Came across an odd one this morning.
I was using my Samsung N150 Netbook (which is a great little box by the way) and went from AC power to battery as I moved around this house. Handy, you might think.
The display stayed bright and could not be adjusted using the FN key as normal, my battery life was in peril!
A few checks and I noted that a Windows Update had occurred which had applied an updated version of the Intel graphics driver since I had last used the N150 and my mind immediately assumed this was the culprit.
I went up to Samsung’s rather “HP-like” driver download site and grabbed the version they had (version 220.127.116.118) and applied it (Run As Administrator required) and after a re-boot all was working again.
Top Tip Moral:
ALWAYS look at what Windows Update has been doing to your ‘pooter, it is a trixie little Hobbit on occasion and frequently breaks stuff in my experience!