Hi,
On the latest update to kernel 4.5 the build is screen starts flickering or freezes when connecting an external display.
My 21-intel.conf files looks like this:
Section “Device”
Identifier “Intel Graphics”
Driver “intel”
Option “monitor-eDP1” “eDP1”
Option “DRI” “3”
Option “TearFree” “true”
EndSection
Section “Monitor”
Identifier “eDP1”
Modeline “1920x1080” 173.00 1920 2048 2248 2576 1080 1083 1088 1120
EndSection
My card is Intel® HD Graphics 530 (Skylake GT2)