https://bugs.freedesktop.org/show_bug.cgi?id=104784 --- Comment #1 from Pierre Moreau --- Hello, > AC: core 0 MHz memory 0 MHz means your GPU is actually suspended: since you have an Optimus configuration, the NVIDIA GPU will suspend automatically if it hasn’t received any work to do in a short while. Try for example to run `DRI_PRIME=1 glxgears`, keep it running and reissue the cat command: you should not see actual clocks for on the AC line. Have a look at https://nouveau.freedesktop.org/wiki/Optimus/ to learn how to configure Prime. As for the system hang when trying to reclock a suspended GPU, patches have been sent to the Nouveau mailing list, but haven’t been merged yet. You can find them here: https://github.com/karolherbst/nouveau/commits/clk_cleanup_for_real > And when i launch a game (Tyranny), it does not work. What is not working? If you didn’t specify anything, the game should run on the “primary” GPU by default, which quite often tends to be the Intel GPU. -- You are receiving this mail because: You are the assignee for the bug.