HDParm/SDParm bug afects me as well with 2 different Seagate usb drives, I think this one should have a high priority, since it also affects power management. Further more since the aforementioned drive is also a sub-hub it would be good to be able to turn on/off the drive portion without needing to re-plug the usb-cable or the power-cable.

However I cannot confirm or deny if this behaviour was not observed in 17.04.

Seagate Backup+ Hub;

[733263.671304] usb 1-2: new full-speed USB device number 82 using xhci_hcd
[733263.927640] usb 2-2: new SuperSpeed USB device number 49 using xhci_hcd
[733263.953201] usb 2-2: New USB device found, idVendor=0bc2, idProduct=ab45
[733263.953206] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[733263.953209] usb 2-2: Product: Backup+ Hub
[733263.953211] usb 2-2: Manufacturer: Seagate
[733263.953214] usb 2-2: SerialNumber: 01CB7447B2D2
[733263.955412] hub 2-2:1.0: USB hub found
[733263.955699] hub 2-2:1.0: 3 ports detected
[733264.075319] usb 1-2: new high-speed USB device number 83 using xhci_hcd
[733264.226923] usb 1-2: New USB device found, idVendor=0bc2, idProduct=ab44
[733264.226928] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[733264.226931] usb 1-2: Product: Backup+ Hub
[733264.226934] usb 1-2: Manufacturer: Seagate
[733264.226936] usb 1-2: SerialNumber: 01CB7447B2D2
[733264.228162] hub 1-2:1.0: USB hub found
[733264.228426] hub 1-2:1.0: 3 ports detected
[733264.303425] usb 2-2.1: new SuperSpeed USB device number 50 using xhci_hcd
[733264.324224] usb 2-2.1: New USB device found, idVendor=0bc2, idProduct=ab38
[733264.324228] usb 2-2.1: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[733264.324232] usb 2-2.1: Product: Backup+ Hub BK
[733264.324234] usb 2-2.1: Manufacturer: Seagate
[733264.324236] usb 2-2.1: SerialNumber: NA8TS9K5
[733264.328836] scsi host6: uas
[733264.329274] scsi 6:0:0:0: Direct-Access     Seagate  Backup+ Hub BK   D781 PQ: 0 ANSI: 6
[733264.329760] sd 6:0:0:0: Attached scsi generic sg0 type 0
[733264.329875] sd 6:0:0:0: [sda] Spinning up disk...
[733265.291754] usb 1-2-port2: Cannot enable. Maybe the USB cable is bad?
[733265.363336] .
[733266.387390] .
[733267.411383] .
[733268.435283] .
[733269.459369] .
[733270.483306] .
[733271.507316] .
[733272.531296] .
[733273.559245] .
[733274.579343] .
[733275.603273] .
[733276.627270] .
[733276.628098] ready
[733276.628416] sd 6:0:0:0: [sda] 11721045167 512-byte logical blocks: (6.00 TB/5.46 TiB)
[733276.641757] sd 6:0:0:0: [sda] Write Protect is off
[733276.641759] sd 6:0:0:0: [sda] Mode Sense: 4f 00 00 00
[733276.641909] sd 6:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[733276.774212]  sda: sda1
[733276.775169] sd 6:0:0:0: [sda] Attached SCSI disk

Seagate Expansion Desk;

[733476.458208] usb 2-2: new SuperSpeed USB device number 52 using xhci_hcd
[733476.483130] usb 2-2: New USB device found, idVendor=0bc2, idProduct=3320
[733476.483137] usb 2-2: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[733476.483141] usb 2-2: Product: Expansion Desk
[733476.483145] usb 2-2: Manufacturer: Seagate
[733476.483149] usb 2-2: SerialNumber: NA4MBV5C
[733476.487448] scsi host6: uas
[733476.489027] scsi 6:0:0:0: Direct-Access     Seagate  Expansion Desk   0711 PQ: 0 ANSI: 6
[733476.489568] sd 6:0:0:0: Attached scsi generic sg0 type 0
[733476.489702] sd 6:0:0:0: [sda] Spinning up disk...
[733477.522122] .
[733478.546133] .
[733479.570122] .
[733480.594118] .
[733481.618115] .
[733482.642179] .
[733483.666088] .
[733484.690112] .
[733485.714083] .
[733486.738101] .
[733487.762049] .
[733488.786066] .
[733488.787214] ready
[733488.787477] sd 6:0:0:0: [sda] 976754645 4096-byte logical blocks: (4.00 TB/3.64 TiB)
[733488.803316] sd 6:0:0:0: [sda] Write Protect is off
[733488.803318] sd 6:0:0:0: [sda] Mode Sense: 4f 00 00 00
[733488.803468] sd 6:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[733488.869597]  sda: sda1
[733488.870488] sd 6:0:0:0: [sda] Attached SCSI disk

OnMemory USB-Core.
Th following drive gives a different "sparm/hdparm -i" and can be set to spindown and use power management and is smart capable.

[733625.017283] usb 2-2: new SuperSpeed USB device number 53 using xhci_hcd
[733625.037984] usb 2-2: New USB device found, idVendor=174c, idProduct=55aa
[733625.037988] usb 2-2: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[733625.037990] usb 2-2: Product: External HDD
[733625.037992] usb 2-2: Manufacturer: 01234567890123456789012345678901234567890123
[733625.037994] usb 2-2: SerialNumber: 201202152114
[733625.039122] usb-storage 2-2:1.0: USB Mass Storage device detected
[733625.039243] usb-storage 2-2:1.0: Quirks match for vid 174c pid 55aa: 400000
[733625.039267] scsi host6: usb-storage 2-2:1.0
[733635.521181] scsi 6:0:0:0: Direct-Access     TOSHIBA  DT01ACA300       MX6O PQ: 0 ANSI: 5
[733635.521835] sd 6:0:0:0: Attached scsi generic sg0 type 0
[733635.522015] sd 6:0:0:0: [sda] 732566646 4096-byte logical blocks: (3.00 TB/2.73 TiB)
[733635.522289] sd 6:0:0:0: [sda] Write Protect is off
[733635.522292] sd 6:0:0:0: [sda] Mode Sense: 23 00 00 00
[733635.522498] sd 6:0:0:0: [sda] No Caching mode page found
[733635.522505] sd 6:0:0:0: [sda] Assuming drive cache: write through
[733635.568550]  sda: sda1
[733635.569396] sd 6:0:0:0: [sda] Attached SCSI disk
[733636.783901] BTRFS info (device sda1): disk space caching is enabled