Computing stuff tied to the physical world

Again?

In Hardware on Jun 18, 2013 at 00:01

After yesterday’s puzzle, I thought that would be the end of it. But sensitised to this, I did check again this morning. And guess what… the problem came back!

Screen Shot 2013-06-17 at 08.32.41

This time, I was determined to find the culprit. Starting around my office with lots of powered devices, I narrowed it down to the power adapter of an Acer Inpire One netbook:

Screen Shot 2013-06-17 at 09.03.52

Seems conclusive, right? Extra evidence: I took that netbook apart a while ago to install more RAM. All went well, except that the battery charge circuit never seems to have recovered – it’s pretty tiny stuff in there, I must have damaged or disconnected something. Luckily, I was using this netbook only in the lab, i.e. plugged in, so no big deal for me.

Except… this netbook was not plugged in before yesterday. This is a different puzzle!

And digging a little deeper, the pattern is not even exactly tied to when it’s plugged in.

Oh well – this gives me an excuse to talk about knapsacks… stay tuned.