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higher resolution for low-res displays / extended?
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heikkikk
Tux's lil' helper
Tux's lil' helper


Joined: 05 Feb 2008
Posts: 97

PostPosted: Tue Dec 03, 2019 4:15 am    Post subject: higher resolution for low-res displays / extended? Reply with quote

Hello.
Is it somehow possible to have like a "virtual resolution" or something like...
because my display resolution is a bit low for some apps, is it possible to have it higher than the display pixel amount so that when i move the mouse, the display contents move also?
i have 1366x768 pixels and if i could have like 1920 x 1080 virtual desktop and it shows the 1366x768 of it?

kind of difficult to explain what i want, but i have seen this about 15 years ago on some Linux distribution...

moving the mouse shows me more :)

BTW, i have Gnome, if it helps on answering

edit: I might also switch to another window manager if it helps :)
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Ant P.
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Joined: 18 Apr 2009
Posts: 6129

PostPosted: Tue Dec 03, 2019 5:44 am    Post subject: Reply with quote

Code:
xrandr --fb 1920x1080 --output (foo) --mode 1366x768 --panning 1920x1080
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 44476
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PostPosted: Tue Dec 03, 2019 1:30 pm    Post subject: Reply with quote

heikkikk,

Yes. The feature is called a virtual display.
The physical display is a 'viewport' into the virtual display and moves as you approach the edge of the 'viewport'.
Ant P. has described one way to achieve it.

You can set it in xorg.conf too.

Code:
Section "Screen"
    Identifier  "Screen 1"
    Device "RX 460"

   Monitor     "Samsung"
    DefaultDepth 24

    Subsection "Display"
       Depth       24
        Modes      "2560x1440" "1600x1200" "1280x1024" "1280x800@60" "1024x768" "800x600" "640x480"
#       Virtual  xdim ydim
        Virtual 3840 2160       # Pretend a 3840x2160  display.
        ViewPort    0 0
    EndSubsection
EndSection


The
Code:
ViewPort    0 0
is the position of the ViewPort top left corner when Xorg starts.
0 0 being the top left of the Virtual display.

Your grahics card needs to support the Virtual resolution as it will draw the entire image in the pixel buffer.
I've not used this feature for a long time but my xorg.conf goes back to 1999. :)
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NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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heikkikk
Tux's lil' helper
Tux's lil' helper


Joined: 05 Feb 2008
Posts: 97

PostPosted: Tue Dec 03, 2019 6:18 pm    Post subject: Reply with quote

Ant P. wrote:
Code:
xrandr --fb 1920x1080 --output (foo) --mode 1366x768 --panning 1920x1080


Works, somehow...

if i have nothing on the "outside" area, it is not refreshing well there....

https://www.dropbox.com/s/6hmihm5t3xtv9av/VID_20191203_130914.mp4?dl=0
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Ant P.
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Joined: 18 Apr 2009
Posts: 6129

PostPosted: Wed Dec 04, 2019 6:33 am    Post subject: Reply with quote

I've noticed the same in testing it - dragging windows to a panning monitor has very poor framerate. Maybe this feature is underdeveloped.
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