[Bug 27644] New: radeon KMS causes corrupt VGA output on X1400

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27644

           Summary: radeon KMS causes corrupt VGA output on X1400
           Product: DRI
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: sastraxi at gmail.com


(note first that this is connected to an Ubuntu bug report; take a look for
some potentially-helpful logs:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/562138)

Booting up the latest 10.04 daily live-cd of Ubuntu, 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
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.
system:
 distro: Ubuntu
 codename: lucid
 architecture: i686
 kernel: 2.6.32-20-generic

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