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This will seems quite bizarre but that's a huge problem for me, I'm facing it for a long time since Ubuntu 12.04.

My Ubuntu/Linux Mint/Debian (Unity/Gnome) always starts flickering after using the computer for a while, I always thought this had something to do with the video board.

I have an Vostro 3550 (Radeon 6xxx/Intel Onboard).

First I realized that when I was navigating trough an website, when i selected with the mouse a combo, the combo closed it self automatically then the screen starts flickering.

The i realized when i was trying to make the login in the terminal (crtl + alt + f1) a strange character appears, like: ^@ repeatedly.

When i keep CRTL pressed the system never flickers!

I have absolutely no problem using Windows.

What can i do? There is no such thing as Keyboard driver on Dell Support.

I would love to use Ubuntu only, but this is very annoying.

Problem happens on Ubuntu 12.04, .10 and 13.04 Linux Mint 15 (Cinnamon) Debian Live with Gnome

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Which system out of Ubuntu/Linux Mint/Debian do you have? –  VedVals Sep 14 '13 at 9:50
    
Ubuntu 12.04, 12.10 and 13.04 - All of them; Linux Mint Olivia; Debian Live 7.10 (gnome) –  LeandroCR Sep 16 '13 at 20:58
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