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[Daniel Manrique <daniel.manrique@xxxxxxxxxxxxx>]

I can confirm this bug as I have observed it on every system I've tested
Oneiric Alpha 3 on, this includes about 30 laptops of different makes
and models, with chipsets from Intel, NVidia and AMD. Here are my
observations:

1- On Intel N10 systems, such as the Eee PC 1001 reported by Jeff, I get
the exact same corrupted pattern he describes. Note that there are
already  bugs covering compiz-related problems with external displays on
N10-based systems (bug 807161 and bug 790824) so in that particular case
we might actually be looking at two problems.

2- On other Intel systems I get a different pattern: the external screen
is entirely black, except for the top panel, and the built-in display
shows a "dead zone" on the top fourth of the screen, while the bottom
3/4ths are alive and well. I'm attaching a screenshot of the internal
display of an affected Intel machine.

3- On NVidia systems I get blocks of solid white or blue, with specks of
other colors scattered about. I'll try to get and attach a picture of
this.

4- Here's the interesting bit: it happens only when running Unity. If I
select Ubuntu 2d upon login, external screen functionality works fine.
On my Ubuntu 2d system I did ps wwuxa |grep compiz and compiz seems to
be running, so it would indeed appear to be Unity3D-related.

I confirmed this on an Oneiric A3 installation, fully dist-upgraded as
of today, August 11th.

Please let me know if I should attach logs, perform some more tests, or
maybe split this into different bugs, though it seems clear to me that
this happens everywhere with two screens.

-- 
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https://bugs.launchpad.net/bugs/824099

Title:
  [EeePC 1001 PXD] Plugging in external monitor to VGA port makes both
  displays corrupted with thick slanted lines

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