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I cannot get the desktop to clone either.
I have a laptop yes, with and external crt monitor hooked up to screen port. So now I am trying to clone or span the desktop between the laptop lcd and the external crt monitor. Make sense?If I use the function key "fn" and F5 I can swop between the crt monitor and my lcd laptop display. I can span the desktops when I boot into my windows partition, but I want to trash that partition...
My xorg.conf was written by the system-config-display script.
Here is my xorg.conf :
# Xorg configuration created by system-config-display
# RgbPath is the location of the RGB database. Note, this is the name of the
# file minus the extension (like ".txt" or ".db"). There is normally
# no need to change the default.
# Multiple FontPath entries are allowed (they are concatenated together)
# By default, Red Hat 6.0 and later now use a font server independent of
# the X server to render fonts.
# Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
# Option "Xleds" "1 2 3"
# To disable the XKEYBOARD extension, uncomment XkbDisable.
# Option "XkbDisable"
# To customise the XKB settings to suit your keyboard, modify the
# lines below (which are the defaults). For example, for a non-U.S.
# keyboard, you will probably want to use:
# Option "XkbModel" "pc102"
# If you have a US Microsoft Natural keyboard, you can use:
# Option "XkbModel" "microsoft"
# Then to change the language, change the Layout setting.
# For example, a german layout can be obtained with:
# Option "XkbLayout" "de"
# Option "XkbLayout" "de"
# Option "XkbVariant" "nodeadkeys"
# If you'd like to switch the positions of your capslock and
# control keys, use:
# Option "XkbOptions" "ctrl:swapcaps"
# Or if you just want both to be control, use:
# Option "XkbOptions" "ctrl:nocaps"
Option "XkbModel" "pc105"
Option "XkbLayout" "gb"
This is for my Desktop, however, I am using an LCD display. I used the gtf command to generate the modelines. On my laptop, I had to use it to generate a modeline for 1024x800 resolution. I don't use spanning. Both displays are independent. On some laptops, the second screen can be either the CRT output or the S-Video video output.
As an interesting side note, and perhaps some help, previously on my laptop, if I would start the X server, the virtual terminal outputs would be scrambled after that, even after logging out of KDE. (This is with the laptop) I found out by accident that the S-Video video output would display fine. So I was able to make changes when my Regular screen wasn't set right, by editing the config using the S-Video input on my television.
For me on a laptop with a single GPU. It apparently has multihead support. Although there's no DRI if you use it.
On the server layout.
Option "Xinerama" "on"
Option "Clone" "off"
Although I found that if I comment out all of the multiple head / monitor configurations, it'll do clone mode with a virtual desktop on the smaller screens by default.
What exactly are you trying to do? What distro, kernel, card, driver, blah blah blah.
I tend to grab my modes out of the /var/log/Xorg.0.log log file. Noting that the open radeon driver has more modes supported than the closed fglrx driver. And that neither offers DRI with a xinerama setup. But I've got a low end ATI card on my cheap < $400 laptop.
Also you can manually setup a virtual setting with Virtual 1280 800 in proximity of your Viewport 0 0 line for Section "Screen". Replacing the resolution specs accordingly.
In my experience most cards support most things in 16 bit colors. Although my experiece with this particular ATI card is that modes other than 24 bit colors don't even give a viewable screen. Although the radeon driver works in other color modes. But not with DRI for this chipset (r400). Also, going the xinerama route seems to expose all of the quirky bugs in the closed drivers. Getting the most current driver is probably a good idea if going that route.