Because Xvnc is producing same "XINERAMA extension not supported by server" I am guessing that RedHat does not compile in xinerama support into their Xvnc. The other clue is that Xvnc does not list xinerama option when doing a "Xvnc -help". I am trying x11vnc with the Vesa X server and xinerama, but the x11vnc just hangs and I never see the 5900 with "netstat -ln". Thus getting connection refused when trying to connect. Any ideas why x11vnc is not fully starting? I have looked through the logs and such with no hints of wrong doing. Thank you for your reply.

Antoine Martin wrote:
On 05/28/2010 01:52 AM, Collins, Cris wrote:
I am trying to get dual heads and xinerama to work with Xvfb and getting:
xdpyinfo -ext XINERAMA

Xlib: extension "XINERAMA" missing on display ":0.0".
XINERAMA extension not supported by server
That's your answer.
Xvfb :90 -screen 0 1024x2048x24 +xinerama &
mwm :90&

I have also tried
Xvfb :90 -screen 0 1024x2048x24 -screen 1 1024x2048x24
and
Xvfb :90 -screen 0 1024x2048x24 -screen 1 1024x2048x24 +xinerama
The later Seg faults.

Any ideas why xinerama is not working.
I asked this same question a while back: Xvfb does not and will not support xinerama, but Xvnc and xorg-x11-vfb do.
You can try using those as alternatives.

Antoine
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