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[Cameron Gorrie <sastraxi@xxxxxxxxx>]

Public bug reported:

Binary package hint: xorg

Booting up the latest 10.04 daily live-cd, the VGA output is unusable.
It looks like an incorrect frequency, and the screen size is wrong (it's
too narrow for the resolution). The wavering/out-of-phase-ness is so bad
that it's impossible to read. This happens on both the X console and
X11, and goes away when I use the internal laptop LCD instead (LVDS). If
I use both screens in a mirror or extend mode, the same problems occur.
So, this led me to believe that the problem might be with Kernel Mode
Setting (KMS).

I added the options:
"radeon.modeset=0 vga=771"
to the livecd and, voila, no more corruption. Everything works again, and I can use my big LCD via VGA!

I've attached as much information as I can; I can also show a video of
the corruption. I had Ubuntu 8.10 on my computer previously; it's a Dell
Inspiron 6400 with Mobility X1400 graphics from ati. I'm using the April
13th Daily LiveCD here, but the corruption was evident at least with the
latest Beta livecd.

Let me know if I can give any more information!

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-20.30-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-20-generic i686
Architecture: i386
Date: Tue Apr 13 04:48:04 2010
DkmsStatus: Error: [Errno 2] No such file or directory
GdmLog1: Error: command ['gksu', '-D', 'Apport', '--', 'cat', '/var/log/gdm/:0.log.1'] failed with exit code 1: cat: /var/log/gdm/:0.log.1: No such file or directory
GdmLog2: Error: command ['gksu', '-D', 'Apport', '--', 'cat', '/var/log/gdm/:0.log.2'] failed with exit code 1: cat: /var/log/gdm/:0.log.2: No such file or directory
LiveMediaBuild: Ubuntu 10.04 "Lucid Lynx" - Alpha i386 (20100413)
MachineType: Dell Inc. MM061
ProcCmdLine: initrd=/ubninit file=/cdrom/preseed/hostname.seed boot=casper quiet radeon.modeset=0 vga=771 BOOT_IMAGE=/ubnkern
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: xorg
Symptom: display
dmi.bios.date: 04/20/2007
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A15
dmi.board.name: 0XD720
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA15:bd04/20/2007:svnDellInc.:pnMM061:pvr:rvnDellInc.:rn0XD720:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: MM061
dmi.sys.vendor: Dell Inc.
glxinfo: Error: [Errno 2] No such file or directory
system:
 distro:             Ubuntu
 codename:           lucid
 architecture:       i686
 kernel:             2.6.32-20-generic

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


** Tags: apport-bug i386 kms lucid modeset r500 radeon vga x1400

-- 
radeon KMS causes corrupt VGA output on X1400
https://bugs.launchpad.net/bugs/562138
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