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Many of the google hits are related to ATI Radeon video cards. I know you have ATI video drivers (from your logs) but I can’t tell if your graphics are intergrated or you have a card installed.
Do you know if you have a video card and, if there is, how old it is?
EDIT: Appearently ATI GForce cards are also affected to some degree.
EDIT #2: Heres a link to the ATI support site reagrding display corruption, including lines, checkerboard patterns, flashing dots, giant triangles, etc
http://support.ati.com/ics/support/default.asp?deptID=894&task=knowledge&questionID=28026
I’m wondering how a giant triangle actually fits on the screen.