Dual monitors with CentOS 5.5 possible ?

[madbrain]

Sorry if this is a repost, but it doesn't appear the first post went through.
I tried to setup a VM with 2 virtual monitors. But the CentOS 5.5 guest doesn't appear to recognize it.
What are the xorg.conf settings that will work with this OS, if any ?

[Perryg]

AFAIK multi-monitor is a host function. I doubt that you can run dual in a guest.

[madbrain]

I don't think the host is relevant, and I don't think it needs to physically have multiple displays .
Virtualbox supports virtual monitors. See the "display" setting in the VM. I set that to 2.
This is supposed to allow the guest to use multiple virtual displays.
In fact, it does work for a Windows server 2003 guest. I can't get it to work for CentOS 5.5 guest.

FYI, my host is Windows 7 x64. And it does have 2 displays.

[Perryg]

So you set two monitors in the guest settings and fire up the guest. What do you actually see happen?

See Chapter 3.5 Display settings in your VirtualBox users guide.

[madbrain]

So you set two monitors in the guest settings and fire up the guest. What do you actually see happen?

See Chapter 3.5 Display settings in your VirtualBox users guide.

When I tried to set 2 monitors in the guest using the admin for CentOS, it produced a xorg.conf that caused the server to not even start. Obviously the wrong one. I had to backout to the previous version of xorg.conf. The admin GUI requires a set resolution for each monitor configured which is obviously incorrect.

CentOS 5.5 works fine with dynamic resolution with 1 monitor on the Innotek virtual graphics card.

I am in need of some manual xorg.conf settings since the CentOS GUI is not able to generate the correct one for the 2 virtual monitors.

These are the settings that work with 1 monitor . I have tried to fiddle with it by hand but no luck. I don't know if I am just supposed to create a second monitor, or also a 2nd video card and second screen. I just am not familiar with the syntax.

When I install the additions in the VM, it only sets things up with 1 monitor.

Section "Monitor"
Identifier "Monitor[0]"
ModelName "VirtualBox Virtual Output"
VendorName "Oracle Corporation"
EndSection

Section "Device"
BoardName "VirtualBox Graphics"
Driver "vboxvideo"
Identifier "Device[0]"
VendorName "Oracle Corporation"
EndSection

Section "Screen"
SubSection "Display"
Depth 24
EndSubSection
Device "Device[0]"
Identifier "Screen[0]"
Monitor "Monitor[0]"
EndSection

[Perryg]

Did you read Chapter 3.5 Display settings in your VirtualBox users guide?

[Technologov]

Nope, it won't work.

RHEL 5.x has Xorg server 1.1, while VBox only supports v1.3+ for Multi-Monitor Linux guests.