Can't switch anymore from Intel to NVIDIA GPU

As you get the following error:

Error: alternatives are not set up properly

You may try to set the alternatives yourself.

When I switch to Intel I see:

update-alternatives: using /usr/lib/nvidia-331-prime/ld.so.conf to provide /etc/ld.so.conf.d/x86_64-linux-gnu_GL.conf (x86_64-linux-gnu_gl_conf) in manual mode
update-alternatives: using /usr/lib/nvidia-331-prime/alt_ld.so.conf to provide /etc/ld.so.conf.d/i386-linux-gnu_GL.conf (i386-linux-gnu_gl_conf) in manual mode

When I switch to NVIDIA I see:

update-alternatives: using /usr/lib/nvidia-331/ld.so.conf to provide /etc/ld.so.conf.d/x86_64-linux-gnu_GL.conf (x86_64-linux-gnu_gl_conf) in manual mode
update-alternatives: using /usr/lib/nvidia-331/alt_ld.so.conf to provide /etc/ld.so.conf.d/i386-linux-gnu_GL.conf (i386-linux-gnu_gl_conf) in manual mode

So you could try this to switch to Intel:

sudo update-alternatives --set x86_64-linux-gnu_gl_conf /usr/lib/nvidia-331-prime/ld.so.conf
sudo update-alternatives --set i386-linux-gnu_gl_conf /usr/lib/nvidia-331-prime/alt_ld.so.conf

Obviously you should replace 331 by your own version.

Now you could try a few things to trigger the switch:

• Log out and log in again

  to restart the X server as you normally would do

• Reboot your whole PC

  for the same purpose of the above

• Execute sudo prime-select nvidia

  as your alternatives are now set for Intel, I hope this will also fix any other settings so that everything is as it should be again (obviously you should still restart the X server)

I hope that I've interpreted the error right.

Also, you could use prime-select query to check which card is currently selected, and fix the alternatives for that card (for example NVIDIA) as you may somehow have set alternatives for the other card (for example Intel), but the tool is still thinking that you're using the other card (for example NVIDIA), thus giving an error saying that the alternatives are not set up properly.

I think I've found a workaround at least.

It's all about update-alternatives.
I've noticed that both

sudo update-alternatives --config i386-linux-gnu_gl_conf

and

sudo update-alternatives --config x86_64-linux-gnu_gl_conf

returns list containing /usr/lib/i386-linux-gnu/mesa/ld.so.conf or similar.

Somehow after every reboot /usr/lib/i386-linux-gnu/mesa/ld.so.conf was set as choosen even if I've changed it before manually.

I tried changing the order on that list, but finally the solution was to remove it by

sudo update-alternatives --remove x86_64-linux-gnu_gl_conf /usr/lib/x86_64-linux-gnu/mesa/ld.so.conf

and

sudo update-alternatives --remove i386-linux-gnu_gl_conf /usr/lib/i386-linux-gnu/mesa/ld.so.conf

That should be enough.
If not, set both 'i386' and 'x86_64' to the same option by

sudo update-alternatives --config x86_64-linux-gnu_gl_conf

and

sudo update-alternatives --config x86_64-linux-gnu_gl_conf

Reboot afterwards.

You can always restore it to original state by

sudo update-alternatives --install /etc/ld.so.conf.d/i386-linux-gnu_GL.conf i386-linux-gnu_gl_conf /usr/lib/i386-linux-gnu/mesa/ld.so.conf 500  

and

sudo update-alternatives --install /etc/ld.so.conf.d/x86_64-linux-gnu_GL.conf x86_64-linux-gnu_gl_conf /usr/lib/x86_64-linux-gnu/mesa/ld.so.conf 500

Hope that it will also work for You.

what worked for me , I am still trying to find his post. I had so many i was viewing:

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. Still, no changes, and the same blank error message in nvidia-settings when I try to switch to me nvidia card.

I tried switching manually, using sudo prime-switch nvidia, and configuration info was updated. I tried again, and nvidia-settings asked me to log out and log back in and...voilà! I've got it working!

In my case, it appeared that before being able to switch using nvidia-settings UI, I had to manually switch first as superuser, so as to generate the proper configuration!

Good thing I tried that, or I'd still be tinkering about, installing other drivers! Hope this proves useful to someone else!

follow pre answers, this is the way how I get it right on my linux mint 17.2.

first I do:

sudo update-alternatives --config x86_64-linux-gnu_gl_conf

select the one with 'nvidia-prime':

sudo prime-select nvidia

then restart:

sudo init 6

I've had a problem that looked the same, and the answer was that I still had bumblebee-nvidia installed.

Notice that you're purging "everything NVIDIA" with sudo apt-get purge nvidia*, and the package above doesn't match that wildcard.

So, run command:

apt-get purge bumblebee-nvidia nvidia*

Then reboot, then install the relevant nvidia-xxx, nvidia-settings and nvidia-prime packages (I'm currently using the version 340.24 from xorg-edgers).

Now during this installation you should see the relevant update-alternatives messages about the *gnu_gl_conf files.

I found the solution.

I'm not sure what exactly was the problem, but this issue seems to have disappeared on a fresh install of 16.04. Perhaps they updated the dependencies properly in it? I'm not sure.

But I can personally confirm that this is no longer an issue in 16.04. I used to have the EXACT same issue in 14.04. But now with 16.04 it is no longer an issue.