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trying to split a big monitor into 3 with xrandr

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user1130176

i have a large monitor, 3840x1080, that i want to split into 3 monitors, each 1/3:

xrandr
...
XWAYLAND1 connected 3840x1080+1920+0 (normal left inverted right x axis y axis) 1190mm x 340mm

After trying many things, I think I need to issue these 3 commands to split it into 3:

xrandr --setmonitor XWAYLAND1~1 1280/0x1080/0+0+0 XWAYLAND1
xrandr --setmonitor XWAYLAND1~2 1280/0x1080/0+1280+0 none
xrandr --setmonitor XWAYLAND1~3 1280/0x1080/0+2560+0 none

Those seem to be accepted:

xrandr --setmonitor XWAYLAND1~1 1280/0x1080/0+0+0 XWAYLAND1

output:

output list XWAYLAND1
add monitor XWAYLAND1
output name XWAYLAND1


xrandr --setmonitor XWAYLAND1~2 1280/0x1080/0+1280+0 none
xrandr --setmonitor XWAYLAND1~3 1280/0x1080/0+2560+0 none

no output for the above 2 commands.

After entering these commands, nothing happens, so my understanding is I am supposed to run xrandr --fb so I try

xrandr --fb 1920x1080

And I get

xrandr: specified screen 1920x1080 not large enough for output XWAYLAND1 (3840x1080+1920+0)
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  139 (RANDR)
  Minor opcode of failed request:  7 (RRSetScreenSize)
  Serial number of failed request:  29
  Current serial number in output stream:  30

Am I doing something wrong in either the initial set of commands or the fb command?

Thanks for any help, Kevin

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