USB scan fails on Ubuntu 20.04

[jakobbraun]

Describe the bug

I'm trying to discover my UNI_T UT71B using SmuView-0.0.5-x86_64.AppImage but it does not show my USB device. However, if I specify the device via --driver=uni-t-ut71b:conn=1a86.e008 everything works fine.

To Reproduce
Steps to reproduce the behavior:

1. Open smuview
2. Click on add device button
3. Choose UNI_T UT71B (uni-t ut71b) driver
4. select USB
5. Click on Scan for devices using driver above
   Expected behavior
   My device shows up in the list

Screenshots or log

command line output of ./SmuView-0.0.5-x86_64.AppImage -l5

Enviroment:

• SmuView-0.0.5-x86_64.AppImage
• Ubuntu 20.04

Additional Information

• I did also try to it from a root shell top check if it's a permission problem, but i showed the same behavior.

[knarfS]

Unfortunately, the auto scan feature doesn't work with the UT-D04 cable/adapter you are using: There is AFAIK no save way do auto detect the Uni-t DMMs and all the adapter combinations. See https://github.com/sigrokproject/libsigrok/blob/master/README.devices#L305.

Therefor you have to specify your device driver and the USB-ID via the SmuView -d parameter or in the connection dialog. In the connection dialog you have to select "Serial Port" and enter (or select?) the USB-ID 1a86.e008 there.