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

[Guenter Milde]

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