I have a laptop with Geforce 840M Gfx chip set, and Intel 4th Gen Core Processor Integrated Graphics Controller, and a clean install of Ubuntu 12.04, with all the recent updates.
glxinfo reported that glx functionality was working fine, but as far as I know the default nouveau drivers don't do 3D graphics acceleration, and s/w like Firestorm won't recognise the Nvidia chip-set, using the intel chips as default.
When I look for additional Drivers (System Settings -> Additional Drivers) no drivers are listed.
As I want to be able to use the capabilities provided by the Nvidia gfx chip-set, I manually install nvidia-319 from the repos (I believe that 319 supports the 840M chip set), and restarted.
I now have the following symptoms :
glxinfo reports that it can't find GLX extensions on the display.
firestorm wont start - since GLX does not work
I have noticed in /var/log/Xorg.0.log that the nvidia driver is loaded, and then some time later is unloaded : grep nvidia /var/log/Xorg.0.log
Between the nvidia module being loaded nouveas, vesa, modeset, fbdev and fbdevhw modules are all loaded (as reported in /var/log/Xorg.0.log)Code:[ 24.364] (==) Matched nvidia as autoconfigured driver 1 [ 24.424] (II) LoadModule: "nvidia" [ 24.424] (II) Loading /usr/lib/i386-linux-gnu/xorg/extra-modules/nvidia_drv.so [ 24.495] (II) Module nvidia: vendor="NVIDIA Corporation" [ 24.547] (II) UnloadModule: "nvidia" [ 24.547] (II) Unloading nvidia
Any attempt to use the nvidia driver (by using nvidia-xconfig to create /etc/X11/xorg.conf) results in a 600x400 res screen - presumably because the nvidia module is not actually loaded.
I want to get to the situation where the nvidia chipset is use in preference to the intel set - how do i do that ?
The BIOS does not allow the intel set to be disabled
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