[EdLUG] Linux hibernate

[Colin Shorts]

Hi Andrew, I'd be inclined to add a smidgen more swap to be on the safe
side.

I take it `sudo pm-hibernate` doesn't work (correctly) either? Are the
kernel parameters getting set at boot (I think dmesg should say which
device will be used)? Is your swap partition on lvm, are you mounting it
using the uuid?

I'm in the middle of redecorating my home office or I'd give it a bash
myself 😃

Cheers,
Colin

On Fri, 16 Sept 2022, 01:16 Andrew Smith, <asmith9983 at gmail.com> wrote:

> 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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