hdparm -C seems to work on the PATA laptops I have,
but it always returns standby on the SATA laptops I have.
Is this a known issue?
Yes, due to incomplete implemetation of the HDIO_* ioctls in libata.
Somebody else posted a patch here recently to fix it.
I don't know if Jeff picked it up or not.
Correction on that. Jeff has indeed picked up the fix,
as of his "pull" request on Ocober 11:
Eran Tromer:
libata: return sense data in HDIO_DRIVE_CMD ioctl
Cheers
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