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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1346096

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1346096

Title:
  [drm:init_ring_common] *ERROR* render ring initialization failed

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  After last apt-get dist-upgrade my computer can not start with a
  graphic environment. It start but it's freeze in login screen (cursor
  blink not blink, it's all screen locked).

  I only can login into my Ubuntu from Grub > Advanced options > resume.

  Computer: Toshiba Satellite Pro U400-182 with Intel graphic card
  (Intel GM45 Chipset).

  Ubuntu version: Ubuntu 14.10 Utopic Unicorn (development branch)

  Kernel: Linux 3.16.0-4-generic #9-Ubuntu SMP Mon Jul 14 11:55:55 UTC
  2014 x86_64 x86_64 x86_64 GNU/Linux

  Error in syslog is:

  Jul 18 11:00:14 lito-Ubuntu kernel: [    2.420468] [drm:init_ring_common] *ERROR* render ring initialization failed ctl 0001f001 (valid? 1) head 00000304 tail 00000000 start 00503000 [expected 00503000]
  Jul 18 11:00:14 lito-Ubuntu kernel: [    2.420478] [drm:i915_gem_init] *ERROR* Failed to initialize GPU, declaring it wedged

  Xorg log:

  [    11.900] (II) intel: Driver for Intel(R) Integrated Graphics Chipsets:
          i810, i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G,
          915G, E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM,
          Pineview G, 965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33,
          GM45, 4 Series, G45/G43, Q45/Q43, G41, B43
  [    11.901] (II) intel: Driver for Intel(R) HD Graphics: 2000-5000
  [    11.901] (II) intel: Driver for Intel(R) Iris(TM) Graphics: 5100
  [    11.901] (II) intel: Driver for Intel(R) Iris(TM) Pro Graphics: 5200
  [    11.901] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
  [    11.901] (II) FBDEV: driver for framebuffer: fbdev
  [    11.901] (II) VESA: driver for VESA chipsets: vesa
  [    11.901] (++) using VT number 7

  [    11.927] (EE) open /dev/dri/card0: No such file or directory
  [    11.927] (WW) Falling back to old probe method for modesetting
  [    11.927] (EE) open /dev/dri/card0: No such file or directory

  No errors in dmesg

  Related intel packages:

  ii  intel-gpu-tools        1.7-1            amd64            tools for debugging the Intel graphics driver
  ii  libdrm-intel1:amd64    2.4.54-1         amd64            Userspace interface to intel-specific kernel DRM
  ii  libdrm-intel1:i386     2.4.54-1         i386             Userspace interface to intel-specific kernel DRM
  un  libva-intel-vaapi-driv <none>           <none>           (no description available)
  ii  xserver-xorg-video-int 2:2.99.910-0ubun amd64            X.Org X server -- Intel i8xx, i9xx display driver

  Thanks in advance.

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