Already for several weeks, I am having a huge and very annoying issue: Very frequently, but in irregular intervals of time, it happens again and again that my screen suddenly turns totaly white.
I am working on a IdeaPad Z370 by Lenovo and I am using Kubuntu 12.10 (x86_64), Kernel 3.5.0-27-generic. The only things I am doing on my laptop is surfing with Opera, writing my papers with LibreOffice and listening to music and watching movies with VLC.
I tried to search on the web about this issue, but didn't find anything suitable for me.
I am quiet sure that this issue isn't a system crash or just a freezing of the system or something else like this, because when I turned in a HDMIm I could see a proper screen on the second monitor and could go on working.
While searching the web, I found http://diyistheway.blogspot.de/2012/...-z370.html?m=1 and followed all the steps (except 3 & 5) described there.
This Z370 has two grafic cards, but when I used to work with Optimus turned on, my laptop became very, very hot.
Then I found somewhere to turn of the NVIDIA grafic card in the BIOS and enable just the VGA.
This was what I did.
Some month ago, when this issue appeared the first time, I read somewhere that I should Bumblebee and configure it. - But I don't know anymore, where I found it and which steps exactly I realized concerning this.
In the syslog I couldn't find any entries about the sudden white screen.
Before I am going to give away my laptop to repair it or buy a new one, I wanted to ask you if this issue is known. What is the reason of this problem? What can I do against it?!
I am really about to be totally desperate, because working properly is impossible that way.
Thank you in advance for your help & support!