Olav,
Try setting up the projector as an additional display using xrandr. That may
be what you need. I have used xrandr on Slackware and Red Hat Enterprise 6.8
environments to use multiple displays. I also believe you can set up fvwm to
create multiple displays that are independent of each other. Check the
Xinerama settings in fvwm configuration. I have never tried this however. But
I found this: https://a3nm.net/blog/xrandr.html and it might help.
Don
This is the xrandr man page from Slackware 14.0.
XRANDR(1)
XRANDR(1)
NAME
xrandr - primitive command line interface to RandR extension
SYNOPSIS
xrandr [-help] [-display display] [-q] [-v] [--verbose] [--dryrun]
[--screen snum] [--q1] [--q12]
RandR version 1.3 options
[--current] [--noprimary]
Per-output options
[--panning
widthxheight[+x+y[/track_widthxtrack_height+track_x+track_y[/border_left/border_top/border_right/bor-
der_bottom]]]] [--scale xxy] [--transform a,b,c,d,e,f,g,h,i] [--primary]
RandR version 1.2 options
[--prop] [--fb widthxheight] [--fbmm widthxheight] [--dpi dpi]
[--newmode name mode] [--rmmode name] [--addmode
output name] [--delmode output name]
Per-output options
[--output output] [--auto] [--mode mode] [--preferred] [--pos
xxy] [--rate rate] [--reflect reflection]
[--rotate orientation] [--left-of output] [--right-of output] [--above
output] [--below output] [--same-as out-
put] [--set property value] [--off] [--crtc crtc] [--gamma
red:green:blue] [--brightness brightness]
RandR version 1.0 and version 1.1 options
[-o orientation] [-s size] [-r rate] [-x] [-y]
DESCRIPTION
Xrandr is used to set the size, orientation and/or reflection of the
outputs for a screen. It can also set the
screen size.
If invoked without any option, it will dump the state of the outputs,
showing the existing modes for each of
them, with a '+' after the preferred mode and a '*' after the current
mode.
There are a few global options. Other options modify the last output
that is specified in earlier parameters in
the command line. Multiple outputs may be modified at the same time by
passing multiple --output options fol-
lowed immediately by their corresponding modifying options.
-help Print out a summary of the usage and exit.
-v, --version
Print out the RandR version reported by the X server and exit.
--verbose
Causes xrandr to be more verbose. When used with -q (or without
other options), xrandr will display more
information about the server state. Please note that the gamma
and brightness informations are only
approximations of the complete color profile stored in the
server. When used along with options that
reconfigure the system, progress will be reported while executing
the configuration changes.
-q, --query
When this option is present, or when no configuration changes are
requested, xrandr will display the cur-
rent state of the system.
--dryrun
Performs all the actions specified except that no changes are
made.
--nograb
Apply the modifications without grabbing the screen. It
avoids to block other applications during the
update but it might also cause some applications that detect
screen resize to receive old values.
-d, -display name
This option selects the X display to use. Note this refers to the
X screen abstraction, not the monitor
(or output).
--screen snum
This option selects which screen to manipulate. Note this
refers to the X screen abstraction, not the
monitor (or output).
--q1 Forces the usage of the RandR version 1.1 protocol, even if a
higher version is available.
--q12 Forces the usage of the RandR version 1.2 protocol, even if the
display does not report it as supported
or a higher version is available.
RandR version 1.3 options
Options for RandR 1.3 are used as a superset of the options for RandR
1.2.
--current
Return the current screen configuration, without polling for
hardware changes.
--noprimary
Don't define a primary output.
Per-output options
--panning
widthxheight[+x+y[/track_widthxtrack_height+track_x+track_y[/border_left/border_top/border_right/bor-
der_bottom]]]
This option sets the panning parameters. As soon as panning is
enabled, the CRTC position can change
with every pointer move. The first four parameters specify
the total panning area, the next four the
pointer tracking area (which defaults to the same area). The last
four parameters specify the border and
default to 0. A width or height set to zero disables panning on
the according axis. You typically have to
set the screen size with --fb simultaneously.
