Comment 44 for bug 1310023

I tried the following commands, doesn't work after reboot still get:

sudo prime-select query
unknown

sudo cat /proc/acpi/bbswitch
cat: /proc/acpi/bbswitch: No such file or directory

I Have to manually load bbswitch as it has stopped starting at boot using:

sudo modprobe bbswitch to get sudo cat /proc/acpi/bbswitch 0000:01:00.0 ON

sudo update-alternatives --config x86_64-linux-gnu_gl_conf
There are 3 choices for the alternative x86_64-linux-gnu_gl_conf (providing /etc/ld.so.conf.d/x86_64-linux-gnu_GL.conf).

  Selection Path Priority Status
------------------------------------------------------------
  0 /usr/lib/nvidia-331/ld.so.conf 8604 auto mode
  1 /usr/lib/nvidia-331-prime/ld.so.conf 8603 manual mode
  2 /usr/lib/nvidia-331/ld.so.conf 8604 manual mode
* 3 /usr/lib/x86_64-linux-gnu/mesa/ld.so.conf 500 manual mode

Press enter to keep the current choice[*], or type selection number: (Tried with all the above selections)
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

sudo ldconfig -n
sudo update-initramfs -u
sudo reboot