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 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-radeonhd in ubuntu. _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp