I’ve been trying out Elementary’s linux distribution Freya on my Dell E7440 for a while and whilst generally it’s been working pretty well, I’d have occasional issues with flickering, black screens and so on.
It seemed likely that it was a graphics issue and I’d tried various fixes from around the Internet without success – until yesterday! I found this suggested fix at reddit which seems to have solved it – now been running for 2 or 3 days without any graphics issues.
The suggested fix is below:
sudo apt-get install mesa-utils
sudo mkdir /etc/X11/xorg.conf.d/
echo -e 'Section "Device"\n Identifier "Intel Graphics"\n Driver "Intel"\n Option "AccelMethod" "sna"\n Option "TearFree" "true"\nEndSection' | sudo tee /etc/X11/xorg.conf.d/20-intel.conf