Comment # 9 on bug 1118557 from Ulrich Windl

Some more mysteries:
* I can convert a DVI file to PNG using dvipng without a problem.

* Listing the fonts (xdvi -l) of one problematic files shows:
xdvi: cmti10 at 657 dpi
xdvi: cmbx10 at 657 dpi
xdvi: cmbx12 at 720 dpi
xdvi: cmr12 at 720 dpi
xdvi: cmr8 at 600 dpi
xdvi: cmr12 at 600 dpi
xdvi: cmr10 at 657 dpi
xdvi: cmr7 at 600 dpi
Warning: Missing charsets in String to FontSet conversion
Warning: Unable to load any usable fontset
Error: Aborting: no fontset found

However, the display resolution reported by xdpyinfo is 96 DPI.  Could it be
that xdvi mis-calculates the font resolution?

dvitype reports this:
This is DVItype, Version 3.6 (TeX Live 2017/TeX Live for SUSE Linux)
Options selected:
  Starting page = * 
  Maximum number of pages = 1000000
  Output level = 4 (the works)
  Resolution = 300.00000000 pixels per inch
numerator/denominator=25400000/473628672
magnification=1000;       0.00006334 pixels per DVI unit
' TeX output 2018.12.05:2252'
Postamble starts at byte 2911.
maxv=48071446, maxh=30767216, maxstackdepth=9, totalpages=1
Font 20: cmti10 scaled 1095---loaded at size 717619 DVI units 
 (this font is magnified 109%) 
Font 19: cmbx10 scaled 1095---loaded at size 717619 DVI units 
 (this font is magnified 109%) 
Font 18: cmbx12 scaled 1200---loaded at size 943718 DVI units 
 (this font is magnified 120%) 
Font 17: cmr12 scaled 1200---loaded at size 943718 DVI units 
 (this font is magnified 120%) 
Font 16: cmr8---loaded at size 524288 DVI units 
Font 15: cmr12---loaded at size 786432 DVI units 
Font 14: cmr10 scaled 1095---loaded at size 717619 DVI units 
 (this font is magnified 109%) 
Font 6: cmr7---loaded at size 458752 DVI units 

42: beginning of page 1 
[...]

dvipdf can convert the DVI to PDF also without any complaint.