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[TJ <ubuntu@xxxxxx>]

Hit this again today with lightdm spamming the logs.

I'd left the PC for about 45 minutes; came back to a backlit but black
display and no response to input.

I connected via SSH and found lightdm had TWO instances of X running,
one on tty7 and the other on tty8

I could find no clues in any of the logs as to what caused it; no signs
of errors or crashes. the Xorg.1.log for tty8 showed the GPU couldn't
obtain resources and failed (presumably due to tty7 with the first X
instance).

14:43:30 lightdm[1704]: /etc/modprobe.d is not a file
14:43:30 lightdm[1704]: message repeated 3 times: [ /etc/modprobe.d is not a file]
14:43:30 lightdm[1704]: update-alternatives: error: no alternatives for x86_64-linux-gnu_gfx
core_conf
14:43:30 lightdm[1704]: /etc/modprobe.d is not a file
14:43:30 lightdm[1704]: message repeated 3 times: [ /etc/modprobe.d is not a file]
14:43:30 lightdm[1704]: update-alternatives: error: no alternatives for x86_64-linux-gnu_gfxcore_conf
...
15:25:04 lightdm[1704]: /etc/modprobe.d is not a file
15:25:04 lightdm[1704]: message repeated 3 times: [ /etc/modprobe.d is not a file]
15:25:04 lightdm[1704]: update-alternatives: error: no alternatives for x86_64-linux-gnu_gfxcore_conf
15:25:04 lightdm[1704]: /etc/modprobe.d is not a file
15:25:04 lightdm[1704]: message repeated 3 times: [ /etc/modprobe.d is not a file]
15:25:04 lightdm[1704]: update-alternatives: error: no alternatives for x86_64-linux-gnu_gfxcore_conf

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to ubuntu-drivers-common in Ubuntu.
https://bugs.launchpad.net/bugs/1452610

Title:
  /etc/modprobe.d is not a file

Status in lightdm package in Ubuntu:
  Triaged
Status in ubuntu-drivers-common package in Ubuntu:
  Triaged

Bug description:
  /var/log/upstart# cat lightdm.log
  /etc/modprobe.d is not a file
  /etc/modprobe.d is not a file
  /etc/modprobe.d is not a file
  /etc/modprobe.d is not a file
  update-alternatives: error: no alternatives for x86_64-linux-gnu_gfxcore_conf
  /etc/modprobe.d is not a file
  /etc/modprobe.d is not a file
  /etc/modprobe.d is not a file
  /etc/modprobe.d is not a file
  update-alternatives: error: no alternatives for x86_64-linux-gnu_gfxcore_conf
  /etc/modprobe.d is not a file
  /etc/modprobe.d is not a file
  /etc/modprobe.d is not a file
  /etc/modprobe.d is not a file
  update-alternatives: error: no alternatives for x86_64-linux-gnu_gfxcore_conf

  Above looks weird... modprobe.d is a directory & why update-
  alternatives are called?!

  This is lightdm 1.10.5-0ubuntu1

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