Dear Everybody: I upgraded an F8 system to F9 and noticed the dual monitors were not working anymore. I mean, they were no longer a panorama. They were clones. system-config-display does not seem to run on this system. When I try to use it to turn on dual heads, it just stalls. I mean, If I click the dual head tab and activate the button, then the program won't accept an OK click and it will only cancel. In the X logs, I found that merged FB no longer is supported, and xrandr is needed to make this work. I gather that Xinerama is now deprecated, and we need to make xrandr do the job. I didn't find any webpages that told me exactly what I needed, but stumbled to the solution. So I had to do some digging about xrandr. In a terminal, you type $ xrandr You see the list of video outputs (monitors?) the system knows about, on mine they are DVI-0 and DVI-1. Some people report they see "LVDS" or "VGA". If you want to test your system out, you can experiment with xrandr from the command line. The syntax to take the two devices I see, DVI-0 and DVI-1, and put them side by side, is basically like this $ xrandr --output DVI-0 --mode 1280x1024 --output DVI-1 --mode 1280x1024 --right-of DVI-0 If xrandr works at all with your system, you should see the screen resize and the workspace stretches across 2 screens. Some people, who are silly in my opinion, say the user should put that command in their startup scripts. It seems better to me to put it in the xorg.conf. I'm attaching a working xorg.conf. The required changes concerned declaring the two monitor devices in relation to the xrandr names for them, DVI-0 and DVI-1, and then setting the Screen attribute to have a wide virtual size and refer to the first device. Here is the problem I have not solved yet. I do see a workspace that is 2560x1024 and can drag applications across the 2 monitors. xdpyinfo gives the "right answer"--one big workspace screen #0: dimensions: 2560x1024 pixels (676x270 millimeters) resolution: 96x96 dots per inch depths (7): 24, 1, 4, 8, 15, 16, 32 root window id: 0x7d However, I cannot find a window manager that is able to treat the whole workspace as one big space. In Metacity (under Gnome), it seems to see a dividing line between the two monitors. The panel is limited to the first monitor. In the previous xorg, this was a problem as well with Xinerama or whatever. There were tricks that were used to make the window manager see the whole desktop. For example, for the radeon merged frame buffer that I used to use in this particular machine, the option that helped was: Option "MergedXinerama" "FALSE" And for the WindowMaker, with an Nvidia card and the nvidia proprietary driver, the option was: Option "NoTwinViewXineramaInfo" "true" In the XrandR documentation, I can't see a similar option. I hope my advice and xorg.conf help you make the first step, and I also hope you can help me with this last step. -- Paul E. Johnson Professor, Political Science 1541 Lilac Lane, Room 504 University of Kansas
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