OK, with ia32-libs uninstalled:
$ dpkg --list|grep ia32
rc ia32-libs 20090808ubuntu11
ia32 shared libraries for use on amd64 and ia64 systems
I get roughly the same behavior. I started with the laptop docked, and
when I undocked it actually switched to the internal screen OK. Then
when I redocked I got the black screen, and when undocking again I was
stuck with the black screen too (only showing a pointer that still moves
with the mouse).
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https://bugs.launchpad.net/bugs/745112
Title:
[arrandale] desktop is messed up (goes black) when laptop is docked
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