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["sebastien.caille" <sebastien.caille@xxxxxxxxx>]

Hello,

I had the same issue and managed to get back to a sane situation

To summarize (more details below), the pattern I saw on my laptop is:
- it works fine as long as the default screen configuration is used (that is, default screen resolution, default screen position)
 (actually, no log "switch to mode" in Xorg.0.log)
- to work around the issue: I switched to vt1, waited for a while (maybe 30 seconds, I'm not 100% sure), switched back to vt7. Then the login screen was displayed and I was able to log in. 
- It works better after applying the default configuration using the System Settings (the login screen appears after a reboot)

Installed packages:
xserver-xorg-core          2:1.17.2-1ubuntu9  
xserver-xorg-video-intel   2:2.99.917+git20150808-0ubuntu4
nvidia-355                 355.11-0ubuntu0~gpu15.10.1

Hardware is Intel HD Graphics 4600 + NVIDIA GT740M
[     2.612] (--) PCI:*(0:0:2:0) 8086:0416:1043:122d rev 6, Mem @ 0xf7400000/4194304, 0xd0000000/268435456, I/O @ 0x0000f000/64
[     2.612] (--) PCI: (0:1:0:0) 10de:1292:1043:122d rev 161, Mem @ 0xf6000000/16777216, 0xe0000000/268435456, 0xf0000000/33554432, I/O @ 0x0000e000/128, BIOS @ 0x????????/524288

Outputs are eDP1 (laptop's screen, 1600x900) and HDMI1 (1920x1080) (now
they are named eDP-1-0 and HDMI-1-0... could be an update I applied)

Xorg correctly loads the drivers, prime-offload correctly associates the cards.
Then blank screen

After some vt switches, the login screen appeared on vt7. 
The display was corrupted (only for a while), the screen resolution was unusual and I had the same display on both screens.

The last vt switch likely matches the log at 67.771 (it's definitely an
unusual resolution, with mirror mode)

[     3.460] (WW) config/udev: device ETPS/2 Elantech Touchpad already added. Ignoring.
[     3.808] (II) intel(G0): switch to mode 1600x900@60.0 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none
[     3.855] (II) intel(G0): switch to mode 1600x900@60.0 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none
[     4.646] (II) intel(G0): switch to mode 1920x1080@60.0 on HDMI1 using pipe 1, position (1600, 0), rotation normal, reflection none
[    34.168] (II) NVIDIA(0): Setting mode "NULL"
[    34.169] (II) intel(G0): switch to mode 1600x900@60.0 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none
[    34.169] (II) intel(G0): switch to mode 1920x1080@60.0 on HDMI1 using pipe 1, position (1600, 0), rotation normal, reflection none
[    34.256] (--) synaptics: ETPS/2 Elantech Touchpad: touchpad found
[    36.296] (II) NVIDIA(0): Setting mode "NULL"
[    36.297] (II) intel(G0): switch to mode 1600x900@60.0 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none
[    36.297] (II) intel(G0): switch to mode 1920x1080@60.0 on HDMI1 using pipe 1, position (1600, 0), rotation normal, reflection none
[    36.356] (--) synaptics: ETPS/2 Elantech Touchpad: touchpad found
[    64.086] (II) NVIDIA(0): Setting mode "NULL"
[    64.086] (II) intel(G0): switch to mode 1600x900@60.0 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none
[    64.086] (II) intel(G0): switch to mode 1920x1080@60.0 on HDMI1 using pipe 1, position (1600, 0), rotation normal, reflection none
[    64.176] (--) synaptics: ETPS/2 Elantech Touchpad: touchpad found
[    67.596] (II) XKB: reuse xkmfile /var/lib/xkb/server-53A4CFD27CBE694B87E57086754C176B71A8EEB5.xkm
[    67.771] (II) intel(G0): switch to mode 1440x900@59.9 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none
[    67.773] (II) intel(G0): switch to mode 1440x900@59.9 on HDMI1 using pipe 1, position (0, 0), rotation normal, reflection none

Then I was able to log in and use xrandr to change the resolutions and position of the screens.
I'm not certain, but I probably tried to change the configuration from the System Settings/Display tool, too.

After a reboot the lightdm's login immediately appeared and I was able
to log in.

At this point, the logs "switch to mode" do not appear in Xorg.0.log
anymore.

The configuration is 
eDP-1-0 connected primary 1600x900+0+0 382mm x 215mm
   1600x900      60.01*+
HDMI-1-0 connected 1920x1080+1600+0 521mm x 293mm
   1920x1080     60.00*+  50.00    59.94  

HDMI-1-0 at the right of eDP-1-0

Then I tried to "invert" the screens (HDMI output left of eDP output) from the System Settings.
After two attempts, the change was taken into account. 

After a reboot, the Xorg server started to segfault after the login.

To fix: I switched to vt1, waited a few seconds, then switched back to vt7. Then I was able to log in (with the displays back to the original configuration - HDMI output at the right of eDP output)
Then I applied the default display configuration using the System Settings.

