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Here, this is what worked for me: I tried: sudo update-alternatives --config x86_64-linux-gnu_gl_conf sudo ldconfig -n sudo update-initramfs -u And rebooted, with no changes. So I tried: sudo apt-get purge libvdpau-va-gl1 bumblebee* nvidia* sudo apt-get install linux-headers-generic sudo apt-get install nvidia-331 nvidia-settings nvidia-prime Reboot. ...


New Intel driver is the problem. Nvidia doesn't support new drm environment. To remove the new driver run the following commands: sudo apt-get purge i915-3.15-3.13-dkms sudo apt-get install --reinstall xserver-xorg-video-intel libgl1-mesa-glx libgl1-mesa-dri xserver-xorg-core sudo dpkg-reconfigure xserver-xorg Then restart the system. optirun should work ...

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