[ltp] Aggressive Powersaving

Henrique de Moraes Holschuh linux-thinkpad@linux-thinkpad.org
Tue, 9 Feb 2010 15:43:05 -0200

On Tue, 09 Feb 2010, Pedro Ribeiro wrote:
> I read somewhere (forgot where) that sata power management shouldn't
> be messed with in hot swappable devices. But maybe that is not true on
> later kernels?

The link might not come up by itself on hotplug, but you do have a hook to
know when you need to kick it back up in this case, as the ACPI layer will
send an event about the hotplug.

> Actually now that I think about it, since I use the DVD drive quite
> sparingly, do you think it is a bad idea to have it on min_power all
> the time? Will it affect my ability to watch DVD's etc?

Well, at worst you will need to switch the SATA link to performance mode
manually and trigger a hotplug.  Unless there are bugs.  I can't test that,
as my T43 has a PATA bay.

  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh