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eGPU + USB Audio woes  

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elan
 elan
(@elan)
New Member
Joined: 1 year ago
 

Mac Mini late 2018
eGPU: BlackMagic eGPU Pro
Version: 10.14.5 (but also tried in beta 10.15)
DAC: Tried various, but mostly Cambridge Audio DACMagic 100

When the eGPU is being used, the USB sound engine is reset every few minutes, resulting in an audio dropout. Example logs:

default 09:01:46.518108 -1000 kernel USB Sound assertion (Resetting engine due to error returned in Write Handler) in /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleUSBAudio/AppleUSBAudio-315.6/AppleUSBAudioDevice.cpp at line 6520
default 09:03:06.124181 -1000 kernel USB Sound assertion (Frame Difference is greated than expected) in /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleUSBAudio/AppleUSBAudio-315.6/AppleUSBAudioStream.cpp at line 5208
default 09:03:06.321054 -1000 kernel USB Sound assertion (Resetting engine due to error returned in Write Handler) in /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleUSBAudio/AppleUSBAudio-315.6/AppleUSBAudioDevice.cpp at line 6520
default 09:03:06.321067 -1000 kernel USB Sound assertion (Resetting engine due to error returned to Feedback) in /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleUSBAudio/AppleUSBAudio-315.6/AppleUSBAudioDevice.cpp at line 6528

I've tried different USB cables, different USB ports, and plugging the USB DAC into:

- Internal USB port.
- eGPU USB port.
- Totally separate MiniDock's USB on separate Thunderbolt bus.

None of this seems to make a difference.

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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GPU_Cat
(@gpu_cat)
Active Member
Joined: 10 months ago
 

@elan

Did you ever solve this? I've noticed some audio dropouts when using my USB DAC. I'm connecting the DAC directly to the Mac on the right side, with the eGPU on the left side.

System: MacBook Pro 2016 13-inch

DAC: Schiit Modi 3 (USB)

eGPU: Razer Core X Chroma w/ AMD 5700

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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elan
 elan
(@elan)
New Member
Joined: 1 year ago
 

@gpu_cat I ended up using an HDMI to TOSLINK extraction device for a while, because I couldn't avoid the issue using any USB-based audio solution.

Then, after an OS update (10.15.1?) suddenly the issue disappeared and I'm back to using my external USB DAC happily.

So...all's well that ends well?

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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tobes
(@tobes)
New Member
Joined: 3 weeks ago
 

Hi, did you manage to shine any more light on the cause? I've got exactly the same problem (27" iMac, Razer Core, 5700XT, various USB peripherals including a DAC) but don't have the luxury of disconnecting that other USB kit.

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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elan
 elan
(@elan)
New Member
Joined: 1 year ago
 

@tobes, AFAIK the problem went away with a macOS upgrade.

 

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

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tobes
(@tobes)
New Member
Joined: 3 weeks ago
 

Thank you for getting back. I've seen mention of arguments between the iMac's T2 chip and USB audio, so I'm going to borrow a Thunderbolt 3 dock and see if I can use that to get round the problem - will report back.

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

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