I have a no-name netbook-style laptop running up-to-date Fedora 29. https://www.canadacomputers.com/product_info.php?cPath=710_577_367&item_id=117289
When I close the lid, fedora almost always puts the notebook in sleep mode. Unfortunately, once in a while, it does not. And then my battery runs down.
The notebook has a light that indicates sleep by blinking slowly. Unfortunately, it is not visible while the lid is closed. Bad design.
I could put the notebook to sleep and then close the lid, but this is quite a bit more fiddly.
Why would Fedora fail to sleep once in a while?
Does anyone else experience this?
How would you go about diagnosing this problem?
(My fear is that this is a firmware bug. I'm pretty sure that there will never be firmware updates.)