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[Bug Watch Updater <854986@xxxxxxxxxxxxxxxxxx>]

Launchpad has imported 16 comments from the remote bug at
https://bugs.freedesktop.org/show_bug.cgi?id=41057.

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On 2011-09-20T22:13:33+00:00 Bryce Harrington wrote:

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

Reply at: https://bugs.launchpad.net/ubuntu-boot-
speed/+bug/854986/comments/4

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On 2011-09-20T22:15:23+00:00 Bryce Harrington wrote:

Created attachment 51426
BootDmesg.txt

Reply at: https://bugs.launchpad.net/ubuntu-boot-
speed/+bug/854986/comments/5

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On 2011-09-20T22:15:37+00:00 Bryce Harrington wrote:

Created attachment 51427
CurrentDmesg.txt

Reply at: https://bugs.launchpad.net/ubuntu-boot-
speed/+bug/854986/comments/6

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On 2011-09-20T22:17:02+00:00 Bryce Harrington wrote:

Created attachment 51428
farnsworth-oneiric-20110920-9.png

Reply at: https://bugs.launchpad.net/ubuntu-boot-
speed/+bug/854986/comments/7

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On 2011-09-20T22:17:17+00:00 Bryce Harrington wrote:

Created attachment 51429
XorgLog.txt

Reply at: https://bugs.launchpad.net/ubuntu-boot-
speed/+bug/854986/comments/8

------------------------------------------------------------------------
On 2011-09-20T22:17:30+00:00 Bryce Harrington wrote:

Created attachment 51430
Xrandr.txt

Reply at: https://bugs.launchpad.net/ubuntu-boot-
speed/+bug/854986/comments/9

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On 2011-09-20T22:37:21+00:00 Bryce Harrington wrote:

I had Chris disable disconnected outputs via his /etc/X11/xorg.conf,
which brought probing time from  ~0.5s to ~0.13s, however it did not
affect the Xorg startup time (still ~5sec).  Then, having him connect an
external monitor and disable eDP1 brought the startup time down to ~3.6
sec.

<chrisccoulson> the other big delay seems to be here:
<chrisccoulson> [    11.508] drmOpenDevice: open result is 12, (OK)
<chrisccoulson> [    13.231] drmOpenByBusid: Searching for BusID pci:0000:00:02.0

Not sure what to make of that.

Reply at: https://bugs.launchpad.net/ubuntu-boot-
speed/+bug/854986/comments/11

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On 2011-09-20T22:44:09+00:00 Bryce Harrington wrote:

User says this is a recently purchased machine; the issue is not known
to be a regression.

At XDC, Keith Packard indicated that eDP was difficult to support; I'm
assuming that's what's to blame here.

Reply at: https://bugs.launchpad.net/ubuntu-boot-
speed/+bug/854986/comments/12

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On 2011-09-20T22:51:38+00:00 Chris Wilson wrote:

Let's attack this one as being the slightly easy of the two, and
hopefully should give some insight into the pair.

Can we get an strace of X starting along with a perf report? Something like strace -t -o x.strace X -ac
perf record -f -g -a X -ac && perf report | cat > x.perf

And see if we capture any obvious clues.

Reply at: https://bugs.launchpad.net/ubuntu-boot-
speed/+bug/854986/comments/14

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On 2011-09-20T22:57:25+00:00 Bryce Harrington wrote:

We had Chris also test the kernel at
http://kernel.ubuntu.com/~sarvatt/macbook-air/, which is keithp's reworking of
eDP modesetting.

This brought it down to ~2sec with eDP enabled, and also fixed a ~5sec
modprobe.

Reply at: https://bugs.launchpad.net/ubuntu-boot-
speed/+bug/854986/comments/15

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On 2011-09-20T23:12:53+00:00 Bryce Harrington wrote:

<chrisccoulson> bryceh, ah, this is going to be fun. that drm delay only
happens at startup, so i can't just run another xserver manually with
strace :/

Reply at: https://bugs.launchpad.net/ubuntu-boot-
speed/+bug/854986/comments/17

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On 2011-09-20T23:28:58+00:00 Bryce Harrington wrote:

Possibly this is a dupe of
https://bugs.freedesktop.org/show_bug.cgi?id=39533#c67 ?

Reply at: https://bugs.launchpad.net/ubuntu-boot-
speed/+bug/854986/comments/18

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On 2011-09-20T23:33:04+00:00 Bryce Harrington wrote:

For reference, background on the boot speed analysis in general:
https://wiki.ubuntu.com/DesktopTeam/11.10/BootSpeedAnalysis

Reply at: https://bugs.launchpad.net/ubuntu-boot-
speed/+bug/854986/comments/19

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On 2011-09-21T08:35:06+00:00 Chris Wilson wrote:

Ok, eDP has quite a few spurious and long delays that hopefully can be
replaced with the shorter delays in the correct places that Keith is
working on. I think having adding initcall_debug along with a builtin
i915.ko will be most useful then. (That iirc gives the times of each
function entry/exit.)

Reply at: https://bugs.launchpad.net/ubuntu-boot-
speed/+bug/854986/comments/20

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On 2011-09-27T21:31:15+00:00 Eugeni Dodonov wrote:

Also, perhaps it could be related to bug #41059 too? Could you please
try with the patches attached to that bug?

One of them should fix the problem directly in i915 driver. Another
relies on more advanced bit testing carried out by i2c_algo_bit. Both
has reduced the display detection delay greatly in my case - from over
4s to 0.366s in the worst case.

Reply at: https://bugs.launchpad.net/ubuntu-boot-
speed/+bug/854986/comments/23

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On 2011-10-18T11:02:05+00:00 Eugeni Dodonov wrote:

There was no feedback on my question :), but the patch in question which
should fix both this and bug #41059 has landed into intel-gfx mailing
list.

Reply at: https://bugs.launchpad.net/ubuntu-boot-
speed/+bug/854986/comments/25


** Bug watch added: freedesktop.org Bugzilla #39533
   https://bugs.freedesktop.org/show_bug.cgi?id=39533

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https://bugs.launchpad.net/bugs/854986

Title:
  [eDP1] 5 second delay between Xorg starting and the greeter starting
  (Dell Latitude E6410)

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