Comment 14 for bug 776565

After the latest update (but not necessarily strictly/immediately; ie, I haven't tried in some weeks), including backports:

I just booted with my external plugged in. gdm (or whatever it is) came up perfectly. I logged in under Unity, and the external came up in the right place, working more or less as it should: no black / invisible areas, no crash, etc.

That is, the bug appears fixed. Other subscribers, can you confirm?

(Now, on to deal with all the other more general failures of Unity to handle extended desktops properly...)