I notice that this thread ends without a solution. I have the same problem with my Mayo 15 xfce version. The fonts for icons, menus, search bars and more, etc are too small to read. Anything else, like text through browers is fine. Full resolution, 1600x900 is the only way to fill the screen of my big screen tv. A smaller resolution works fine though for proportional viewing of these fonts but it fills a small portion of my screen. Also, I am connected through the pc monitor port and not the hdmi one as my computer is older. When I start my computer, the tv gives me the message "non-recommended signal - check output" or something very close to that. Generally , the display is awesome and movie files play extremely well - it's just the font issue which makes navigating around the menu and reading files within Thunar impossible. Thanks in advance.