I'm facing this issue in the latest kernel mainline, too.
CPU is an Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz (which uses i915 graphics).
The graphic glitches were gone after some kernel update but the error messages
in dmesg remained.
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This is still persistent in 16.10 using a Kyocera network printer (that
is PostScript and PDF capable).
however if the png-pdf is printed using lpr everything is fine.
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Public bug reported:
xdypinfo reports wrong screen dimensions and resolution (always 96x96
dpi).
$ xdpyinfo | grep -B2 resolution
screen #0:
dimensions:3840x2160 pixels (1016x571 millimeters)
resolution:96x96 dots per inch
However, xrandr reports the right dimensions:
$ xrandr
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