iMac G5 lubuntu 16.? screen resolution

Hi,
I know that version 16 is not officially supported anymore.
But to my knowledge there is no current version that runs on an iMac G5 anyways, right?

My problem is as follows:
I am trying to reduce the screen resolution (to make old arcade emulators like vice) work properly in fullscreen mode. hardware scaling does not work unfortunately.
I am trying to use xrandr with parameters generated from “cvt 800 600 60”, but it only creates a distored, tile-like picture.
Does anyone have an idea or experience with that and can give me a hint?
thx
unkownstuntman

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