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I have this problem only when I use my laptop with an external monitor (this is the way I used to use it). So every time I start my laptop with the external monitor connected, it is unusable. When starting with the built in monitor, it works perfectly. I tried to follow this tutorial but it worked until the first restart.

My laptop is an old DELL inspiron 1521 with an ATI GPU.

Does anyone know how to solve this problem?

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