I didn't mean to denigrate the Zenbook - my partner loved it.

As a friend of mine (a hardware engineer as it happens) often said - "Hardware eventually breaks, software eventually works" ...

Hey syg00 - no no - no worries - I wasn't referring to your post in any critical way at all - sorry if that's the impression I gave. I just wanted to make sure that our OP (bertradio) didn't automatically assume that he had a hardware problem.

... Love the quote, by the way ... must remember that.

Cheers - Happy Weekend :-)

Rick,

Thanks for all the help. I'll think hard about how to move on (or not) from here.

Bert

And the strangeness continues...

Since neither powertop nor laptop-mode-tools worked, I uninstalled both. Also, it appears an intermittent ethernet issue was coming from powertop.

After the normal uninstall, I went to the Synaptics Package Manager and did a complete uninstall removing everything that showed up. Then I did apt-get autoremove.

After all that, the problem has gone away and the laptop properly suspends and resumes. I have no idea what the issue might have been.

Thanks again for the help.

Cheers

Bert

That is indeed strange. Obviously something had been installed that was interfering with power management in some way. Glad it's working again - it's just too bad you don't know exactly what the cause was - makes it tougher to know what to avoid in future ...

The only useful suggestion I can give you with respect to that is to try to be as granular as possible going forward and avoid installing too many new packages simultaneously. Test suspend-resume on battery after every change and maybe you'll eventually be able to identify the culprit.

Cheers, bert - have a great weekend !

Rick,

I think it may have been something installed, but I still don't understand why the problem remained when I booted from a USB.

I do keep a log of everything I do to the system so I can try and trace back for any problems. And yes, I am careful about installing new things. I have a VirtualBox on my Win10 desktop running Mint and I test things there.

Thanks again for the help.

Bert

Excellent practice. And you're very welcome - I'm happy if I was able to help.

Cheers.