Comment 11 for bug 854986

Forwarding this bug from Ubuntu reporter Chris Coulson:

  https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/854986

[Problem]
Output probing is traced to causing a multi-second delay during boot.

Some experimentation by the reporter and others seeing same/similar issues show that by forcing off disconnected outputs, the boot speed is significantly improved.

[Original Report]
I've been looking at our session startup time this week, and I've got one of the big delays right down already (bug 854101). However, the next biggest offender is Xorg (when starting a 2d session) - there appears to be a ~5s delay between Xorg starting and the greeter loading.

You can see this in the bootchart attached.

Looking at the timestamps in my Xorg.0.log shows a pretty big delay just here:

[ 15.583] (II) intel(0): Initializing HW Cursor
[ 18.030] (II) intel(0): RandR 1.2 enabled, ignore the following RandR disabled message.

18 seconds matches up perfectly on the bootchart with the lightdm greeter starting.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xserver-xorg 1:7.6+7ubuntu7
ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
Uname: Linux 3.0.0-11-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 1.23-0ubuntu1
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,vpswitch,regex,snap,move,resize,gnomecompat,mousepoll,grid,place,imgpng,unitymtgrabhandles,animation,session,workarounds,wall,fade,scale,expo,ezoom,unityshell]
CompositorRunning: None
Date: Tue Sep 20 19:58:36 2011
DistUpgraded: Fresh install
DistroCodename: oneiric
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GraphicsCard:
 Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:040a]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110901)
MachineType: Dell Inc. Latitude E6410
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-11-generic root=UUID=b2e419c9-361b-45c5-8964-3ee8ca387122 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/15/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: 04373Y
dmi.board.vendor: Dell Inc.
dmi.board.version: A03
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA07:bd02/15/2011:svnDellInc.:pnLatitudeE6410:pvr0001:rvnDellInc.:rn04373Y:rvrA03:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6410
dmi.product.version: 0001
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.5.94+bzr20110919-0ubuntu1~ppa1
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1