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[Alex Tu <1717151@xxxxxxxxxxxxxxxxxx>]

** Changed in: oem-priority
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1717151

Title:
  driver installation might not build initramfs then cause dark screen
  after switching to nvidia

Status in OEM Priority Project:
  Fix Released
Status in nvidia-graphics-drivers-384 package in Ubuntu:
  Fix Released
Status in nvidia-graphics-drivers-384 source package in Xenial:
  In Progress
Status in nvidia-graphics-drivers-384 source package in Zesty:
  In Progress
Status in nvidia-graphics-drivers-384 source package in Artful:
  In Progress

Bug description:
  SRU Request:

  [Impact]
  When power saving mode is enabled, the initramfs will not be update, thus leading to a potential API mismatch between kernelspace and userspace.

  [Test Case]

  1) Make sure the nvidia packages are installed, and enable power saving mode:
  sudo prime-select intel

  2) Enable the -proposed repository, and install the new "nvidia-384"

  3) Check that the initramfs is updated.

  4) Restart your computer and see if the driver works correctly (you
  should be able to access the desktop session)

  [Regression Potential]
  Low, as updating the initramfs is always the (intended) default behaviour.
  _______________________________

  Note: without fix be landed , nvidia driver online update could be
  failed.

  nvidia-375.postinst not always build initramfs by default:
  "
          ALTERNATIVE=$(readlink /etc/alternatives/x86_64-linux-gnu_gl_conf)
          if [ "$ALTERNATIVE" = "/usr/lib/nvidia-375/ld.so.conf" ]; then
              # Update initramfs so that the blacklist ends up in the initramfs
              if [ -x /usr/sbin/update-initramfs ]; then
                  /usr/sbin/update-initramfs -u
  "

  it the case of user who are using intel then update driver from
  nvidia-375.20 to nvidia-375.82 will get screen dark after prime-select
  nvidia later.

  syslog:
  "
  NVRM: loading NVIDIA UNIX x86_64 Kernel Module 375.20 Tue Nov 15 16:49:10 PST 2016 (using threaded interrupts)
  ......
  NVRM: API mismatch: the client has the version 375.82, but
  NVRM: this kernel module has the version 375.20. Please
  NVRM: make sure that this kernel module and all NVIDIA driver
  NVRM: components have the same version.
  "

  The root cause is the nvidia kernel module in initramfs not be updated
  in this case.

  impacted issues:
  LP: #1653592

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