After upgrading from Xubuntu 14.04 to 14.10 some black signs appear on the windows.

$ dmidecode
  System Information
  Manufacturer: TOSHIBA
  Product Name: Satellite Pro L350

$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)

$ cat /var/log/Xorg.1.log | grep AIGLX
(II) AIGLX: Suspending AIGLX
  • Can you post a screenshot of what the problem looks like? – Aibara Nov 14 '14 at 1:31

There was some problem in the graphic acceleration of XFCE with this computer.

The solution was to disable compositing that gives you many effects like transparency and shadows

Go to: Applications -> Settings -> XFCE Settings Manager
Remove the check from Enable compositing effects

More information here:

Are there 3D effects on Xubuntu? (hardware-accelerated graphics)

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