On Tuesday 22 September 2020 10:13:45 am Uwe Brauer via tde-users wrote:
> Hi
>
> I in Thinkpad X1 8th generation I installed finally Ubuntu 20.04 and
> relevant trinity package from the pre-stable release.
>
> Now when the machine is running on batteries and is not used for couple
> of minutes the screen brightness is dimmed down, but the machine
> freezes, and has to be rebooted.
>
> Is that an Ubuntu bug? Or trinity's fault.

Probably Ubuntu.  It sounds like (based on the timing) a power saving function 
is kicking in and trying to suspend or hibernate the machine.
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