This bug keeps on hitting me. But in the meantime i've discovered some
things:
- hdparm seems not responsible for this problem and this bug can be
closed (or passed to kernel-team?).
- Looks like a problem with the firmware (drive?, laptop?) that activate
some energy saving mechanism without notifying the acpi subsystem. You
can find more infos, that i think are related, here:
https://wiki.archlinux.org/index.php/Samsung_N140 (SATA exceptions,
freeze, reset)
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/285892
- The Arch link reports a Suse kernel patch that seems to solve the
problem, but indeed it wasn't merged upstream.
- This freezes happens to a lot of people (Ubuntu link), many with
Samsung hardware (both laptop and hard disk or a combination of these).
- I don't know any workaround, but looks like these freezes are harmless
to the drive, even if they are logged by SMART. I haven't tried
disabling the apm=254, because i need it. Without it the drive parks
drive's heads too frequently, reducing its life.
- For me the freezes happens only (and not always) when hdparm set the
above apm property. But others see freezes in different situation, as
you can read in the links above.
Cesare.
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