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Old 06-26-2022, 10:00 PM   #1
asus_user
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Join Date: Jun 2022
Posts: 1
Default DisplayLink (ASUS MB16AH) USB-C device not recognised

A brand-new ASUS ZenScreen MB16AH bought as a replacement for an older USB screen does not want to connect via USB-C.

All the s/w is at its latest for the time of writing:

* OS: Ubuntu 22.04
* Kernel: 5.15.0-40-generic
* EVDI kernel: 1.11.0 of
* DisplayLink: 5.6.0-59.176

The screen works via HDMI, but shows no signal if connected via USB-C. The spec for my laptop says that all USB ports are USB 3.1. An older version of ASUS MB169B+ works just fine.

Running `journalctl -b` after connecting the monitor returns this log:

Jun 24 11:17:59 mx-zen kernel: usb 1-2: new full-speed USB device number 70 using xhci_hcd
Jun 24 11:17:59 mx-zen kernel: usb 1-2: device descriptor read/64, error -71
Jun 24 11:18:00 mx-zen kernel: usb 1-2: device descriptor read/64, error -71
Jun 24 11:18:00 mx-zen kernel: usb 1-2: new full-speed USB device number 71 using xhci_hcd
Jun 24 11:18:00 mx-zen kernel: usb 1-2: device descriptor read/64, error -71
Jun 24 11:18:00 mx-zen kernel: usb 1-2: device descriptor read/64, error -71
Jun 24 11:18:00 mx-zen kernel: usb usb1-port2: attempt power cycle
Jun 24 11:18:01 mx-zen kernel: usb 1-2: new full-speed USB device number 72 using xhci_hcd
Jun 24 11:18:01 mx-zen kernel: usb 1-2: Device not responding to setup address.
Jun 24 11:18:01 mx-zen kernel: usb 1-2: Device not responding to setup address.
Jun 24 11:18:01 mx-zen kernel: usb 1-2: device not accepting address 72, error -71
Jun 24 11:18:01 mx-zen kernel: usb 1-2: new full-speed USB device number 73 using xhci_hcd

and on it goes trying forever.

The monitor is definitely powered on as it displays the _no signal_ message and goes to sleep (amber light).
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Old 06-27-2022, 11:04 AM   #2
rboerner
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Join Date: Jan 2015
Posts: 196
Default

Quote:
Originally Posted by asus_user View Post
A brand-new ASUS ZenScreen MB16AH bought as a replacement for an older USB screen does not want to connect via USB-C.

All the s/w is at its latest for the time of writing:

* OS: Ubuntu 22.04
* Kernel: 5.15.0-40-generic
* EVDI kernel: 1.11.0 of
* DisplayLink: 5.6.0-59.176

The screen works via HDMI, but shows no signal if connected via USB-C. The spec for my laptop says that all USB ports are USB 3.1. An older version of ASUS MB169B+ works just fine.

Running `journalctl -b` after connecting the monitor returns this log:

Jun 24 11:17:59 mx-zen kernel: usb 1-2: new full-speed USB device number 70 using xhci_hcd
Jun 24 11:17:59 mx-zen kernel: usb 1-2: device descriptor read/64, error -71
Jun 24 11:18:00 mx-zen kernel: usb 1-2: device descriptor read/64, error -71
Jun 24 11:18:00 mx-zen kernel: usb 1-2: new full-speed USB device number 71 using xhci_hcd
Jun 24 11:18:00 mx-zen kernel: usb 1-2: device descriptor read/64, error -71
Jun 24 11:18:00 mx-zen kernel: usb 1-2: device descriptor read/64, error -71
Jun 24 11:18:00 mx-zen kernel: usb usb1-port2: attempt power cycle
Jun 24 11:18:01 mx-zen kernel: usb 1-2: new full-speed USB device number 72 using xhci_hcd
Jun 24 11:18:01 mx-zen kernel: usb 1-2: Device not responding to setup address.
Jun 24 11:18:01 mx-zen kernel: usb 1-2: Device not responding to setup address.
Jun 24 11:18:01 mx-zen kernel: usb 1-2: device not accepting address 72, error -71
Jun 24 11:18:01 mx-zen kernel: usb 1-2: new full-speed USB device number 73 using xhci_hcd

and on it goes trying forever.

The monitor is definitely powered on as it displays the _no signal_ message and goes to sleep (amber light).
Based on the information Asus provides for your specific model of display --> https://www.asus.com/Displays-Deskto...Screen-MB16AH/ the display does NOT appear to have DisplayLink technology inside. As a result, DisplayLink will not be able to help you.

If pressed to make a guess based on your description, I would suspect that your laptop does not support video output via its USB Type-C port which is why the display is not working when connected via a USB Type-C connection.

Asus speaks to this requirement on electronic page 9 of the manual for the display --> https://dlcdnets.asus.com/pub/ASUS/L...UM_English.pdf
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