Someone already covered the fix for it here. It is a bug, but this is a temporary workaround:
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sudo lspci -v|grep Ethernet
I noticed artefacts appearing after watching TV for a while, getting out of mythtv, running the screensaver or watching a video, then they appear. Reboot of the MD fixes that. Nvidia drivers 260 are installed.
ssh dcerouter - (or 192.168.80.1)
ssh moonXXX - substitute the X's for your MD number of course
type / and then enter vesa then hit enter again
highlight first letter of vesa (if not already done)
cw intel - yes just type the letters cw then i n t e l - then hit esc key - vi crash course J.I.C. ;)
save file by doing
press shift and make a :
then type wq! and hit enter