Only one screen working on a dualscreen setup [solved]

altrevo · 2012-09-01 23:33:37

I own a Radeon HD58XX GPU and I'm trying to configure it for an HDMI FullHD screen and a DVI monitor with Xinerama.
I took the most elaborate example off the wiki and modified it and ended up with output only from the HDMI screen.

/etc/X11/xorg.conf.d/90-serverlayout.conf

Section "ServerLayout"
  Identifier   "Main"
  Screen       0 "Primary"
  Screen       1 "LargeDisplay" RightOf "Primary"
EndSection

/etc/X11/xorg.conf.d/20-radeon.conf

Section "Device"
  Identifier  "HD5800"
  Driver      "radeon"

  # Need to flag this as only referring to one output on the card
  Screen      0
EndSection

Section "Device"
  Identifier  "HD5800b"
  Driver      "radeon"
  # This is the second output on this card
  Screen      1
EndSection

/etc/X11/xorg.conf.d/30-screen-LargeDisplay.conf

Section "Monitor"
  Identifier   "Large"
EndSection

Section "Screen"
  Identifier   "LargeDisplay"
  Device       "HD5800b"
  Monitor      "Large"
  DefaultDepth 24
  SubSection "Display"
    Depth     24
    Modes     "1920×1080"
  EndSubsection
EndSection

/etc/X11/xorg.conf.d/30-screen-Primary.conf

Section "Monitor"
Identifier	"Main"
EndSection

Section "Screen"
    Identifier     "Primary"
    Device         "HD5800"
    Monitor        "Main"
    DefaultDepth    24
    SubSection "Display"
        Depth          24
        Modes          "1680x1050_75.00"
    EndSubSection
EndSection

What did I miss?
Also, How do I implement Xinerama? I got it to work once but I'd be glad if someone would post a working configuration file for a reference.

Last edited by altrevo (2012-09-09 02:58:26)

ConnorBehan · 2012-09-02 07:22:44

The Xinerama part would be

Option "Xinerama" "on"
Option "Clone" "off"

in a "ServerLayout" section. The way you have it, the screens might be accessible if you press Ctrl+Alt+F7 and Ctrl+Alt+F8.

But are you sure you want to use Xinerama and thereby disable 3D acceleration and compositing? Xrandr is superior if you are using dualhead on the same card. Xinerama has mainly been used by people with multiple cards.

altrevo · 2012-09-02 19:09:40

Thanks for the tip Connor, Didn't know about xrandr.
I fixed it by clearing out the conf files and just doing it through xrandr and it works great.

ConnorBehan · 2012-09-02 19:28:56

So I guess this is [solved]?

Arch Linux

#1 2012-09-01 23:33:37

Only one screen working on a dualscreen setup [solved]

#2 2012-09-02 07:22:44

Re: Only one screen working on a dualscreen setup [solved]

#3 2012-09-02 19:09:40

Re: Only one screen working on a dualscreen setup [solved]

#4 2012-09-02 19:28:56

Re: Only one screen working on a dualscreen setup [solved]

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