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After a lot of digging into the topic I found that one guy here https://github.com/Bumblebee-Project/Bu … issues/782 has "solved" the problem running the following command:
$ sudo Xorg :8 -config /etc/bumblebee/xorg.conf.nvidia -configdir /etc/bumblebee/xorg.conf.d -sharevts -nolisten tcp -verbose 3 -noreset -isolateDevice PCI:01:00:0 -modulepath /usr/lib/nvidia/xorg/,/usr/lib/xorg/modulesOnly after executing that command optirun works for me as well.
Even though I've read the man of Xorg I don't quite get what the command exactly does. Does it run an X session using only the nvidia driver?
Eventually if it helps I can post the output of the command.
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