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[Yaneric Roussel <yroussel@xxxxxxxxxxx>]

With the last update I ended up having no nvidia modules loaded. It was
exactly because of this bug.

Even something like:
#blacklist nvidia
in a config file "blacklist.conf~" (emacs backup file)

makes nvidia module not loaded...

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https://bugs.launchpad.net/bugs/1376966

Title:
  gpu-manager treats all files in /etc/modprobe.d as config files

Status in “ubuntu-drivers-common” package in Ubuntu:
  New

Bug description:
  My media center computer have a single nvidia GPU connected to a TV,
  and have for many years been happily using the nvidia driver.
  Unfortunately the recent upgrade to version 1:0.2.91.7 broke X.
  Starting lightdm would fail, delete my xorg.conf and redirect libgl
  symlinks to mesa.

  After some debugging I fond that this was done by gpu-manager, because
  it incorrectly believes that my nvidia module is blacklisted. gpu-
  manager.log contained "Is nvidia blacklisted? yes".

  More debugging determined that this was happening because I have a several years old file named:
    /etc/modprobe.d/blacklist.dpkg-old
  which among other things contain the line "blacklist nvidia".

  However that is _not_ a modprobe config file. modprobe only uses files
  with a .conf extension. (See the man page modprobe.d(5)).
  Unfortunately gpu-manager does not have this restriction and looks in
  all files in /etc/modprobe.d by running:

    grep -G "blacklist.*nvidia[[:space:]]*$" /etc/modprobe.d/*

  
  I could work-around the bug by removing the .dpkg-old file. However this will likely break other machines as well. I found two bugs 1373968 and 1374871 about X not working after installing the latest update. However they does not contain enough information to determine if they are duplicates of this bug or not.

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