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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!


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