High Sierra breaks Magewell USB Capture HDMI Plus Audio

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Level 1

10 points

High Sierra breaks Magewell USB Capture HDMI Plus Audio

So I have a Magewell USB Capture HDMI Plus

http://www.magewell.com/usb-capture-hdmi-plus

Driverless, class compliant HDMI video capture. Worked just fine under Sierra. But suddenly the HDMI audio input is missing under High Sierra. In Console I see these errors when I plug it in. Looks like a kernel error introduced in High Sierra:

default	2017-09-27 00:03:08.858386 -0400	kernel	USB Sound assertion (Couldn't get the endpoint direction!) in /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleUSBAudio/AppleUSBAudio-310 .35/AppleUSBAudioStream.cpp at line 2744
default	2017-09-27 00:03:08.858398 -0400	kernel	USB Sound assertion in /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleUSBAudio/AppleUSBAudio-310 .35/AppleUSBAudioStream.cpp at line 2745
default	2017-09-27 00:03:08.858405 -0400	kernel	USB Sound assertion in /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleUSBAudio/AppleUSBAudio-310 .35/AppleUSBAudioEngine.cpp at line 1354
default	2017-09-27 00:03:08.858451 -0400	kernel	USB Sound assertion in /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleUSBAudio/AppleUSBAudio-310 .35/AppleUSBAudioDevice.cpp at line 1375
default	2017-09-27 00:03:08.858460 -0400	kernel	USB Sound assertion in /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleUSBAudio/AppleUSBAudio-310 .35/AppleUSBAudioDevice.cpp at line 534
default	2017-09-27 00:03:08.858467 -0400	kernel	USB Sound assertion in /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleUSBAudio/AppleUSBAudio-310 .35/AppleUSBAudioDevice.cpp at line 280

So what do I do now? I tried a System Management reset.

iMac (27-inch, Late 2012), macOS High Sierra (10.13), null

Posted on Sep 26, 2017 9:12 PM

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Answer 1

Rudegar

Level 10

180,120 points

Nov 1, 2017 8:58 AM in response to Neil Stevens

all usb devices require a device driver

for some std usb things there are generic drivers

for the rest the manufacture of the usb device makes the driver

if they hand in drivers for the operating system makers such as ms and apple

who in term test their stability and compliance the drivers may be included in the operating system install

if they don't the user of the device is required to go to the manufactures site and download the driver in order

to get the device working, if an operating system is upgraded there are times where a new driver is required

in order for the device to work, so if magewell did not supply a driver then you relay on going to their site and download their driver to get it to work, if they have of yet to have made the driver you need to wait for them, if they choose not to support the newer operating system your option is to downgrade macOS or get another device than magewell to resolve your needs or look for third party enthusiasts customer drivers which may or may not exist and may be unstable or perfectly stable but only supported by same enthusiasts

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