Daniel van Vugt  mentioned in Comment #48

"I suspect bug 933289 may have the same root cause."

I did report a bug about white line next to the Unity launcher after update 
3-25-2012 
Bug #964756 

And It is marked as duplicate of this bug. But I don't have the white 
flickering and corruption. 
I have however a white line from top to bottom, and that makes me thinking, I 
Have a ATI card and close driver installed but I also had problems with playing 
video with that driver (playing a video and I'm back to the login screen)

I did a work around found here 
https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/921384

[Workarounds]
* Switch to -ati
* Use oneiric until this is fixed.
* Disable Xv in your xorg.conf:

    Section "Extensions"
        Option "XVideo" "Disable"
    EndSection

Maybe... Maybe that is the reason i have a white line but NOT the  flickering 
and corruption
maybe something worth testing.

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https://bugs.launchpad.net/bugs/963093

Title:
  Unity 5.8: Flickering and corruption on Unity UI elements

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