On 03/28/17 00:52, stan wrote:
On Mon, 27 Mar 2017 12:37:30 +0000
Eigeldinger Simon <simon.eigeldinger(a)hohenems.at> wrote:
> Hi Ed,
>
> Here's a extract from an article about this matter:
> Source:
http://blog.zorinaq.com/the-5-second-vga-dummy-plug/
>
> It made sense for drivers to not enable a GPU when no monitor was
> attached to it. But since the rise of GPGPU applications, graphics
> vendors AMD and NVIDIA realized that this behavior was inconvenient.
> At least with the most recent Linux drivers, dummy plugs are not
> necessary anymore.
>
> So I wonder if the problem lies somewhere else.
The first answer on this page tells how to fake an attached monitor on
linux using the dummy driver. On Fedora that is package
xorg-x11-drv-dummy-0.3.7-1.fc25.x86_64
It involves creating a dummy xorg.conf with the parameters you want,
since there is no edid to read from the monitor to automatically create
it.
It's for Ubuntu, but should work fine on Fedora.
http://askubuntu.com/questions/453109/add-fake-display-when-no-monitor-is...
There seem to be problems with it if an actual monitor is attached in
addition to the dummy, but that should not be a problem for you. If
necessary, though not stated there, it should be possible to create a
second configuration for the attached monitor, and then specify which
screen you want to load at X startup (it defaults to screen 0).
To me, all of this makes perfect sense when applied to an installed and
running system.
However, in the original post, Simon referred to booting a "Fedora
Workstation Live USB". AFAIK, the Live image does not contain the
xorg-x11-drv-dummy. Additionally, the way the Live image is structured
I don't believe there is the chance to make a configuration change to
the drivers that are being used.
That is why I only suggested the dummy plugs.
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