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[Marshal <marshal@xxxxxxxxxx>]

Public bug reported:

Binary package hint: xorg

On a Toshiba L505D laptop (with an ATI M880G [Mobility Radeon HD 4200]), running Maverick, when X starts, there is only a blank screen, and a cursor which consists of a flat multicolored line.  This cursor can be moved, and ctrl-alt-f1 can be used to 
switch to a console.  The console displays numerous "Failed to schedule ib" messages.  This is with gdm and starting X manually with startx.

Following the instructions at
https://wiki.ubuntu.com/X/KernelModeSetting I disabled KSM, and now X
works normally.  Specifically, I created /etc/modprobe.d/radeon-kms.conf
with the following contents:

options radeon modeset=0

The only downside I can see is that the console now has an 80 column
display on a widescreen monitor, but this is minor.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: xorg 1:7.5+6ubuntu3
ProcVersionSignature: Ubuntu 2.6.35-15.21-generic 2.6.35.1
Uname: Linux 2.6.35-15-generic x86_64
Architecture: amd64
Date: Mon Aug 16 00:46:31 2010
InstallationMedia: Xubuntu 10.04 "Lucid Lynx" - Beta amd64 (20100406)
MachineType: TOSHIBA Satellite L505D
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-15-generic root=UUID=ef0aa0b6-e823-4cfa-bf75-decadca70115 ro quiet splash
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: xorg
Symptom: display
dmi.bios.date: 12/17/2009
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: 1.10
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Portable PC
dmi.board.vendor: TOSHIBA
dmi.board.version: Base Board Version
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: AMD
dmi.chassis.version: None
dmi.modalias: dmi:bvnInsydeCorp.:bvr1.10:bd12/17/2009:svnTOSHIBA:pnSatelliteL505D:pvrPSLV6U-00J001:rvnTOSHIBA:rnPortablePC:rvrBaseBoardVersion:cvnAMD:ct10:cvrNone:
dmi.product.name: Satellite L505D
dmi.product.version: PSLV6U-00J001
dmi.sys.vendor: TOSHIBA
glxinfo: Error: [Errno 2] No such file or directory
system:
 distro:             Ubuntu
 codename:           maverick
 architecture:       x86_64
 kernel:             2.6.35-15-generic

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


** Tags: amd64 apport-bug maverick

-- 
Blank X screen when KMS is enabled
https://bugs.launchpad.net/bugs/618507
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