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0f7b58d
(Get the code!)
This is interesting:
> Impossible to set scaling on crtc 59 to 1.000000, error id 2
Error 2 is BadValue and I can reproduce similar on the command line:
$ xrandr --output VNC-output-0 --scale 1x1 # or 2x2, 0.5x0.5
This works in Xorg but seems to always fail in Xdcv with error BadValue (2). And the same with:
$ xrandr --output VNC-output-0 --filter nearest # or bilinear
Works in Xorg but not in Xdcv.
So fractional scaling failing is expected on Xdcv, but I don't think those functions are historically needed for integer scaling. Only our fractional scaling patch tries to use them unconditionally for integer scaling. So that's both a unique failure to the fractional scaling patch and also not its fault -- failing to change the scaling matrix is a failure on the Xdcv side.
In summary we should probably only be trying to fix the fractional scaling OFF case here. Because that's probably the only mode that Xdcv can handle in theory.