Comment 42 for bug 883319

Can someone post some steps how to build in proper way patched xserver(? or xrandr?) on ubuntu LTS 12.04? Seems i have been bitten by it as well.
P.S.
BTW, it didn't bother me much before, when scaling worked properly, but is it intended behaviour, that if one sets real resolution After scale usage, it never covers whole screen? Tried to get by with temporary setting lower res, but all i get - still scaled output, but now with blacked out sides.