http://bugs.winehq.org/show_bug.cgi?id=22041
--- Comment #17 from Austin English austinenglish@gmail.com 2012-01-24 13:21:05 CST --- (In reply to comment #16)
more simple workaround: run any little game (e.g. quake) and set it's screen resolution to screen's native one
Or just use xrandr, e.g.: $ xrandr -s 1680x1050