On 12/02/2013 12:00, Roberto Ragusa wrote:
On 02/12/2013 11:22 AM, Gordan Bobic wrote:
On 12/02/2013 09:42, Roberto Ragusa wrote:
I worked out a solution (but it is not easy) where I drive the LCD with Intel
and the external VGA with Nvidia.
The secondary X server can be run and stopped indipendently, it is actually
a good setup if you have to use a projector, because you have the LCD with your
usual desktop and the VGA with just what you need to be shown.
I described how I did it some time ago here.
I'll try to find that, it sounds like exactly the sort of setup I am planning
to use on my new system. The only downside I can see is that once you fire up
the apps on the secondary X server you cannot drag the windows back to the
primary.
You could, however, create a conf file for multiple display adapters with different
drivers on the same X server. Last time I used such a setup was circa RH9/RHEL3
(pre-Fedora, using Matrox Millenium and ATI Mach64 cards), but I don't see any reason why
it wouldn't work (unless it is one of many things that got lobotomized over time for no
good reason at all - but that's a whole different rant that I'm not going to go off on
right now). Whether such a setup is "pluggable", i.e. will support
adding/removing monitors/adapters/screens dynamically without a restart, I don't know - I
never tried.
It is pluggable. Not automatic, but you can switch the VGA on and off with no
issues
(including disabling Nvidia for power saving).
As you have two X servers, you are right, you can't drag things across.
But:
1) you can have two sessions for the same user (using different DEs,
in my case KDE as primary and fluxbox as secondary), so you have access
to all your files.
I'm interesting in a similar but slightly different use-case.
Say I have 2 monitors and to GPUs. The primary monitor/GPU is always on
Linux on bare metal. The secondary GPU I want to dynamically switch
between the host (with the running X server) and a KVM VGA passthrough
guest. For example, drag all my windows to the primary monitor, fire up
the VM, and have X gracefully lose the secondary GPU without a restart.
And similarly in reverse, hot-add itself the GPU again when the VM
terminates and stretch onto the second screen again.
Unfortunately, I haven't found a way to do that yet without a Xorg
restart. Hence why your 2-Xorg solution with separate logins is
appealing as a workaround with reasonable functionality.
2) If you have VNC activated on the secondary, you will "remote" control it
from the primary. Very useful, you can jump with the mouse inside what
is projected, do something, than jump back out.
Have you looked into Synergy for that. :)
If you are interested search for:
"Re: nvidia optimus tricks (was: F16 - Adding a second video card)"
(24 July 2012)
Most interesting, I'll take a look at that.
Gordan
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