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I'm running Ubuntu 13.10 (Saucy) on a MacbookPro9,1, which has both an
Nvidia GeForce GT 650M and an integrated Intel HD Graphics 4000
controller.  I boot with EFI and use the Nouveau driver.

On this machine logging out is slow, taking maybe 10 seconds or so.
'top' shows that the X server process uses lots of CPU during logout.  I
ran sysprof and it attributes much of the CPU time to
nouveau_connector_detect, called via the following:

system_call_fastpath [48.98%]
 sys_ioctl [41.90%]
  do_vfs_ioctl [41.87%]
   drm_ioctl [41.47%]
    drm_mode_getconnector [34.14%]
     drm_helper_probe_single_connector_modes [34.14%]
      nouveau_connector_detect [28.84%]
      nouveau_connector_detect_lvds [3.83%]
      intel_crt_detect [1.48%]

The percentages above are of the total CPU time used in the shutdown sequence, so I think several seconds of time is being spent in the path above.  That doesn't seem right.
--- 
ApportVersion: 2.10.2-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  adam       1744 F.... pulseaudio
 /dev/snd/controlC0:  adam       1744 F.... pulseaudio
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
DistUpgraded: Fresh install
DistroCodename: saucy
DistroRelease: Ubuntu 13.10
DistroVariant: ubuntu
DkmsStatus:
 bcmwl, 6.30.223.30+bdcom, 3.9.0-4-generic, x86_64: installed
 bcmwl, 6.30.223.30+bdcom, 3.9.0-5-generic, x86_64: installed
 bcmwl, 6.30.223.30+bdcom, 3.9.0-6-generic, x86_64: installed
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Apple Inc. Device [106b:00fb]
 NVIDIA Corporation GK107M [GeForce GT 650M Mac Edition] [10de:0fd5] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Apple Inc. Device [106b:00fc]
HibernationDevice: RESUME=UUID=97a27f76-3baf-42fe-b6fc-5bee91c831ca
InstallationDate: Installed on 2013-06-10 (5 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130609)
MachineType: Apple Inc. MacBookPro9,1
MarkForUpload: True
NonfreeKernelModules: wl
Package: xserver-xorg-video-nouveau 1:1.0.8-0ubuntu1
PackageArchitecture: amd64
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB:
 0 nouveaufb
 1 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.9.0-6-generic root=UUID=3ca362e9-34d3-4c77-8a5a-07ecf66b8619 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.9.0-6.13-generic 3.9.6
RelatedPackageVersions:
 linux-restricted-modules-3.9.0-6-generic N/A
 linux-backports-modules-3.9.0-6-generic  N/A
 linux-firmware                           1.109
Tags:  saucy saucy ubuntu reproducible
Uname: Linux 3.9.0-6-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 08/08/2012
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP91.88Z.00D3.B08.1208081132
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-4B7AC7E43945597E
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro9,1
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-4B7AC7E43945597E
dmi.modalias: dmi:bvnAppleInc.:bvrMBP91.88Z.00D3.B08.1208081132:bd08/08/2012:svnAppleInc.:pnMacBookPro9,1:pvr1.0:rvnAppleInc.:rnMac-4B7AC7E43945597E:rvrMacBookPro9,1:cvnAppleInc.:ct10:cvrMac-4B7AC7E43945597E:
dmi.product.name: MacBookPro9,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
version.compiz: compiz 1:0.9.9~daily13.04.18.1~13.04-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.45-2ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.1.3-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.1.3-0ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.13.3-0ubuntu12
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2b2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.9-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.8-0ubuntu1
xserver.bootTime: Sat Jun 15 20:09:48 2013
xserver.configfile: default
xserver.errors:
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.13.3-0ubuntu12
xserver.video_driver: nouveau

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Triaged

** Affects: xserver-xorg-video-nouveau (Ubuntu)
     Importance: Medium
         Status: Confirmed


** Tags: apport-collected kernel-bug-exists-upstream reproducible saucy ubuntu
-- 
logout is slow, profiling reveals lots of CPU time in nouveau_connector_detect
https://bugs.launchpad.net/bugs/1191426
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