New answers tagged graphics
I'm pretty sure that Nvidia drivers bypass X system almost entirely, in a similar way as Mesa drivers use DRI. You will be able to measure the X11 overhead (if any) once Nvidia starts to support Wayland in their drivers.
After some digging around on forums and in the kernel I discovered that Fiji isn't supported yet. Partial support is expected in 4.3 and full support in 4.4.
sudo add-apt-repository ppa:graphics-drivers/ppa && sudo apt update && sudo apt-get install nvidia-352 nvidia-settings
My problem ended up being not having a duo-link DVI support from my graphics card. It scaled to 1920x1080 just fine, but doesn't support 2560x1440 @ 60Hz. There are apparently some workarounds to get to 2560x1440, but I'm happy with 1080p since it's not my main machine.
On Ubuntu 15.10, after I installed nvidia-352 and the GPU seems to work: nvidia-settings shows something like: Note how it shows: GPU 0 - (NVS 5400M) where NVS 5400M is my GPU model. This did not show up before I had installed the driver. Also f I fire glxgears, the GPU usage goes to > 90%, further sign that it is working. But the ultimate test is ...
It looks like the nouveau module is not actually currently loaded. This is likely because the nvidia installer blacklisted it to avoid conflicts, then neglected to undo this when it was uninstalled. Look in /etc/modprobe.d; there should be one or more files. One of them may well contain a line with blacklist nouveau or similar. Edit that file to remove ...
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