I've been using Ubuntu 12.04 on my Macbook Air 3,1 (11", late 2010 model) and it's been working well, after applying the post-installation patches found on the wiki.
Yesterday (July 24, 2012), after doing an apt-get dist-upgrade, I noticed a glitch with the LCD screen: there is a vertical row of colored pixels that moves from top to bottom, with a marquee-like effect.
I do not think this is a hardware problem, since it does not appear when I boot the computer into MacOS.
The glitch is about 2 mm from the right edge of the screen, so it is not too noticeable (there's usually a scroll bar there), but I still would like to make it disappear.
I did a brief Google search for this problem but haven't found anything yet. Can you suggest how I can investigate and hopefully fix this?