[EdLUG] Linux hibernate

[Andrew Smith]

Hi Colin
I have 32Gb of swap, with *htop* reporting  none used in normal operation.
Suspend works OK. Given the minimal energy consumed overnight on suspend, I
may just continue using that until I can investigate further  how
*suspend-then-hibernate* is meant to operate by reading the sourcecode of
*systemctl. *
Andrew


On Wed, 14 Sept 2022 at 20:07, Colin Shorts <colin.shorts at gmail.com> wrote:

> I'm no expert on hibernate (I use suspend myself), but iirc you'll need at
> least as much free swap as system ram +used swap. 64GB doesn't sound
> unreasonable as a starting point assuming you've got enough space and
> considering how much Chrome can chew up.
>
> -Colin
>
> On Wed, 14 Sept 2022, 18:03 Andrew Smith, <asmith9983 at gmail.com> wrote:
>
>> Guys
>> For quite a while, I've been putting my system into suspend mode, which
>> was successful , apart from an odd occassion.  I now want to try saving
>> more energy
>> I've tried powering down, but would like it to restart in the same state
>> rather than with a new login, as I had with suspend.
>> I've tried "systemctl suspend-then-hibernate" from root CLI, but  I get
>> essentially  a fresh boot.
>>
>> Any suggestions ?
>> I'm running kernel 5.4.0-125-generic from Ubuntu, in 32Gb RAM, and
>> typically have a around hundred tabs open on Chrome.
>> Andrew
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