I believe this is different from bug #753220.

With Xft.dpi at 276 (actual resolution) and using xrandr to scale 1.5x1.5, a typical A4 PDF's zoom level is soft capped at about 320%. I say "soft" because it turns out if I zoom in and out fast enough (by holding down Ctrl and moving two fingers on the touchpad) I can get somewhat higher zoom levels, up to 383% with a quick test. However, at the default max of 320% the displayed file is still somewhat smaller than the paper when printed. At 383% it's about the same size as printed. With an A2 (420 × 594 mm) single-page PDF the zoom level is capped at about 160%. This means the page doesn't even fill the whole screen in fullscreen mode, and the contents are completely illegible. The caps on the zoom levels should therefore be changed to be *much* higher than they currently are.

Ideally zoom level 100% (without xrandr scaling) should always make the document display as big as it would be in physical form, and zooming should be capped at maybe two orders of magnitude outside that (1%-10000%).