This issue is still present in Ubuntu 20.04.3 LTS running the 5.4.0-81-generic kernel.
[ 0.725170] xhci_hcd 0000:02:00.0: xHCI Host Controller [ 0.725172] xhci_hcd 0000:02:00.0: new USB bus registered, assigned bus number 4 [ 0.725174] xhci_hcd 0000:02:00.0: Host supports USB 3.1 Enhanced SuperSpeed [ 0.725242] usb usb4: We don't know the algorithms for LPM for this host, disabling LPM. [ 0.725253] usb usb4: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.04 [ 0.725254] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 0.725255] usb usb4: Product: xHCI Host Controller [ 0.725255] usb usb4: Manufacturer: Linux 5.4.0-81-generic xhci-hcd [ 0.725256] usb usb4: SerialNumber: 0000:02:00.0 [ 0.725340] hub 4-0:1.0: USB hub found [ 0.725346] hub 4-0:1.0: 2 ports detected -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1804592 Title: usb usb2: We don't know the algorithms for LPM for this host, disabling LPM. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1804592/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
