Thanks for reporting this bug and any supporting documentation. Since
this bug has enough information provided for a developer to begin work,
I'm going to mark it as confirmed and let them handle it from here.
Thanks for taking the time to make Ubuntu better!

** Description changed:

  Binary package hint: xorg
  
  Using a fresh daily build of Intrepid (tried both the live cd and an
  installation made with the alternate cd):
  
  Xorg fails when an external monitor is connected to my laptop (Dell
  Inspiron 6400, ATI X1400 graphics card) through a KVM switch. After a
  scrambled splash screen, the screen goes black.
  
  The problem does not to occur when the monitor is unplugged or connected
  to the laptop directly (instead of through the switch). It also works
  fine in Hardy.
  
  In case it is relevant, this is the KVM switch: 
http://www.equip-info.net/english/index.php?main=10&gruppe=300&prod=2188
  The monitor is a Samsung SyncMaster 930BF.
  
  Excerpt from lspci:
  
  01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Radeon
  Mobility X1400 [1002:7145]
  
  Excerpt from discover:
  
  ATI Technologies Inc Radeon Mobility X1400
+ 
+ Logfiles:
+ 
+ xorg.0.log with ext-Monitor: 
http://launchpadlibrarian.net/16776938/Xorg.10.log
+ xorg.0.log without Monitor: http://launchpadlibrarian.net/16776933/Xorg.0.log
+ xorg.0.log with autoconfig: http://launchpadlibrarian.net/17034798/Xorg.0.log

** Changed in: xserver-xorg-driver-ati (Ubuntu)
Sourcepackagename: xorg => xserver-xorg-driver-ati
       Status: Incomplete => Confirmed

** Summary changed:

- [radeon] xorg fails in dual-screen setup
+ [radeon] xorg gives black screen with external monitor connected

** Summary changed:

- [radeon] xorg gives black screen with external monitor connected
+ [radeon] xorg gives black screen with external monitor connected through 
KVM-switch

-- 
[radeon] xorg gives black screen with external monitor connected through 
KVM-switch
https://bugs.launchpad.net/bugs/257941
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