Adding "Framebuffercompression false" like below did the trick.
Section "Device"
Identifier "Intel Corporation Mobile 945GM/GMS/940GML Express
Integrated Graphics Controller"
Driver "intel"
BusID "PCI:0:2:0"
Option "FramebufferCompression" "false"
EndSection
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[i945] screen goes black after a while with intel integrated graphics 945
https://bugs.launchpad.net/bugs/305227
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