Public bug reported:

I have a Nvidia GTX 670. I tried the nouveau driver. At boot, it takes a
unusual long time then finally shows me gdm3 and everything is working
after. But echo $XDG_SESSION_TYPE is set to "x11". Reading the logs, I
can see that after multiple failures to launch wayland, it falls back to
X11.

I added an attachement of journalctl -b -1 where it fails with nouveau
(I'm filling the bug after reinstalling nvidia proprietary driver).

lspci -v
01:00.0 VGA compatible controller: NVIDIA Corporation GK104 [GeForce GTX 670] 
(rev a1) (prog-if 00 [VGA controller])
        Subsystem: eVga.com. Corp. GK104 [GeForce GTX 670]
        Flags: bus master, fast devsel, latency 0, IRQ 29
        Memory at f6000000 (32-bit, non-prefetchable) [size=16M]
        Memory at e8000000 (64-bit, prefetchable) [size=128M]
        Memory at f0000000 (64-bit, prefetchable) [size=32M]
        I/O ports at e000 [size=128]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: nvidia
        Kernel modules: nvidiafb, nouveau, nvidia_384_drm, nvidia_384

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: xorg 1:7.7+19ubuntu3
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  384.90  Tue Sep 19 19:17:35 
PDT 2017
 GCC version:  gcc version 7.2.0 (Ubuntu 7.2.0-8ubuntu3)
.proc.driver.nvidia.warnings.fbdev:
 Your system is not currently configured to drive a VGA console
 on the primary VGA device. The NVIDIA Linux graphics driver
 requires the use of a text-mode VGA console. Use of other console
 drivers including, but not limited to, vesafb, may result in
 corruption and stability problems, and is not supported.
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
BootLog:
 [  OK  ] Started LSB: Speech Dispatcher.
 [  OK  ] Started LSB: automatic crash report generation.
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sun Oct 22 11:37:08 2017
DistUpgraded: Fresh install
DistroCodename: artful
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.8, 4.13.0-16-generic, x86_64: installed
 nvidia-384, 384.90, 4.13.0-16-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 NVIDIA Corporation GK104 [GeForce GTX 670] [10de:1189] (rev a1) (prog-if 00 
[VGA controller])
   Subsystem: eVga.com. Corp. GK104 [GeForce GTX 670] [3842:2678]
InstallationDate: Installed on 2017-09-17 (34 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170915)
MachineType: System manufacturer System Product Name
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-16-generic 
root=UUID=567a9b2b-0864-450e-9cfe-dab7a54b9fce ro rootflags=subvol=@ quiet 
splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/28/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0501
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: P8Z77-V LX2
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0501:bd09/28/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8Z77-VLX2:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.83-1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.2-0ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.2-0ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.19.5-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20170309-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
xserver.bootTime: Sun Oct 22 11:26:32 2017
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.19.5-0ubuntu2

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful ubuntu

** Attachment added: "nouveau-fails-wayland.log"
   
https://bugs.launchpad.net/bugs/1725949/+attachment/4984472/+files/nouveau-fails-wayland.log

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https://bugs.launchpad.net/bugs/1725949

Title:
  nouveau drivers fails to start a wayland session and fallback to x11

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