I think it is always a good idea to check the hardware manufacturer's site
for specifications. Here is Intel's page concerning the DH55TC motherboard:
http://ark.intel.com/Product.aspx?id=42408
This board has some new Intel's technology called "Flexible Display
Interface" (FDI) which allows the use of a CPU with integrated graphics. That
means you won't have any graphics without such a CPU or a discrete graphics
card. You can check the following page for CPUs compatible with the DH55TC
motherboard and see which have integrated graphics:
http://processormatch.intel.com/CompDB/SearchResult.aspx?BoardName=DH55TC
I have no idea whatever Trisquel would run with such a CPU or how the video
acceleration would compare with any of the GPUs integrated into motherboards
- I also would like to know.