Hi,
On Monday, 11 September 2006 15:46, Stefan Seyfried wrote:
> Today i finally managed to set up and test userspace suspend. Everything
> seems to work somehow (some strange things i need to investigate, e.g.
> compressed suspend is actually slower than uncompressed).
Hm, this doesn't reflect my experience. ;-)
> But i found one
> real showstopper: according to the code and the obvious behaviour, suspend
> uses the equivalent of "shutdown" in /sys/power/disk, means: it writes the
> image to disk and then just powers off. This breaks many machines badly,
> especially my hp nx5000 where neither Battery nor AC adapter state will work
> properly after resume. Other machines might just resume slower (many machines
> actually seem to skip a lot of BIOS-foo on resume with "platform" mode), or
> have no negative side effects at all, but many HPs will lose battery
> information (and on the ThinkPads, the moon will not blink during suspend :-)
>
> What can we do to fix this? In-kernel suspend calls the apropriate ACPI
> methods at the beginning and end of suspend IIUC. Can we do something
> similar from userspace?
Generally, yes, but we'll need to add an additional ioctl for this purpose.
I thought we'd have to add it at some point, but I'm not sure what Pavel
thinks about it.
Greetings,
Rafael
--
You never change things by fighting the existing reality.
R. Buckminster Fuller
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