S3 on a Sony VGN-A290

[Anish Mistry]

On Friday 10 December 2004 08:36 am, Josef Karthauser wrote:
> Grump.  I leave my new Sony in S3 and come back to it in the morning to
> find that it's run out of battery :/.  I thought that S3 was a low
> energy state.  Anyone else got a similar machine?  Is it a problem with
> the machine or our ACPI?  (I'm running RELENG_5 on it).
>
> Joe
>
> ps. I remember some talk a while ago about a native S4 implementation -
> FreeBSD suspend to disk.  Has there been any progress in this direction?
This depends on what the ACPI on your systems does.  It sounds like it is 
similar to my P2110 and that the video adpater isn't turned off, 
eventhough the backlight goes off when the system goes into S3.  I'm using 
the acpi_video DPMS patch posted a while back and significantly reduces 
the power drain while in S3, but there must still be some devices that 
aren't getting powered down since the power drain when compared to Windows 
2000, is still much higher.  For example in Windows I can leave the system 
suspended on battery for 2 days and only see a few percent drop in the 
battery level, where as FreeBSD 6-CURRENT I can only leave it suspended 
for about a day before it kills off the battery.
The PCI power state transition code recently added didn't show any affect, 
but that was with an older kernel, I'll try again this weekend and double 
check the compenets are actually entering D3.
-- 
Anish Mistry
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