Now I can correctly log in, even after a reboot.
However, at the moment, trying to use xrandr to change the display configuration crashes xorg.

[   195.951] (EE) 
[   195.951] (EE) Backtrace:
[   195.951] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x5615e28a462e]
[   195.951] (EE) 1: /usr/bin/X (0x5615e26f0000+0x1b8999) [0x5615e28a8999]
[   195.951] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f3cdb36f000+0x352f0) [0x7f3cdb3a42f0]
[   195.951] (EE) 3: /usr/bin/X (DamageRegister+0x11) [0x5615e282b3a1]
[   195.951] (EE) 4: /usr/bin/X (0x5615e26f0000+0xd9ac8) [0x5615e27c9ac8]
[   195.951] (EE) 5: /usr/bin/X (BlockHandler+0x8a) [0x5615e274ccca]
[   195.951] (EE) 6: /usr/bin/X (WaitForSomething+0x163) [0x5615e28a1393]
[   195.951] (EE) 7: /usr/bin/X (0x5615e26f0000+0x57fa1) [0x5615e2747fa1]
[   195.951] (EE) 8: /usr/bin/X (0x5615e26f0000+0x5c34b) [0x5615e274c34b]
[   195.951] (EE) 9: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7f3cdb38fa40]
[   195.951] (EE) 10: /usr/bin/X (_start+0x29) [0x5615e27366c9]
[   195.951] (EE) 
[   195.951] (EE) Segmentation fault at address 0x10
[   195.952] (EE) 
Fatal server error:
[   195.952] (EE) Caught signal 11 (Segmentation fault). Server aborting

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to nvidia-graphics-drivers in Ubuntu.
https://bugs.launchpad.net/bugs/1501041

Title:
  No visible display in ubuntu session when using nvidia drivers via
  nvidia-prime until screen goes to sleep, then waked up

Status in lightdm package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers package in Ubuntu:
  Invalid
Status in ubuntu-drivers-common package in Ubuntu:
  Confirmed
Status in unity-greeter package in Ubuntu:
  Invalid
Status in xfce4-session package in Ubuntu:
  Invalid
Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  ** this appears to be that the display is blanked/asleep at greeter & login.
  Forcing or waiting for screen to blank/sleep then waking up restores display
  See comments 8 & 10 for further info, demonstrations **

  Please note that this bug is being filed on a recent 15.10 Ubuntu
  image install but from a gnome session

  In a nutshell -
  Once nividia drivers are installed & used from nvidia-prime there is no longer a visible display in unity-greeter nor in an ubuntu session once logged in. (a blind log in successfully loads an ubuntu session.
  Everything in the ubuntu session works fine, there are no errors & all the related logs look ok, there is just no visible display.

  I can open apps, run commands, copy/create logs, play music, play
  videos, just no display so has to be done blindly from keyboard.

  On the other hand if I install gnome-shell & log in (blindly) to a
  gnome session from greeter then all is well & I get a visible
  display.

  The same behaviour is seen on an Xubuntu image install, once nvidia is
  installed & switched to, no visible display. Again there installing &
  logging into a gnome session works fine with visible display

  nvidia driver version doesn't matter, exact same is seen with current
  15.10 versions & the one I'm currently using (355) from drivers ppa.

  ** this appears to be that the display is blanked/asleep at greeter & login.
  Forcing or waiting for screen to blank/sleep then waking up restores display
  See comment 8 for further info **

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xserver-xorg-core 2:1.17.2-1ubuntu7
  ProcVersionSignature: Ubuntu 4.2.0-11.13-generic 4.2.1
  Uname: Linux 4.2.0-11-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.19-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Tue Sep 29 16:15:21 2015
  DistUpgraded: Fresh install
  DistroCodename: wily
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.7, 4.2.0-11-generic, x86_64: installed
   nvidia-355, 355.11, 4.2.0-11-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:3801]
   NVIDIA Corporation GK107M [GeForce GT 755M] [10de:0fcd] (rev ff) (prog-if ff)
  InstallationDate: Installed on 2015-09-28 (0 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150928)
  MachineType: LENOVO 20217
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-11-generic.efi.signed root=UUID=3712249e-a4c8-4b29-9ffb-f9f9e7d5259a ro quiet splash vt.handoff=7
  SourcePackage: xorg-server
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/18/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 74CN44WW(V3.05)
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: VIQY0Y1
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058STD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad Y510P
  dmi.modalias: dmi:bvnLENOVO:bvr74CN44WW(V3.05):bd09/18/2013:svnLENOVO:pn20217:pvrLenovoIdeaPadY510P:rvnLENOVO:rnVIQY0Y1:rvr31900058STD:cvnLENOVO:ct10:cvrLenovoIdeaPadY510P:
  dmi.product.name: 20217
  dmi.product.version: Lenovo IdeaPad Y510P
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.12.2+15.10.20150908-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.0-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.0-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Tue Sep 29 16:05:24 2015
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                 729
   vendor                                     LGD
  xserver.version: 2:1.17.2-1ubuntu7

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