I rebuilt just about everything I could, and updated to 3.5.0.5-5 generic AMD64 kernel. uptime now 5 hours (using Google Chrome) without a lockup. More news as it comes to hand. PS. laptop running 5 ~ 10 degrees C hotter with disabled modes. PPS. Inkscape crashes back to login screen on launch/use. Anyone have a working Inkscape? Cheers, CC