I have a Samsung QX411-W02UB laptop and I have tried installing Ubuntu 12.04-64bit from the ISO file and from WUBI and I am getting the same issue. Right after I install it the OS works fine, then after a reboot the issue occurs. Once I reboot and login the OS runs fine for a couple minutes, then the brightness notification bubble pops up (automatically) and the screen flickers and the OS freezes.
Anyone else having the issue, or know what it is? I was going to try a install of an earlier version of Ubuntu, either 11.04 or 11.10 a little later today to see what happens.
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