Qbix wrote: dosbox will probably attempt to set 640x480x70 when in fullscreen. Thanks. This inspired me to make some changes to my xorg.conf, which seems to have cured the problem.

It seems that Nvidia proprietary drivers and Dosbox don't mix. No configuration combination seems to be able to provide me with the desired scaling result. I would simply like to have the output scaled on my full screen, preferably without any filters. All I get is a small, postal-stamp-sized image …