[Inspiron N4050, Vostro 1450, Vostro V131] Compiz works unnormally after external VGA connected.

[TienFu Chen]

Connected external VGA for few times(generally within 3 times), the gnome windows will work unnormally.
See the attached picture.
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Affected system:
Dell Inspiron N4050(201104-7938)
Dell Vostro 1450(201104-7889)
Dell Inspiron N4050(201104-7891)
Dell Vostro V131(201105-8049)
Dell Vostro 1550(201105-8077)
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ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: linux-image-3.0.0-12-generic 3.0.0-12.20
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ubuntu 1533 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0xf7f00000 irq 45'
   Mixer name : 'Intel CougarPoint HDMI'
   Components : 'HDA:111d76d1,10280502,00100205 HDA:80862805,80860101,00100000'
   Controls : 18
   Simple ctrls : 10
Date: Thu Oct 27 05:49:44 2011
HibernationDevice: RESUME=UUID=d8bdcf15-ac42-483b-90ec-de57d69ac02a
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
MachineType: Dell Inc. Inspiron N4050
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=b2c8742c-82f3-48ad-88db-040f37fff0e9 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.0.0-12-generic N/A
 linux-backports-modules-3.0.0-12-generic N/A
 linux-firmware 1.60
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/01/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: X08
dmi.board.name: 4IU010
dmi.board.vendor: Dell Inc.
dmi.board.version: X08
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: dmi:bvnDellInc.:bvrX08:bd04/01/2011:svnDellInc.:pnInspironN4050:pvrNotSpecified:rvnDellInc.:rn4IU010:rvrX08:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: Inspiron N4050
dmi.product.version: Not Specified
dmi.sys.vendor: Dell Inc.

[TienFu Chen (ctf)]

gnome task panel disappeared, windows unable to move. Totally can't work.

[Ara Pulido (ara)]

Moving to compiz

[Ara Pulido (ara)]

This is failing 11.10 certification for several systems coming from enablement

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Chris Van Hoof (vanhoof)]

Heya Timo -- Mind taking a quick glance here to see what the problem may be on these three machines?

[Timo Aaltonen (tjaalton)]

Compiz crashes here when the layout changes from external only to extended, but compiz restarts ok here when it didn't for Tim. Needs further digging to see why it crashes.

[Kent Baxley (kentb)]

For those hitting this, grab the ~/.xsession-errors file as the problem occurs and see if you have the following listed in the log:

https://bugs.launchpad.net/ubuntu/+source/unity/+bug/838128

If so, this might be a dup of the above bug.

[Robert Hooker (sarvatt)]

This is https://bugs.launchpad.net/ubuntu/+source/unity/+bug/838128 going by ~/.xsession-errors when it happens

[TienFu Chen (ctf)]

I'm not sure if this is same as bug 838128.
Before I started to reproduce this bug, I removed ~/.xsession-errors and /var/log/Xorg.0.log, then I reproduced the bug, then tried to open ~/.xsession-errors and /var/log/Xorg.0.log, but the files were not even created.
So I looked at the /var/log/syslog, what I saw clearly is that every time I unplug/plug the external monitor cable, I can see the message:
xxxxxxxxxxxxx kernel: [xxxxxxxx] [drm:pch_irq_handler] *ERROR* PCH poison interrupt

However I see the same error message as bug 838128 in the old .xsession-errors I saved.

[Timo Aaltonen (tjaalton)]

marked it as a dupe, since I get the exact same error here..