Two Graphics Cards, Wayland, and KDE?

[Thomas Vaughan]

My favorite desktop is KDE. At the moment, however, I have to reboot to MS Windows in order to take full advantage of all three of the monitors on my desk.

I'd like to make it so that my monitor setup works as well under Debian.

The dock for my Dell laptop has two DVI ports and a VGA port. The two DVI ports are driven by an Nvidia graphics device, and the VGA port is driven by an Intel graphics device.

I have a monitor connected to each port.

Yes, I have been able to configure 'xorg.conf' to enable Xinerama, and I can then use all three monitors.

The problem is that, well, it's Xinerama, and so (1) I can't drag a window from one graphics subsystem to the other, and (2) OpenGL doesn't get hardware acceleration on every screen.

However, everything just seems to work in a unified way under MS Windows.

I have read that Wayland will enable the right solution.

Is this right?

If so, then is it possible, say, to run Debian unstable with KDE on top of Wayland rather than on top of X? That is, can I somehow get Wayland to unify the display produced by the two different graphics subsystems and then run something like KDE on top of it?

Even now, on Debian unstable?

Or is there another solution?

--
Thomas E. Vaughan

[Christopher Dow]

I'm not sure about Wayland (I'm actually interested in the answer to this myself). However, xserver 1.14 introduced xrandr 1.4 which allows you to use multiple GPUs for a single desktop. This replaces Xinerama which has long been deprecated. I am currently using it to run 3 monitors through 2 GPUs.

To use it I run the command 'xrandr --setprovideroutputsource 1 0' (you may need to flip the 1 and 0) after login. After that I am able to enable the extra monitor in the KDE display manager. This may only work if you are using the open source drivers since I'm not sure NVidia has added support to the propiatary drovers for xrandr 1.4.


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[john Culleton]

On Fri, 13 Jun 2014 08:53:17 -0700
Christopher Dow <chris...@gmail.com> wrote:

> I'm not sure about Wayland (I'm actually
> interested in the answer to this myself).
> However, xserver 1.14 introduced xrandr 1.4
> which allows you to use multiple GPUs for a
> single desktop. This replaces Xinerama which
> has long been deprecated. I am currently using
> it to run 3 monitors through 2 GPUs.
>
> To use it I run the command 'xrandr
> --setprovideroutputsource 1 0' (you may need to
> flip the 1 and 0) after login. After that I am
> able to enable the extra monitor in the KDE
> display manager. This may only work if you
> are using the open source drivers since I'm not
> sure NVidia has added support to the propiatary
> drovers for xrandr 1.4.
>
>

I use xrandr 1.4.1 and have a Nvidia card on my
slackware system.

If you call xrandr with no parameters the user
should see what video ports are available.
Here is what I get:

xrandr
Screen 0: minimum 8 x 8, current 1024 x 768,
maximum 8192 x 8192

DVI-I-0 disconnected primary (normal left
inverted right x axis y axis)

VGA-0 disconnected (normal left inverted right x
axis y axis)

DVI-I-1 connected 1024x768+0+0
(normal left inverted right x axis y axis) 480mm
x 270mm
1920x1080 60.0 +
1440x900 59.9
1280x1024 75.0 60.0
1280x800 59.8
1152x864 75.0
1024x768 70.1* 60.0
800x600 60.3 56.2
640x480 59.9

I use XFCE instead of KDE most of the time but
xrandr works with either.
--
John Culleton
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