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Message #134362
[Bug 1449560] Re: Cannot login with Nvidia Optimus hardware installed(Ubuntu 15.04)
It really seems to be related to drm for i915 driver when switching to
nvidia via prime-select and login via lightdm. The Xorg.0.log shows an
error like:
[ 25.199] (EE) intel(G1): [drm] failed to set drm interface version: Permission denied [13].
[ 25.199] (II) intel(G1): [drm] Contents of '/sys/kernel/debug/dri/0/clients':
[ 25.199] (II) intel(G1): [drm] command pid dev master a uid magic
[ 25.199] (II) intel(G1): [drm] Xorg 2173 0 y y 0 0
[ 25.199] (II) intel(G1): [drm] Xorg 2173 0 n y 0 0
[ 25.199] (EE) intel(G1): Failed to claim DRM device.
I found a thread with an alternative workaround:
http://vxlabs.com/2015/02/05/solving-the-ubuntu-14-04-nvidia-346-nvidia-prime-black-screen-issue/
by switching the intel driver to modesetting in xorg.conf and preventing the gpu-manager from reverting. But I'm not really interested in doing a manual hack every time I want to switch.
I hope this will be fixed soon, at the latest when switching to "wily".
--
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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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References