Second monitor on Dell XPS 8300 (with ATI HD 6670) just flicks after reboot

[Luiz Angelo Daros de Luca]

I installed kubuntu beta2 from LiveCD. After installing, it reboots as expected. Since then, just after grub, my second display just starts to flick. It shows at the first top 10px the content of this display (which also flicks but shows some content). I'll attach a photo to show the problem. This is my xrandr status:

$ xrandr
Screen 0: minimum 320 x 200, current 3200 x 1080, maximum 16384 x 16384
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected 1920x1080+1280+0 (normal left inverted right x axis y axis) 510mm x 287mm
   1920x1080 60.0*+
   1280x1024 75.0 60.0
   1152x864 75.0
   1024x768 75.1 60.0
   800x600 75.0 60.3
   640x480 75.0 60.0
   720x400 70.1
VGA-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
   1280x1024 60.0*+ 75.0
   1280x960 60.0
   1152x864 75.0
   1024x768 75.1 70.1 60.0
   832x624 74.6
   800x600 72.2 75.0 60.3 56.2
   640x480 72.8 75.0 66.7 60.0
   720x400 70.1

And this is my VGA

01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Turks [Radeon HD 6670]

The selected and detected resolutions seems to be OK. No matter which resolution I choose, nothing changes, except if I turn the VGA screen off.

LiveCD beta2 had no problem. Maybe this is some kind of regression or some kernel parameter stuff.

This is a clean installation on a clean machine. I did not tested with 11.10, except for a livecd that worked flawlessly.

I looked for something at logs but I found nothing that seems to be interesting.

PS: I updated the system with all suggested packages.
PS2: I did not installed any packages other than default ones but vim and firefox

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+12ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-21.34-generic 3.2.13
Uname: Linux 3.2.0-21-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.0-0ubuntu1
Architecture: amd64
Date: Fri Mar 30 23:33:49 2012
InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
ProcEnviron:
 LANGUAGE=pt_BR:pt:en
 TERM=xterm
 LANG=pt_BR.UTF-8
 SHELL=/bin/bash
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)

[Bryce Harrington (bryce)]

Try reproducing with the regular Ubuntu LiveCD (not kubuntu), and if it reproduces file a bug report using `ubuntu-bug xorg` so it'll attach the logs we require.

[Luiz Angelo Daros de Luca (luizluca)]

I guess it really does not make difference between kubuntu and ubuntu, as they share the same kernel and xorg and the problem is present before kde (kdm) gets on.

Anyway, I'll download the ubuntu livecd.