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Multiple USB cables

I have two USB-63 cables from RT Systems.

they are simple USB to Serial port converters.

When I insert both cables only one cable shows in the list of USB devices.

edgelinux01:~ % dmesg|grep RT
[ 0.000000] ACPI: BGRT 0x0000000079B7FEC0 000038 (v00 \xf3\xee 01072009 AMI 00010013)
[ 0.000000] ACPI: BERT 0x0000000079B803A8 000030 (v01 AMI AMI.BERT 00000000 AMI. 00000000)
[ 0.048003] RTC time: 19:01:48, date: 05/13/19
[ 1.012171] rtc_cmos 00:06: RTC can wake from S4
[ 1.043362] MODSIGN: Couldn't get UEFI MokListRT
[ 1.489018] usb 1-4: Manufacturer: RT Systems
[ 1.489020] usb 1-4: SerialNumber: RT1CKOJR
[ 2.064606] usb 1-8: Manufacturer: RT Systems
[ 2.064616] usb 1-8: SerialNumber: RT3NQYRZ

adding photo of USB connections.

Uploaded files:
  • antletusb.jpg

also with the second cable connected I cannot start the original VM that was working.

 

attached photo

Uploaded files:
  • antlet-cannot-start.jpg