The issue might be that the package xserver-xorg-video-sis is missing in the Ubuntu release on which Trisquel 8 is based (16.04) but appears in the Ubuntu release on which Trisquel 7 is based (14.04) as you can see here:

https://packages.ubuntu.com/search?keywords=xserver-xorg-video-sis

Have you tried Trisquel 7 to see if this package is the cause of your issues? If so, you might need to compile it manually in Trisquel 8.

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