I'm using Arch Linux (kernel 3.17.6-1-ARCH).
When printing, the vertical spacing between lines appears to be too tight; the descenders of lower case letters are cut off and underscores don't print at all. The only line that prints correctly is the last line before a page break.
I'm using the standard Monospace 10 font.
(not that it will help, but printing code is known to have many issues currently, and no clear fixes ahead…)