Suspend power drain problems

[Ian Soboroff]

Anish Mistry <mistry.7 at osu.edu> writes:

> 	I've posted about this before, but now all the power management acpi 
> code seems to be imported and I've got a bit of time to test things 
> so I'll ask again.  My Fujitsu P2110 is able to suspend and resume 
> correctly and has been able to do it for quite some time now :).   
> The problem is that the battery drains abnormally fast verses when I 
> have it suspended in Windows 2000.  I'm using the acpi_video DPMS 
> patch that helps significantly, but after a day the battery is still 
> fully drained, where as with Windows it only dropped a few percent.
> 	I've got hw.pci.do_powerstate=1 set so I'm assuming the default power 
> management for pci devices is working, but this doesn't seem to help 
> my system.  To that end what can I do to debug this problem and tell 
> what devices aren't being shutoff and are draining the power?

I also have the same laptop (and the same problem) and am willing to
test fixes!

I first noticed this when I switched the laptop from Linux, where I
used to suspend with APM.  When Anish helped me get ACPI suspend to
work, I noticed that the battery drains much more quickly while
suspended under FreeBSD than under APM suspend from Linux.  (I can't
compare to ACPI suspend under Linux, I was never able to get that
work...)

Ian