--transform a,b,c,d,e,f,g,h,i
Specifies a transformation matrix to apply on the output.
Automatically a bilinear filter is selected.
The mathematical form corresponds to:
a b c
d e f
g h i
The transformation is based on homogeneous coordinates. The
matrix multiplied by the coordinate vector of
a pixel of the output gives the transformed coordinate vector of
a pixel in the graphic buffer. More
precisely, the vector (x y) of the output pixel is extended to 3
values (x y w), with 1 as the w coordi-
nate and multiplied against the matrix. The final device
coordinates of the pixel are then calculated
with the so-called homogenic division by the transformed w
coordinate. In other words, the device coor-
dinates (x' y') of the transformed pixel are:
x' = (ax + by + c) / w' and
y' = (dx + ey + f) / w' ,
with w' = (gx + hy + i) .
Typically, a and e corresponds to the scaling on the X and Y
axes, c and f corresponds to the translation
on those axes, and g, h, and i are respectively 0, 0 and 1. The
matrix can also be used to express more
complex transformations such as keystone correction, or rotation.
For a rotation of an angle T, this
formula can be used:
cos T -sin T 0
sin T cos T 0
0 0 1
As a special argument, instead of passing a matrix, one can
pass the string none, in which case the
default values are used (a unit matrix without filter).
--scale xxy
Changes the dimensions of the output picture. Values superior to
1 will lead to a compressed screen
(screen dimension bigger than the dimension of the output mode),
and values below 1 leads to a zoom in on
the output. This option is actually a shortcut version of the
--transform option.
--primary
Set the output as primary. It will be sorted first in Xinerama
and RANDR geometry requests.
RandR version 1.2 options
These options are only available for X server supporting RandR version
1.2 or newer.
--prop, --properties
This option causes xrandr to display the contents of properties
for each output. --verbose also enables
--prop.
--fb widthxheight
Reconfigures the screen to the specified size. All configured
monitors must fit within this size. When
this option is not provided, xrandr computes the smallest screen
size that will hold the set of config-
ured outputs; this option provides a way to override that
behaviour.
--fbmm widthxheight
Sets the reported values for the physical size of the screen.
Normally, xrandr resets the reported physi-
cal size values to keep the DPI constant. This overrides that
computation.
--dpi dpi
This also sets the reported physical size values of the screen,
it uses the specified DPI value to com-
pute an appropriate physical size using whatever pixel size will
be set.
--newmode name mode
New modelines can be added to the server and then associated
with outputs. This option does the former.
The mode is specified using the ModeLine syntax for xorg.conf:
clock hdisp hsyncstart hsyncend htotal
vdisp vsyncstart vsyncend vtotal flags. flags can be zero or
more of +HSync, -HSync, +VSync, -VSync,
Interlace, DoubleScan, CSync, +CSync, -CSync. Several tools
permit to compute the usual modeline from a
height, width, and refresh rate, for instance you can use cvt.
--rmmode name
This removes a mode from the server if it is otherwise unused.
--addmode output name
Add a mode to the set of valid modes for an output.
--delmode output name
Remove a mode from the set of valid modes for an output.
Per-output options
--output output
Selects an output to reconfigure. Use either the name of the
output or the XID.
--auto For connected but disabled outputs, this will enable them using
their preferred mode (or, something close
to 96dpi if they have no preferred mode). For disconnected but
enabled outputs, this will disable them.
--mode mode
This selects a mode. Use either the name or the XID for mode
--preferred
This selects the same mode as --auto, but it doesn't
automatically enable or disable the output.
--pos xxy
Position the output within the screen using pixel coordinates. In
case reflection or rotation is applied,
the translation is applied after the effects.
--rate rate
This marks a preference for refresh rates close to the specified
value, when multiple modes have the same
name, this will select the one with the nearest refresh rate.
--reflect reflection
Reflection can be one of 'normal' 'x', 'y' or 'xy'. This causes
the output contents to be reflected
across the specified axes.
--rotate rotation
Rotation can be one of 'normal', 'left', 'right' or
'inverted'. This causes the output contents to be
rotated in the specified direction. 'right' specifies a clockwise
rotation of the picture and 'left'
specifies a counter-clockwise rotation.
