Clean install number 1
After downloading the ISO files and burning them to a disc I installed windows 10 clean - but this time on a SSD (I was so fed up with reboots, that I needed some speed). To my surprise (or not really), the same problems persisted. Bad brightness control, random freezes and random machine exception errors. But that was not all. I also had an unstable wireless connection now. The connection is at random 'limited' and at random gave me a server not found error. No version for the atheros adapter worked to solve it, nor did any fix that I found on the web. I tried it through different networks and different routers. Same problem. The weird thing is that after the upgrade, the connection was stable. After the clean install, it was crappy.
A few random freezes later (over the course of a couple of days) rendered the system so unstable that I was considering to go back to windows 7. But Silly me didn't, instead I decided to give it 'one last try' and do another clean install (because you never know .. lol ..)