For what its' worth, xrandr is broken if you have xcinerama enabled, atleast with the Nvidia drivers.
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On Fri, 26 Jun 2015, Milan Kníek wrote:
Date: Fri, 26 Jun 2015 15:27:26 +0200 From: "Milan [UTF-8] Kníek" <knizek.confy@gmail.com> To: Robert Dinse <nanook@eskimo.com> Cc: Simon Baev <simonbaev@gmail.com>, x2go-user <x2go-user@lists.x2go.org> Subject: Re: [X2Go-User] x2goserver on Ubuntu Mate 15.04 with 4k monitor and high font-rendering DPI
Robert Dinse píÿÿe v Pá 26. 06. 2015 v 05:32 -0700:
In Mate, if you go into System->Preferences->Look and Feel->Appearance, then select the "Fonts" tab, in the lower right click on "Details", then in the upper left you can set the resolution to whatever DPI you want. This works with X2Go, NX protocol with Remmina, and pretty much everything else I've tried.
It surely does, because it is the same as the command: gsettings set org.mate.font-rendering dpi XX
Using GUI is great for a once-set-do-not-touch-anymore action, but when you need to change the DPI often...
Anyway, the aim is to use DPI settings as per x2go client setup. It seems that in MATE, once the user sets hiw own value, the DPI from xorg.conf is ignored (which sounds logical but does not fit the bill for our use). xrandr --dpi XX in the running x2go session also does not have any effect.
Milan