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[Daniel Manrique <daniel.manrique@xxxxxxxxxxxxx>]

Here's some more diagnostics:

I tried this with Ubuntu Maverick. The primary display remains
functional and shows everything correctly with no sluggishness, but the
secondary display, upon plugging in, appears to have a width of only one
pixel; that is, if I move my cursor to the secondary display, I do see
about half of the cursor on the very left edge of the secondary display,
and it doesn't go any farther than that. I obviously can't drag any
windows to that display (they seem to hit the "edge" and don't go
through.

the secondary display is an Acer VGA monitor capable of 1280x1024, and X
tries to use this maximum resolution when plugging it in.

I then went and changed the resolution of the secondary display to
1024x768. Lo and behold, now it works! a 1024x768 area of the monitor is
visible and I can drag windows and use it just fine, with no
sluggishness, *but* the part of the monitor outside this area is black
(i.e. it's not "scaling" things to the monitor's full size).

I went back to one of the Natty systems and tried changing the
resolution. The primary display has native resolution of 1024x600. If
the secondary display is at 1280x1024 or 1024x768, I get sluggishness
and display corruption as described above. BUT if I resize the secondary
to 800x600, then the background displays OK, no sluggishness and
everything works very well. Under Natty, the display correctly scales to
fill up the entire screen.

I tried another panel, a Dell capable of 1680x1200. Same results, for
any resolution of 1024x768 or higher, the display is corrupted and
pretty much unusable, and system is sluggish. For 800x600 and lower,
everything works fine.

Hopefully this information will be helpful. Behavior in Maverick is a
bit better but still not OK, so I won't mark this bug as a regression
since it looks like the problem has been present for a while on this
graphics chipset.

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https://bugs.launchpad.net/bugs/807161

Title:
  [Intel Corporation N10 Family Integrated Graphics Controller] Display
  sluggish, black background and repeated windows drawn when external
  monitor is connected

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