Comment 0 for bug 1346096

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

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 4.10 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.