Comment 1 for bug 1705551

Hi,
you said "all sorts of keyboard combinations" but maybe it is worth a try. I had a similar case where it actually enabled the display, but at brightness 0 - you might not accidentally have the same case? I could get it on by using the FN keys to increase brightness in those cases.

Another question would be if you never close the lid, but suspend via SW.
And next day you wakeup via the alarm (while the lid was still open when sleeping) - is it then waking up normally with display enabled?

Finally - I beg your pardon as I'm not an expert on this - but the following could enable it.
You might need tweaks to actually "reach" your xorg, but I'm sure you can do that. Once you did call:
 $ xset dpms force off
That should disable the power saving blank that your screen is in.