Public bug reported:

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04 LTS"

xserver-xorg-video-nouveau:
  Geïnstalleerd: 1:0.0.16+git20111201+b5534a1-1build2
  Kandidaat:     1:0.0.16+git20111201+b5534a1-1build2
  Versietabel:
 *** 1:0.0.16+git20111201+b5534a1-1build2 0
        500 http://nl.archive.ubuntu.com/ubuntu/ precise/main i386 Packages
        100 /var/lib/dpkg/status

VGA compatible controller: NVIDIA Corporation NV34GLM [GeForce FX Go
5300] (rev a1)

On desktop, items that are moved down to below 1/3 of the screen are magically 
disappearing behind an "invisible horizon". 
I am a noob when it comes down to videodrivers but is seems like although the 
desktop and backdrop are rendered nicely full screen the items on it seem to be 
rendered to a smaller field and get clipped when passing the "border". 
Resizing the desktop to another size and back again seem to solve this issue.

I'll paste my temporary workaround here for people with the same problem
and the same hardware while awaiting a fix.

workaround suitable for: NV34 (64MB) with laptopscreen 1024x768@60
workaround for nouveau bug that cuts off everything on screen 
beneath a certain invisible horizon
resizing (and resizing back again) seems to be the only "fix" without disabling 
render acceleration
workaraound tested (and works) 

put the code below in a file, make it executable and put it in "startup
applications" in your desktop:

#!/bin/bash
xrandr --output LVDS-1 --mode 800x600 --panning 800x600
xrandr --output LVDS-1 --mode 1024x768 --panning 1024x768

** Affects: xserver-xorg-video-nouveau (Ubuntu)
     Importance: Undecided
         Status: New

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which is subscribed to xserver-xorg-video-nouveau in Ubuntu.
https://bugs.launchpad.net/bugs/996168

Title:
  [precise](workaround incl) nouveau doesn't render items on lower third
  of desktop

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