[ubuntu] NVidia 8400M - full frame?

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http://ubuntuforums.org – I have searched the web prior to posting, and I can find several posts (in various *nix versions) about the NVidia 8400M having trouble with full frame flash, which means (notably) Youtube, back in 2010-2012. In my searching I didn't find a definitive cure (just a load of "try this" style posts). Symptoms/report: When watching youtube, if I go "fullscreen" it's very flickery to start with, then locks solid. Power sequence is only way out. Video card is essentially "good" (and quite fast); e.g. Stellarium runs at 59 f/s, fullscreen, Machine; Code: lshw -c (Hardware)