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User profile for user: hclin5991
hclin5991 Author
User level: Level 1
5 points

Every time when connecting to my USB C hub, the process "usbd" starts to occupy CPU in %

Hello all,


Glad to have my new MacBook Air with M1 chip. It hasn't caused any defect to my experience in using USB C hub (model: Transcend HUB2C) but here is an issue: Every time I connect that hub to my Mac, I notice there is a process named "usbd" that starts to consume high percentage of CPU (%). Meanwhile, my Mac starts to get warmed. Once I forcefully quit usbd, my Mac freezes. I also spotted that with usbd quit, my USB hub is rather cool. I don't know why it happened as such case but I wonder if it is indicative that the hub would damage my Mac?? So much concern on that, please help! Thank you.


This is my hub:


MacBook Air 13″, macOS 11.4

Posted on Aug 13, 2021 10:05 AM

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User profile for user: hclin5991
hclin5991 Author
User level: Level 1
5 points

Posted on Aug 13, 2021 10:25 AM 

Date/Time:        2021-08-13 17:37:44.468 +0800
End time:         2021-08-13 17:39:51.096 +0800
OS Version:       macOS 11.4 (Build 20F71)
Architecture:     arm64e
Report Version:   32
Incident Identifier: 41A7A20A-796B-4558-A904-EA7AF44F949A

Data Source:      Microstackshots
Shared Cache:     DA77D7E4-88AC-3DFA-8D74-CEBA36827791 slid base address 0x1906a8000, slide 0x106a8000
Shared Cache:     9B070000-0040-0000-0000-000000000000 slide 0x14000

Command:          usbd
Path:             /usr/libexec/usbd
Version:          ??? (???)
Parent:           UNKNOWN [1]
PID:              413

Event:            cpu usage
Action taken:     none
CPU:              90 seconds cpu time over 127 seconds (71% cpu average), exceeding limit of 50% cpu over 180 seconds
CPU limit:        90s
Limit duration:   180s
CPU used:         90s
CPU duration:     127s
Duration:         126.63s
Duration Sampled: 123.71s
Steps:            54

Hardware model:   MacBookAir10,1
Active cpus:      8


This is the diagnosis report.

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User profile for user: hclin5991
hclin5991 Author
User level: Level 1
5 points

Aug 13, 2021 10:25 AM in response to hclin5991 

Date/Time:        2021-08-13 17:37:44.468 +0800
End time:         2021-08-13 17:39:51.096 +0800
OS Version:       macOS 11.4 (Build 20F71)
Architecture:     arm64e
Report Version:   32
Incident Identifier: 41A7A20A-796B-4558-A904-EA7AF44F949A

Data Source:      Microstackshots
Shared Cache:     DA77D7E4-88AC-3DFA-8D74-CEBA36827791 slid base address 0x1906a8000, slide 0x106a8000
Shared Cache:     9B070000-0040-0000-0000-000000000000 slide 0x14000

Command:          usbd
Path:             /usr/libexec/usbd
Version:          ??? (???)
Parent:           UNKNOWN [1]
PID:              413

Event:            cpu usage
Action taken:     none
CPU:              90 seconds cpu time over 127 seconds (71% cpu average), exceeding limit of 50% cpu over 180 seconds
CPU limit:        90s
Limit duration:   180s
CPU used:         90s
CPU duration:     127s
Duration:         126.63s
Duration Sampled: 123.71s
Steps:            54

Hardware model:   MacBookAir10,1
Active cpus:      8


This is the diagnosis report.

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Every time when connecting to my USB C hub, the process "usbd" starts to occupy CPU in %

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