Hi there,

My current setup includes a PCI-X ATI X1600 board, which its dual DVI+VGA outputs.
That card has two 19' monitors connected, a DVI one and a VGA-only one, both LGs.

Now, suppose I don't want to buy another gfx board, but rather connect an external USB-to-VGA adapters like these:

http://goo.gl/TqchG

Would Fedora recognize the 3rd display (no matter it being much slower due to the USB 2.0 interface) and put the 3rd screen alongside the other two so I can move app windows from one monitor to the next?


Or would it be a separate X display because it's handled by a different driver?
TIA

FC
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Fernando Cassia <fcassia@gmail.com> writes:
> My current setup includes a PCI-X ATI X1600 board, which its dual
> DVI+VGA outputs.
> That card has two 19' monitors connected, a DVI one and a VGA-only one,
> both LGs.
> Now, suppose I don't want to buy another gfx board, but rather connect
> an external USB-to-VGA adapters like these:
> http://goo.gl/TqchG
> Would Fedora recognize the 3rd display (no matter it being much slower
> due to the USB 2.0 interface) and put the 3rd screen alongside the
> other two so I can move app windows from one monitor to the next?
> Or would it be a separate X display because it's handled by a different
> driver?

It might well recognize the usb framebuffer (I have no idea if it will
even do that.) The stumbling block will be to get the current Xorg to
span two framebuffers. Back in the early days of X11 it did have an
extension called Xinerama ( http://en.wikipedia.org/wiki/Xinerama ).
That extension appears to have suffered bit-rot and no longer works for
me. I tried to get two different Radeon frame buffers to work together
but ended up buying a new card that had at least three outputs. Sadly
those are hard to come by and they charge an arm and a leg.

-wolfgang
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On 04/17/2012 08:23 PM, Wolfgang S. Rupprecht wrote:


Fernando Cassia<fcassia@gmail.com> writes:

My current setup includes a PCI-X ATI X1600 board, which its dual
DVI+VGA outputs.
That card has two 19' monitors connected, a DVI one and a VGA-only one,
both LGs.
Now, suppose I don't want to buy another gfx board, but rather connect
an external USB-to-VGA adapters like these:
http://goo.gl/TqchG
Would Fedora recognize the 3rd display (no matter it being much slower
due to the USB 2.0 interface) and put the 3rd screen alongside the
other two so I can move app windows from one monitor to the next?
Or would it be a separate X display because it's handled by a different
driver?


It might well recognize the usb framebuffer (I have no idea if it will
even do that.) The stumbling block will be to get the current Xorg to
span two framebuffers. Back in the early days of X11 it did have an
extension called Xinerama ( http://en.wikipedia.org/wiki/Xinerama ).
That extension appears to have suffered bit-rot and no longer works for
me. I tried to get two different Radeon frame buffers to work together
but ended up buying a new card that had at least three outputs. Sadly
those are hard to come by and they charge an arm and a leg.


I've been researching triple-head for quite a while, and the lest evil
option I've come up with is the AMD FirePro 4900. It natively supports
triple head from one card, has Linux drivers and config tools available
from AMD, and is not horrifically expensive.


Have a look at
http://www.amd.com/us/products/workstation/graphics/ati-firepro-3d/Pages/product-comparison.aspx
for some comparisons of various video cards including how many monitors
they support.


Hope this helps.
Thomas
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On Tue, Apr 17, 2012 at 23:54, Thomas Cameron <thomas.cameron@camerontech.com> wrote:

I've been researching triple-head for quite a while, and the lest evil option I've come up with is the AMD FirePro 4900. It natively supports triple head from one card, has Linux drivers and config tools available from AMD, and is not horrifically expensive.




Have a look at http://www.amd.com/us/products/workstation/graphics/ati-firepro-3d/Pages/product-comparison.aspx for some comparisons of various video cards including how many monitors they support.




Hope this helps.

Thomas
Thanks, Thomas and Wolfgang!Yes, helps inmensely.

FC

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During times of Universal Deceit, telling the truth becomes a revolutionary act
Durante épocas de Engaño Universal, decir la verdad se convierte en un Acto Revolucionario

- George Orwell


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Thomas Cameron <thomas.cameron@camerontech.com> writes:
> I've been researching triple-head for quite a while, and the lest evil
> option I've come up with is the AMD FirePro 4900. It natively supports
> triple head from one card, has Linux drivers and config tools
> available from AMD, and is not horrifically expensive.
>
> Have a look at
> http://www.amd.com/us/products/workstation/graphics/ati-firepro-3d/Pages/product-comparison.aspx
> for some comparisons of various video cards including how many
> monitors they support.

I ended up buying an ATI FirePro 2460 (not shown on that chart). It is
very much a mixed blessing. It is fanless and has 4 DisplayPort outputs
and comes with a 4 adaptors to drive 4 single-link DVI (max. 1200x1600,
from memory) monitors. The downside is the price is ridiculous. The
card costs $235 while the same ATI 5430 CEDAR chip on a card with a
dvi/vga/hdmi output is ~$50. Xorg also doesn't yet deal with
displayport very well. Using the front panel soft-switches on the
monitors to keep them off when not using the computer causes the
displayes to wedge in an off state. The docs for that card do mention
it can drive vga with the appropriate displayport to vga adaptor cables,
but that sounds like a rather rude and expensive conversion hack at
~$20-$30/cable.

-wolfgang
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On Wed, Apr 18, 2012 at 02:49, Wolfgang S. Rupprecht <wolfgang.rupprecht@gmail.com> wrote:

The docs for that card do mention

it can drive vga with the appropriate displayport to vga adaptor cables,

but that sounds like a rather rude and expensive conversion hack at

~$20-$30/cable.
Well,my friend (btw: I noticed your profile on your google account that reads "software janitor" -I'm still laughing-... I think I must be "software mine-field cleaner" then ...


... if you knew that down here in .AR stores are still selling VGA-only monitors like hotcakes, and that only now store clerks have begun to understand what DVI is when you ask for one... and that there are almost no monitors with displayport on the mainstream retail channel... (only in a few places, 23" or higher, and at a premium price because those are thought to be for ' professional ' use whatever that means), and that displayport-to-vga adapters are available but retail for $35-40 greenbacks....


...then I think you' d feel better about your situation. <grin>

Again, thanks for your reply and your help/insight.
FC
--
During times of Universal Deceit, telling the truth becomes a revolutionary act

Durante épocas de Engaño Universal, decir la verdad se convierte en un Acto Revolucionario
- George Orwell


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