I've been using Unity again for a bit with the standard ubuntu kernel,
and the unity app bar thing is drawing off-screen here as well (so it
wasn't just related to the main-line kernel).  Screenshot attached, and
running kernel:

 $ uname -a
Linux creswick 2.6.38-10-generic #46-Ubuntu SMP Tue Jun 28 15:07:17 UTC 2011 
x86_64 x86_64 x86_64 GNU/Linux

For posterity:

The attached screenshot was made after docking and running this alias:

 $ alias dock
alias dock='xset r rate 200 ; xrandr --output HDMI1 --mode 1920x1080 --rotate 
right --pos 1280x0 --output LVDS1 --pos 0x300 '

LVDS1 is the internal laptop display, running at 1280x800.

FWIW, if you count the pixels in the screenshot, the bottom ~20px or so
of the laptop display is black, and that portion of the screen won't
display windows.  It Will display the mouse cursor though.  I think this
"black bar at the bottom of LVDS1" behavior is consistent with the
mainline kernel, but I'm not certain about that detail.

** Attachment added: "screenshot after docking & adjusting screens manually via 
xrandr.  Note the vertical location of the unity app bar thing on the left."
   
https://bugs.launchpad.net/ubuntu/+source/unity/+bug/814721/+attachment/2248112/+files/unity-app-bar-wrong-place.png

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https://bugs.launchpad.net/bugs/814721

Title:
  [Intel i915] Docking with external monitor often corrupts screen

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