[Bug 1804592] Re: usb usb2: We don't know the algorithms for LPM for this host, disabling LPM.

On "Linux redacted-ubuntu 5.8.0-36-generic #40~20.04.1-Ubuntu SMP Wed
Jan 6 10:15:55 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux"

dmesg | grep -C 2 "LPM"


[ 2.687696] xhci_hcd 0000:2a:00.1: Host supports USB 3.1 Enhanced SuperSpeed
[ 2.692298] scsi host4: ahci
[ 2.692527] usb usb2: We don't know the algorithms for LPM for this host, disabling LPM.
[ 2.696864] scsi host5: ahci
[ 2.699176] usb usb2: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.08
--
[ 2.796162] xhci_hcd 0000:2a:00.3: new USB bus registered, assigned bus number 4
[ 2.799843] xhci_hcd 0000:2a:00.3: Host supports USB 3.1 Enhanced SuperSpeed
[ 2.801657] usb usb4: We don't know the algorithms for LPM for this host, disabling LPM.
[ 2.803482] usb usb4: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.08
[ 2.805284] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
--
[ 2.840321] xhci_hcd 0000:2f:00.3: new USB bus registered, assigned bus number 6
[ 2.842044] xhci_hcd 0000:2f:00.3: Host supports USB 3.1 Enhanced SuperSpeed
[ 2.843791] usb usb6: We don't know the algorithms for LPM for this host, disabling LPM.
[ 2.845547] usb usb6: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.08
[ 2.847296] usb usb6: New USB device strings: Mfr=3, Product=2, SerialNumber=1

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https://bugs.launchpad.net/bugs/1804592

Title:
usb usb2: We don't know the algorithms for LPM for this host,
disabling LPM.

Status in linux package in Ubuntu:
Confirmed

Bug description:
[ 0.876087] usb usb2: We don't know the algorithms for LPM for this host, disabling LPM.
[ 0.876099] usb usb2: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 4.18
[ 0.876100] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 0.876101] usb usb2: Product: xHCI Host Controller
[ 0.876102] usb usb2: Manufacturer: Linux 4.18.0-10-generic xhci-hcd
[ 0.876103] usb usb2: SerialNumber: 0000:15:00.0
[ 0.876206] hub 2-0:1.0: USB hub found
[ 0.876215] hub 2-0:1.0: 4 ports detected

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