A quick web search suggests that the laptop in question has a ATI Mobility 
Radeon 4x AGP graphics chipset in it.
I can confirm that a similar rendering error occurs on a Dell Precision 
WorkStation 340 which has a dualhead ATi card reported by lspci as: Radeon 
RV100 QY [Radeon 7000/VE].

I am not running the ATi binary drivers, so I suspect this is a bug in
the xorg radeon driver.

** Changed in: Ubuntu
Sourcepackagename: None => xserver-xorg-driver-ati
       Status: Unconfirmed => Confirmed

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On all screen buttons, I have lines/ dots in the dialog boxes
https://launchpad.net/bugs/50819

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