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[damahevi <damahevi@xxxxxxxxx>]

Same Problem with Kubuntu 10.04 Lucid Lynx AMD64 default install:

Summary: switching off KMS with boot parameter and custom xorg helped
(see below), fix for KMS and dualhead detection needed.

Detail:

In System Settings -> Display -> Multiple Montors 
I got the message that on my system I don't have multiple monitors. However I see the cloned view. 
If I tree to change the settings from clone to left or right display gets totally scrambled (i.e. many coulored lines and noise), only sysrq-k helped (who disabled ctrl-alt-bsp per default !?).

Then I tried xrandr:
xrandr --output DVI-0 --right-of VGA-0 --mode 1280x1024
with the same result scrambled display!

When I used a customized xorg.conf it seemed to wrok but kdm restarts itself after about 10 minutes!!!
The only log-entries  I found were:
kdm.log:QFileSystemWatcher: failed to add paths: /tmp/0659673494/.config/ibus/bus
kdm.log:Bus::open: Can not get ibus-daemon's address. 
kdm.log:IBusInputContext::createInputContext: no connection to ibus-daemon


So I changed the file  /etc/default/grub:                                             

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.modeset=0"

and after a sudo grub-update everything works!

There seems to be a problem with raeon driver and KMS with dual-head
display!

My xorg.conf:
Section "Device"
        Identifier      "Configured Video Device"
        Option          "monitor-VGA-0" "VGA"
        Option          "monitor-DVI-0"   "Extern"
EndSection

Section "Monitor"
        Identifier      "VGA"
        Option          "PreferredMode" "1280x1024"
        Option          "Right Of" "Extern"
EndSection

Section "Monitor"
        Identifier      "Extern"
        Option          "PreferredMode" "1280x1024"
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Device          "Configured Video Device"
        DefaultDepth    24
        SubSection "Display"
            Depth       24
            Virtual     2560 1024
        EndSubSection
EndSection

Section "ServerLayout"
        Identifier      "Default Layout"
        Screen          "Default Screen"
EndSection

Excerpt of lspci -vvv:

01:05.0 VGA compatible controller: ATI Technologies Inc RS480 [Radeon Xpress 200G Series]
        Subsystem: Hewlett-Packard Company Device 3009
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 64 (2000ns min), Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 17
        Region 0: Memory at d0000000 (32-bit, prefetchable) [size=128M]
        Region 1: I/O ports at cc00 [size=256]
        Region 2: Memory at fdaf0000 (32-bit, non-prefetchable) [size=64K]
        [virtual] Expansion ROM at fda00000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel modules: radeon

01:05.1 Display controller: ATI Technologies Inc Radeon Xpress Series (RS480)
        Subsystem: Hewlett-Packard Company Device 3008
        Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Region 0: Memory at c8000000 (32-bit, prefetchable) [disabled] [size=128M]
        Region 1: Memory at fdae0000 (32-bit, non-prefetchable) [disabled] [size=64K]
        Capabilities: <access denied>

-- 
Kubuntu 9.04 + Radeon X1300 - No dual monitor option in system settings (dual-head)
https://bugs.launchpad.net/bugs/367776
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