[ubuntu] Laptop heat

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http://ubuntuforums.org – Hi, so like 1 month ago I cleaned up my laptop and put on some new thermal paste. Had some serious heat problems. It seemed to fix it for sometime but now when I started to run a new game, my laptop seems to generate a looot of heat again, even tough it should be clean from the inside. The temperatures are like 80 C or higher when playing and it takes 10min+ for it to cool down when all processes are terminated. Is this really normal? It is a Acer tough, but still I dont think the temp should be that high.. (Hardware)