Bug 215073

Summary:	Audio underrun in FTDI driver
Product:	Drivers	Reporter:	Ross Wardrup (minorsecond)
Component:	Sound(ALSA)	Assignee:	Jaroslav Kysela (perex)
Status:	RESOLVED INVALID
Severity:	normal
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	5.15	Subsystem:
Regression:	No	Bisected commit-id:

Description Ross Wardrup 2021-11-19 13:27:32 UTC

When using the Digimode-4-Yaesu device in the link below, an "audio output data underrun" error occurs when the device is outputting audio. Received (input) audio works as expected. The issue does not occur in kernel 5.10 but does in 5.15.

http://xggcomms.com/Yaesu-Interface-Shop(2066629).html

Below is some info about the device and driver.


T:  Bus=01 Lev=03 Prnt=09 Port=01 Cnt=02 Dev#= 12 Spd=12   MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=0403 ProdID=6001 Rev= 6.00
S:  Manufacturer=FTDI
S:  Product=FT232R USB UART
S:  SerialNumber=AG6JN65M
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr= 90mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=ftdi_sio
E:  Ad=81(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms

Comment 1 Ross Wardrup 2021-11-20 16:24:23 UTC

This description is incorrect and this bug report should be closed. New bug report at https://bugzilla.kernel.org/show_bug.cgi?id=215085