I just saw this on linuxtoday.com
How to Disable Suspend and Hibernation Modes In Linux
https://www.tecmint.com/disable-suspend-and-hibernation-in-linux/

Tell us if this works,
Don

On 1/3/21 9:07 AM, David Wright wrote:
>
>
> On Sun, 3 Jan 2021 at 10:20, David Wright <[email protected]
> <mailto:[email protected]>> wrote:
>
>
>     On Sun, 3 Jan 2021 at 09:57, Michele Mor <[email protected]
>     <mailto:[email protected]>> wrote:
>
>         Hi,
>         Maybe it's something related to power settings and not lock
>         screen?
>
>         Michele
>
>
>
>
>     Thanks Michelle
>
>     All settings under Power Manager > Display are set as 'Never' -
>
>     Blank After - Never
>
>     Put to sleep after - Never
>
>     Switch off after - Never
>
>     Dave
>
>
>
> *Update* - on an earlier attempt to keep the screen on, I'd set the
> screensaver/system idle time to 180 minutes.  Even though the
> screensaver was subsequently disabled, it seems this 3 hour time was
> still having some affect, as the screen was indeed going black after
> three hours.  I've now set that timer to 999 minutes (over 16 hours)
> which should suffice for most days.  Screensaver then disabled again. 
> I've never had this problem before.  Just set everything related to
> display to off or never and it's been fine.  If anyone has any more
> thoughts, I'll be happy to hear them as I feel the 999 minutes is an
> inelegant fudge/workaround.
>
> Kind regards
> Dave
>
>  
>

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