[ltp] Powermanagement - serial ports

[Henrique de Moraes Holschuh]

On Wed, 17 Jun 2009, Michael Karcher wrote:
> Am Mittwoch, den 17.06.2009, 15:58 +0200 schrieb Nils Faerber:
> > I just noticed on my T42p that under Windows (2k pro) the serial (RS232)
> > ports are not powered until an application accesses them. Under Linux
> > they are powered all the time.
> > This will not draw much power but it is another mA or two that could be
> > saved. I just wonder how this could be done?
> Look for ACPI power resources. There should be one for the serial ports.

There is only one ACPI power resource in T4x ThinkPads ("PUBS") for the USB
ports, AFAIK.  If you have more, please tell me about it :)

However, PNPBIOS can probably turn the ports on and off, and that *might*
power them down.  Or not.

-- 
  "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