sony-vaio-z-series team mailing list archive

[Norbert Preining <preining@xxxxxxxx>]

On Mi, 17 Jun 2009, Mario wrote:
> I really don't understand the use of the sysfs control to switch from
> speed to stamina (and viceversa). What happens at hardware level if I

some magic codes are thrown at the PCI/ACPI bus that makes the hardware
(at least the nvidia as far as I see) being turned off completely.

> physically switch the hardware button? Which hardware is automatically

The primary card is selected, but the other one is not completely
switched off.

> influenced by this action? I understood that it was just an hardware
> button and that the software (sony module and our scripts) are supposed
> to apply the changes. I is not clear to me.

Not completely. There is some ACPI/BIOS magic that selects the card at
boot time. 

Nobody here (AFAIK) knows how hot-switching does work with Vista.

Best wishes

Norbert

-------------------------------------------------------------------------------
Dr. Norbert Preining <preining@xxxxxxxx>        Vienna University of Technology
Debian Developer <preining@xxxxxxxxxx>                         Debian TeX Group
gpg DSA: 0x09C5B094      fp: 14DF 2E6C 0307 BE6D AD76  A9C0 D2BF 4AA3 09C5 B094
-------------------------------------------------------------------------------
KENT (adj.)
Politely determined not to help despite a violent urge to the
contrary. Kent expressions are seen on the faces of people who are
good at something watching someone else who can't do it at all.
			--- Douglas Adams, The Meaning of Liff