Comment # 15 on bug 1183234 from Dr. Werner Fink

(In reply to Guillaume GARDET from comment #14)
> (In reply to Dr. Werner Fink from comment #12)
> > Still I do not know what console font is used!
> 
> How to check this?
> I can update the openQA test to collect required data on failure, if you
> tell me exactly what and how to do it.

The values set /etc/sysconfig/console like CONSOLE_FONT,
CONSOLE_MAGIC, CONSOLE_ENCODING,

The value TERM on the console (should be linux and not old cons25 or similar)

Please be aware that the nurses API use a escape sequence to switch
line graphics mode on and off of the used console font.  If you are using the
option --ascii-lines ... like

  dialog --ascii-lines --yesno yesno 5 30

then the real characters are shown as it are defined and shown in
man:terminfo(5) at section `Line Graphics` at the table in column
`Ascii Default` ... and as this works with the ACS characters

  acsc=++\,\,--..00``aaffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{||}}~~,

in new TERM=linux as I've seen on the console it is very likly that this
is not an error of ncurses.

> 
> (In reply to Dr. Werner Fink from comment #13)
> > Also what kind of hardware/platform is missed ... is this ARM/ARM64?
> 
> This happens in qemu VM for both x86_64 and aarch64.

Hmmm ... it could be a problem with qemu and its EGA/VGA console emulation
and it  this happens randomly this smells like not initialized start values
for the font character mapping