I could not get Unity to work. I do not know if it's because of a lack of 3D
acceleration or because I just didn't manage to configure it properly. I
followed the advice of
https://trisquel.info/en/wiki/how-install-unity-desktop-environment-and-create-session-entry-trisquel-70
on an almost fresh install of Trisquel 7 on the macbook. When I log in after
choosing the Ubuntu session, I get an error message about +space (which is my
hotkey for Synapse). After that i cannot move any of the windows, and there
is nothing resembling a "start menu" in any border of the screen. In fact I
could not even find anything giving me the option to log out. I had to right
click, open a terminal on Desktop, and kill Xorg to get back to the display
manager.
I have only ever installed Trisquel 7 (the default one, with GNOME desktop)
on this machine.
Youtube worked well using html5. I have not installed Gnash of any other
flash player.
I tried a few HD movies of various qualities and they play smoothly. One
thing I noticed is that the speakers are several orders of magnitude better
than on the ThinkPad x60s. However the fan is very loud because the machine
runs hot, so it's a compromise. Maybe this can be fixed a bit by using
PowerTOP...