[Libdlo] Multihead X.org failed (solved)

[Thomas Siedlich]

Hi!

It's time for an update:

On Sat, 6/25/11, Thomas Siedlich <thomas.siedlich at yahoo.com> wrote:
> I want to run a dualhead (the aim is tripplehead) setup
> with a Displaylink and an Intel device:
> 
> Intel (on mainboard):
> VGA compatible controller: Intel Corporation 82852/855GM
> Integrated Graphics Device (rev 02)
> 
> Displaylink (HIS Multi-View II Adapter):
> udlfb: DisplayLink AN2440D3
> 
> Monitor:
> Eizo S2431W with a native resolution of 1920x1200
> 
> Kernel: 2.6.39.2
>   with Bill Katsaks patch
>   see <http://lists.freedesktop.org/archives/libdlo/2011-June/000939.html>
> 
> X.org: 7.6
> 
> OS: Debian testing
> 
> Results
> =======
> 
> :-| *** xf-video-udlfb ***
>   from <http://git.plugable.com/gitphp/index.php?p=xf-video-udlfb>
> Works only singlehead
> If intel is configured as screen0, X.org unloads
> displaylink.
> If displaylink is configured as screen0, X.org unloads
> intel.

:-) *** xf-video-udlfb ***
Works if...

* The displaylink device has to be screen 0.
  (Otherwise it gets unloaded after the intel configuration)

* All "Device" sections have to set the Driver option
  (This solves the unload problem of the intel module after
   the displaylink configuration).

Now should dual screen already working.

***If you want Xinerama:
* All "Screen" sections have to set to the same Depth.

* RightOf/LeftOf in the section "ServerLayout" doesn't work.
  Use the Absolute configuration option.
  (With LeftOf/RightOf I got only a cloned display)

This xorg.conf works for me for dualhead:
-----------------------------------8<---------------
Section "ServerLayout"
	Identifier	"Toms layout"
	Screen		0		"Screen left"	Absolute 0 0
	Screen		1		"VGAout"	Absolute 1920 0
	Option		"Xinerama"	"true"
EndSection

Section "Device"
        Identifier      "Intel855GM"
	Driver		"intel"
        Option          "Monitor-VGA1"  "EizoS2431"
        Option          "Monitor-LVDS1" "LVDSout"
EndSection

Section "Monitor"
	Identifier	"EizoS2431"
EndSection

Section "Monitor"
	Identifier	"LVDSout"
	Option		"Ignore"	"True"
EndSection

Section "Screen"
	Identifier	"VGAout"
	Device		"Intel855GM"
	Monitor		"EizoS2431"
	DefaultDepth	16
EndSection


Section "Device"
	Identifier      "HIS DL L"
	Driver		"displaylink"
	Option		"fbdev"		"/dev/fb1"
EndSection

Section "Monitor"
        Identifier      "EizoS2433L"
EndSection

Section "Screen"
        Identifier      "Screen left"
	Device		"HIS DL L"
        Monitor         "EizoS2433L"
	DefaultDepth	16
EndSection
--------------------------->8-------------------------

Hope this helps someone.

Now it's time to test triplehead :-).

Thomas