Schorsch, 4 months ago I had a similar issue on a new out of the box HP Prodesk. Independently of the distro I was running it wouldn’t want to wake up from standby. Turned out to be an (firmware?) issue with the SSD. After replacing it everything worked fine.
I had a similar issue on a new out of the box HP Prodesk. Independently of the distro I was running it wouldn’t want to wake up from standby. Turned out to be an (firmware?) issue with the SSD. After replacing it everything worked fine.