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Hello,
Using ubuntu 10.10 on a laptop DELL E5510, I experiment frequent crashes (related to x or not, I can't be sure, but probably) when connecting an external video projector.
More precisely, this does not happen when connecting, but when I tried to activate it, using either the screen dialog, or xrandr: suddenly, screen turns black, sometimes with mouse pointer still visible, but not always. No response from machine (ctrl-F1 to access a console does not work). Sometimes I am able to recover control by resetting X-server (CTRL-ALT-Backspace, that I have re-enabled), sometimes not, and I need to hard-reset machine by pressing power button for 5 seconds.

On second boot, it usually works (maybe because the thing is connected
from the beginning of boot ?)

I must say also I have a strange error message at boot, that might (?)
be related, about "unable to fetch i915 symbols" or something
approaching. It disappears from screen, and I don't know where to find
log of boot messages.

Additional output:

"lspci | grep VGA" gives:
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)

"sudo lshw -C video" gives
 *-display
       description: VGA compatible controller
       product: Core Processor Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 02
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:47 memory:f0000000-f03fffff memory:e0000000-efffffff ioport:8080(size=8)

Feel free to contact me if more information needed.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: xorg 1:7.5+6ubuntu3
ProcVersionSignature: Ubuntu 2.6.35-24.42-generic 2.6.35.8
Uname: Linux 2.6.35-24-generic i686
Architecture: i386
DRM.card0.DisplayPort.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1366x768 1366x768
 edid-base64: AP///////wAGr+wlAAAAAAATAQSVIhN4AsiVnldUkiYPUFQAAAABAQEBAQEBAQEBAQEBAQEB9BpWPFAAJjAgGDQAWMEQAAAa+BFWPFAAJjAgGDQAWMEQAAAaAAAA/gBUNUNEUoBCMTU2WFcyAAAAAAAAQSEZAAAAAAkBCiAgAHA=
DRM.card0.DisplayPort.2:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes: 
 edid-base64:
DRM.card0.DisplayPort.3:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes: 
 edid-base64:
DRM.card0.HDMI_Type_A.1:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes: 
 edid-base64:
DRM.card0.HDMI_Type_A.2:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes: 
 edid-base64:
DRM.card0.VGA.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1680x1050 1280x1024 1280x1024 1152x864 1024x768 1024x768 800x600 800x600 640x480 640x480 720x400
 edid-base64: AP///////wAQrBTQTTQzMRcRAQNoLx547o8wo1VJmCcUUFSlSwBxT4GAAQEBAQEBAQEBAQEBITmQMGIaJ0BosDYA2SgRAAAcAAAA/wBEVDg2Nzc2NTEzNE0KAAAA/QA4Sx5TDwAKICAgICAgAAAA/ABERUxMIEUyMjhXRlAKAOE=
Date: Thu Jan 20 14:17:46 2011
InstallationMedia: Xubuntu 10.10 "Maverick Meerkat" - Release i386 (20101008.1)
MachineType: Dell Inc. Latitude E5510
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-24-generic root=UUID=fb5179a4-3e5d-4b6e-890c-0c85353b4e6b ro quiet splash
ProcEnviron:
 LANG=fr_FR.utf8
 SHELL=/bin/bash
SourcePackage: xorg
dmi.bios.date: 07/08/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 09M4GV
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA04:bd07/08/2010:svnDellInc.:pnLatitudeE5510:pvr0001:rvnDellInc.:rn09M4GV:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E5510
dmi.product.version: 0001
dmi.sys.vendor: Dell Inc.
glxinfo: Error: [Errno 2] Aucun fichier ou dossier de ce type
system:
 distro:             Ubuntu
 codename:           maverick
 architecture:       i686
 kernel:             2.6.35-24-generic

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


** Tags: apport-bug i386 maverick
-- 
frequent x crashing when connecting external video
https://bugs.launchpad.net/bugs/705418
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