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With udisksctl I'm able to power-off device: udisksctl power-off --block-device /dev/sdd

But how can I power it back ON from commandline?

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    There is no command to power on a previously powered off device. The workaround is to rescan for the device. – fpmurphy Sep 4 '17 at 5:59
  • @fpmurphy what exactly should one do to "rescan for the device"? (e.g. if one's /usb4/power/runtime_status is "suspended", not "active". ) – ged Jun 25 '19 at 18:51
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$ rmmod ehci_platform
$ modprobe ehci_platform

did the trick for me.

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    Hello greg. To help future readers it would be useful for you to expand your answer to explain what this does, and why it helped. – roaima Feb 10 '19 at 9:03

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