Following instructions provided in Chapter 17. Using the NVIDIA Driver with Optimus Laptops , Chapter 32. Offloading Graphics Display with RandR 1.4 and Chapter 33. Direct Rendering Manager Kernel Modesetting (DRM KMS) I am unable to successfully start a X-Server with NVIDIA Optimus enabled - all I …

Looks like you’re using gentoo, xorg-server has to be built with USE=“glamor” for Prime to work. Furthermore, downgrade kernel to 4.14.x, nvidia-drivers doesn’t yet fully work with kernel 4.15. Then you will want to set nvidia-drm.modeset=1 as kernel parameter to get rid of tearing.

some more quirks: the intel device section has to be defined before the nvidia device section (don’t know if that bug in xorg has been fixed) and also has to have the busid and glamor disabled like this: Section "Device" Identifier "intel" Driver "modesetting" Option …

@generix : ty for the glamor thing. my guess is, that did the trick. And there I thought I read in the NVIDIA manual the extact opposite. In Chapter 32. Offloading Graphics Display with RandR 1.4 it says ‘versions of the “modesetting” driver try to load a sub-module called “glamor”, which conflicts …

Thing is, there’s a difference between glamor use being compiled in and glamor actually being used. The modesetting driver needs part of the glamor code to work properly. Glamor use is disabled with Option "AccelMethod" "none"

Thx for the explanation! No more problems ATM, seems to work fine.

Lenovo t470p - GeForce 940MX - Linux 4.15.2 - Xorg 1.19.5 - NV Drv 390.25 - Nvidia Optimus not Working - #7 by nadeemm - Linux

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