Happened to me reliably with my Acer Aspire One 110L, when watching
movies with mplayer (usually after 5 - 15 minutes). In my case switching
off framebuffer compression worked (See also
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/193419):
Section "Device"
Identifier "Configured Video Device"
Driver "intel"
Option "FramebufferCompression" "off"
EndSection
--
[i945] spontaneous black screen (major pipe-A underrun)
https://bugs.launchpad.net/bugs/311895
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