In my system the TV output is already disabled (without the above lines in 
xorg.conf). Running xresprobe intel does not give the colored blocks.
Screen 0: minimum 320 x 200, current 1280 x 800, maximum 1280 x 1280
VGA disconnected (normal left inverted right)
LVDS connected 1280x800+0+0 (normal left inverted right) 331mm x 207mm
   1280x800       59.9*+   60.0  
   1280x768       60.0  
   1024x768       60.0  
   800x600        60.3  
   640x480        59.9  
TV disconnected (normal left inverted right)

I did find something in the logfiles: the installation uses framebuffer
and loads modules fbcon and vga16fb (+ some depending modules). My
installed system does not use these modules.

When I do the installation without any additional boot option, I get the 
colored blocks
when I do the installation with boot option vga=771 or fb=false, I don't get 
the colored blocks.
Could this mean the problem is caused by using framebuffer with the intel 
driver?

I also found a way to reproduce the problem manually: I don't answer the 
question about language support in the installation but switch to tty2. When I 
just install xresprobe and xserver-xorg-video-intel manually, the colored 
blocks show (no boot-option).
Could I retrieve more information by doing this manual install with some 
special options?

-- 
Alternate install of Tribe-4 corrupts video display when installing packages
https://bugs.launchpad.net/bugs/127008
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