--left-of, --right-of, --above, --below, --same-as another-output
Use one of these options to position the output relative to the
position of another output. This allows
convenient tiling of outputs within the screen. The position is
always computed relative to the new
position of the other output, so it is not valid to say --output
a --left-of b --output b --left-of a.
--set property value
Sets an output property. Integer properties may be specified as a
valid (see --prop) decimal or hexadeci-
mal (with a leading 0x) value. Atom properties may be set to any
of the valid atoms (see --prop). String
properties may be set to any value.
--off Disables the output.
--crtc crtc
Uses the specified crtc (either as an index in the list of
CRTCs or XID). In normal usage, this option
is not required as xrandr tries to make sensible choices about
which crtc to use with each output. When
that fails for some reason, this option can override the normal
selection.
--gamma red:green:blue
Set the specified floating point values as gamma correction on
the crtc currently attached to this out-
put. Note that you cannot get two different values for cloned
outputs (i.e.: which share the same crtc)
and that switching an output to another crtc doesn't change the
crtc gamma corrections at all.
--brightness brightness
Multiply the gamma values on the crtc currently attached to the
output to specified floating value. Use-
ful for overly bright or overly dim outputs. However, this is a
software only modification, if your
hardware has support to actually change the brightness, you will
probably prefer to use xbacklight.
RandR version 1.1 options
These options are available for X servers supporting RandR version 1.1
or older. They are still valid for newer
X servers, but they don't interact sensibly with version 1.2 options on
the same command line.
-s, --size size-index or --size widthxheight
This sets the screen size, either matching by size or using the
index into the list of available sizes.
-r, --rate, --refresh rate
This sets the refresh rate closest to the specified value.
-o, --orientation rotation
This specifies the orientation of the screen, and can be one of
normal, inverted, left or right.
-x Reflect across the X axis.
-y Reflect across the Y axis.
EXAMPLES
Sets an output called LVDS to its preferred mode, and on its right put
an output called VGA to preferred mode of
a screen which has been physically rotated clockwise:
xrandr --output LVDS --auto --rotate normal --pos 0x0 --output
VGA --auto --rotate left --right-of LVDS
Forces to use a 1024x768 mode on an output called VGA:
xrandr --newmode "1024x768" 63.50 1024 1072 1176 1328 768 771
775 798 -hsync +vsync
xrandr --addmode VGA 1024x768
xrandr --output VGA --mode 1024x768
Enables panning on a 1600x768 desktop while displaying 1024x768 mode on
an output called VGA:
xrandr --fb 1600x768 --output VGA --mode 1024x768 --panning 1600x0
Have one small 1280x800 LVDS screen showing a small version of a
huge 3200x2000 desktop, and have a big VGA
screen display the surrounding of the mouse at normal size.
xrandr --fb 3200x2000 --output LVDS --scale 2.5x2.5
--output VGA --pos 0x0 --panning
3200x2000+0+0/3200x2000+0+0/64/64/64/64
Displays the VGA output in trapezoid shape so that it is keystone
corrected when the projector is slightly above
the screen:
xrandr --fb 1024x768 --output VGA --transform
1.24,0.16,-124,0,1.24,0,0,0.000316,1
SEE ALSO
Xrandr(3), cvt(1), xkeystone(1), xbacklight(1)
AUTHORS
Keith Packard, Open Source Technology Center, Intel Corporation. and
Jim Gettys, Cambridge Research Laboratory,
HP Labs, HP.
X Version 11 xrandr 1.3.5
XRANDR(1)
Olav Kvittem wrote on 07/20/2018 12:34 PM:
> Hi,
>
> When I connect a projector I would like full-screen mode in for example
> Libreoffice and Shotwell
>
> to go to the projector not to the laptop display.
>
> (How) can I do that ?
>
>
> I have tried to move the application to the projector screen before
> maximizing,
>
> but the image ends up on the primary screen.
>
>
> Best regards
>
> Olav Kvittem
>
>
