Re: Crash on suspend
On Wed, Aug 15, 2001 at 01:17:31PM +0100, Vivek wrote:
> > > Slight correction - you need the hibernate partition to enter hibernate mode
> > > - you should be ablt to suspend just fine without it.
> >
> > I may be confused here - but wouldn't that be standby mode?
>
> No - standby and suspend are distinct: In standby mode the machine is till
> on, the kernel is still ticking away, but some (possibly only fuzzily
> defined) power saving things, like spinning the HD down, turning off the
> monitor, clocking the CPU down, etc have happened.
>
> In suspend mode, the machine is almost off - just enough power is consumed
> to keep the memory alive, and pretty much everything else is off. [There may be
> a trickle of power to things like the NIC, so wake-on-lan type things can
> happen].
>
> In hibernate mode, the memory+videomem [as you say] is flushed to permanent
> storage, and not even the memory is powered - The BIOS knows how to read the
> state back from storage into memory, and the kernel knows how to come back
> to life from there.
>
> You may have been confused by the 'swsusp' project, which achieves something
> similar to hibernation. I think it works by having a kernel that can boot
> very quickly with a 'memory-image' file: The kernel flushes data to disk and
> shuts down - then when it comes back, it detects the file, and instead of
> going through the normal boot process, slurps the file into memory and takes
> a running jump back to wherever it was when you shut down.
>
> Same effect as hibernation, but no BIOS/APM/ACPI support is required.
>
> Standby mode is, AFAIK, not often used, at least not explicitly by the user,
> and has little impact on the user anyway, since the moment they start
> prodding the machine, it should come back to 'full on' mode.
>
> I use suspend a lot myself - my thinkpad will last 5~7 days while suspended,
> and I generally turn it off if it's going to be out for longer.
>
> Hibernate doesn't work for me - I ran the IBM utility to create a partition
> for it, but I just get a beep and a 'system is invalid' message if I try to
> suspend. Not sure why. It'd be nice if it worked, but I don't need it so
> it's Ok - I may try out swsusp later.
That's a lot of interesting information, especially about swsusp,
which I wasn't aware of.
If you suspend to RAM, energy use probably depends on the amount you
have. Do you think that extending your RAM shortens suspend time?
Thank you!
Rolf
Reply to: