LaTeX3 Error: Backend request inconsistent with engine: using 'pdfmode'

[Guenter Milde]

On 2020-02-22, Kornel Benko wrote:

> [-- Type: text/plain, Encoding: quoted-printable --]

> Am Sat, 22 Feb 2020 19:04:48 -0000 (UTC)
> schrieb Guenter Milde <milde at users.sf.net>:
>> On 2020-02-22, Kornel Benko wrote:
>> > Am Sat, 22 Feb 2020 09:44:21 -0000 (UTC)
>> > schrieb Guenter Milde <milde at users.sf.net>:  
>> >> On 2020-02-20, Scott Kostyshak wrote:  
>> >> > On Mon, Feb 03, 2020 at 04:44:07PM +0100, Kornel Benko wrote:    
>> >> >> Am Mon, 3 Feb 2020 10:42:06 -0500
>> >> >> schrieb Scott Kostyshak <skostysh at lyx.org>:    
>> >> >> > On Mon, Feb 03, 2020 at 04:29:34PM +0100, Kornel Benko wrote:    

>> >> ...  

>> >> > I tested on an updated TL. Removing the custom class option dvips fixes
>> >> > it. However, I'm not sure this is the right thing to do. In the inverted
>> >> > tests, we have the following:    

>> >> >   # Comment by Jürgen Spitzmüller
>> >> >   # The document requests the dvips graphics driver,
>> >> >   # and of course this fails with any other backend.
>> >> >   #
>> >> >   # The document compiles if one sets the graphics driver to "Automatic"
>> >> >   # and remove the dvips class option. But then, the output is not correct
>> >> >   # (rotation of foils does not work).
>> >> >   export/examples/(|fr/)Presentations/Foils_pdf[45]_systemF    

>> >> > The output does not seem to change with or without the option for pdf2
>> >> > format, but the above comment suggests it does for other formats.    

>> >> Could you please test export to Postscript or PDF (ps2pdf) and check the
>> >> orientation of rotated pages in the output?  


>> > No visible differences.
>> > 'diffpdf' finds some, but only some glyphs are there, see attached.  

>> If it is/looks right with "auto" now, then it should be save to change from
>> "dvips" to "auto" and remove the clause and comment from "invertedTests".

>> Günter


> Looks OK for examples/Presentations/Foils.lyx
> but not for  examples/fr/Presentations/Foils.lyx
> PDF (xetex) (system fonts) OK
> PDF (luatex) (system fonts) OK
> PDF (luatex) (tex fonts) gives following error
> 	...
> 	LaTeX Font Info:    Checking defaults for U/cmr/m/n on input line 43.
> 	LaTeX Font Info:    ... okay on input line 43.
> 	LaTeX Info: Redefining \dots on input line 43.
> 	LaTeX Info: Redefining \up on input line 43.
> 	LaTeX Font Info:    Font shape `T1/fcmss/b/n' in size <29.86> not available
> 	(Font)              Font shape `T1/fcmss/bx/n' tried instead on input line 49.
> 	! error:  (linebreak): invalid list tail, probably missing glue
> 	!  ==> Fatal error occurred, no output PDF file produced!

This looks to me like a different problem. We should invert or ignore the
"LuaTeX with tex fonts" export (Foils is a rather old package and LuaTeX
with 8-bit fonts is not supported by many packages and also seldom used.)

How about PDF (pdflatex)?

Günter