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[Rene Greuel <1449560@xxxxxxxxxxxxxxxxxx>]

I reinstalled my laptop with wily (15.10) while hoping kernel 4.2.0.7
could fix the problem. I got a step forward. The drm related error is
gone, but a seg fault rises up in Xorg.log and I ended up in a black
screen when switching to nvidia:

[  1704.596] (EE) intel(G0): failed to set mode: Permission denied [13]
[  1704.612] (EE) 
[  1704.612] (EE) Backtrace:
[  1704.616] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x56276b19962e]
[  1704.617] (EE) 1: /usr/bin/X (0x56276afe5000+0x1b8999) [0x56276b19d999]
[  1704.617] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7fe372b08000+0x352f0) [0x7fe372b3d2f0]
[  1704.617] (EE) 3: /usr/bin/X (RRTellChanged+0x35e) [0x56276b0fd08e]
[  1704.617] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe36ccbe000+0x7184d) [0x7fe36cd2f84d]
[  1704.617] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe36ccbe000+0x71bad) [0x7fe36cd2fbad]
[  1704.617] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe36ccbe000+0x7316d) [0x7fe36cd3116d]
[  1704.617] (EE) 7: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe36ccbe000+0x77af5) [0x7fe36cd35af5]
[  1704.617] (EE) 8: /usr/bin/X (0x56276afe5000+0x966b6) [0x56276b07b6b6]
[  1704.617] (EE) 9: /usr/bin/X (0x56276afe5000+0x136c92) [0x56276b11bc92]
[  1704.617] (EE) 10: /usr/bin/X (0x56276afe5000+0x5c3ec) [0x56276b0413ec]
[  1704.617] (EE) 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7fe372b28a40]
[  1704.617] (EE) 12: /usr/bin/X (_start+0x29) [0x56276b02b6c9]
[  1704.617] (EE) 
[  1704.617] (EE) Segmentation fault at address 0x3d0
[  1704.617] (EE) 
Fatal server error:
[  1704.617] (EE) Caught signal 11 (Segmentation fault). Server aborting
[  1704.617] (EE) 
[  1704.617] (EE) 
Please consult the The X.Org Foundation support 
         at http://wiki.x.org
 for help.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1449560

Title:
  Cannot login with Nvidia Optimus hardware installed(Ubuntu 15.04)

Status in xserver-xorg-video-intel package in Ubuntu:
  Confirmed

Bug description:
  I have Nvidia Optimus GT415M hardware on my laptop.

  I've upgraded my Ubuntu 14.10 where everything was working fine with
  Nvidia Optimus  to Ubuntu 15.04 and now I cannot login. After I type
  the password login screen comes back again.

  I did complete reinstall of NVidia packages and installed new
  nvidia-346 package from Ubuntu repo.

  Looking at Xorg.0.log I see this message:
  [   120.353] (EE) intel(G1): [drm] failed to set drm interface version: Permission denied [13].
  [   120.353] (II) intel(G1): [drm] Contents of '/sys/kernel/debug/dri/0/clients':
  [   120.353] (II) intel(G1): [drm] a dev	pid    uid	magic
  [   120.354] (II) intel(G1): [drm] 
  [   120.354] (II) intel(G1): [drm] y   0  2996     0          0
  [   120.354] (II) intel(G1): [drm] y   0  2996     0          0
  [   120.354] (EE) intel(G1): Failed to claim DRM device.

  And I have found thread regarding this problem on
  https://devtalk.nvidia.com/default/topic/816599/prime-switching-to-
  nvidia-creates-black-screen/. So looks like hardware similar to mine
  need a new version of xserver-xorg-video-intel.

  Could you please help with this.

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