Hibernate -OK- Standy 'fails to re-boot'

G.. wrote:
> Hibernate -OK- Standy 'fails to re-boot'
>
> If the pc is set to standby , by using the 'power off >
> standby' buton, it shuts down , but on re-start , the system
> starts to boot, but no video and seems to hang at this point
>
> If its is set to hibernate , system shuts down , and on re-
> start , boots normally back to the last settings ..
>
> By the lack of video , is this a motherboard problem ? is there
> any bios setting's that affect 'standby' ?
>
> Tnx -G..
>
> Gigabyte EX58-UDP , Bios F41p 28/1/2011

What is the model number of the motherboard ? I don't see a match here,
for your stated value. I suppose it could be GA-EX58-UD4P.

http://www.gigabyte.com/products/list.aspx?s=42&jid=0&p=2&v=1

*******

My policy on this is pretty simple.

If a computer recovers properly from S3 Standby Suspend To RAM, then use it.

If the computer crashes, when coming out of S3, then don't use it

I have one motherboard, which crashes like that in about 25% of recovery
from S3 cases. So I just use Hibernate instead.

*******

When in S3 Standby Suspend To RAM, the DIMMs are powered from the +5VSB rail
of the power supply. If power is interrupted on there, even for a moment,
the contents of the RAM are lost.

The memory controller or the memories themselves, need to execute "refresh"
to maintain the dynamic contents of the RAM. This takes a small amount of
power, at least compared to regular read and write cycles to DRAM.

When the computer switches to S3, there can be a voltage level change in
the power path to the RAM. This should normally be a gentle transition,
that doesn't damage RAM contents. If the motherboard has a design defect,
it could lead to loss of RAM contents. Even a BIOS bug, could be damaging
your RAM contents (either during the shutdown process, or at startup and
commissioning the hardware).

So the problem could be power related, motherboard design related, bad RAM,
BIOS bug, the list is endless. You could expend a lot of effort, trying to fix
it.

If you have some Apple product charging from a USB port, maybe that's enough to
overload the +5VSB rail ?

At least check the forums that discuss your motherboard, to see if this
is a known problem, fixed with a particular BIOS release. If you don't see
a lot of mention of that kind of problem, then suspect some other hardware
inside the computer.

Paul
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