 288 Ivl=1ms
I:  If#= 5 Alt= 3 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)
E:  Ad=01(O) Atr=09(Isoc) MxPS= 576 Ivl=1ms
E:  Ad=81(I) Atr=0d(Isoc) MxPS= 288 Ivl=1ms
I:* If#= 6 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=snd-usb-audio
I:* If#= 7 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
I:  If#= 7 Alt= 1 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
I:* If#= 8 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
I:  If#= 8 Alt= 1 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio

I will try to find (or build) a kernel where this device works and document the
same.

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