[Nouveau] [Bug 84932] Optimus with nouveau no longer works with xorg-server 1.16.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84932

--- Comment #5 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Looks like for prime + dri3 to work, you need render nodes. I thought they were
enabled by default in 3.16, but that is not the case. You can enable them by
adding "drm.rnodes=1" to the kernel cmdline. Or you can upgrade to 3.17.

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