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Did you update your drivers to the latest Crimson 15.11.1 Beta driver? It's available here. This was released a few days ago and addressed some issues, including an issue where the fan speed could get stuck at 20%.
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Thank you for your answer amdmatt, but i've already tried the Crimson 15.11.1 Beta driver with a clean install. I also tried leshcat driver but my system doesn't allow me to install their intel driver for the integreted graphic. It looks like nothing works