[syslinux] menu.c32 background problem

[Ady Ady]

> Note, I am using syslinux from Ubuntu 16.04.2, presume that is 6.03.
> 
> Regards,
> Barry
 
Before investing time in replying to each different (unexpected) 
behavior, I would suggest testing with *pre-built* binaries from 
6.04-pre1 downloaded from kernel.org (considering the lack of package 
maintenance).

Reminder: *all* (used) syslinux-related binaries pertaining to the 
relevant platform (e.g. BIOS) shall match the same version and build 
(and platform). For instance, if you want to test 6.04-pre1 pre-built 
binaries, you need to use matching lib*.c32 library module files, 
ldlinux.*, menu.c32 (among other used c32 modules), executing the 
matching installer executable, etc, (all originated from the same 
".bios/*" directory tree of the official distribution archives).

After reporting back the resulting behavior with the pre-built 
binaries, we'll see which issues actually remain relevant.

@Barry, would you be able to perform such test?

Regards,
Ady.

PS:
[off topic]
@Barry,
FWIW, in
 barryk.org/quirky/uefi.htm 

CSM != Compatibility Support Mode
CSM  = Compatibility Support Module

[/off topic]