It looks like https://bugzilla.redhat.com/show_bug.cgi?id=1150384. Note that the bug required systemd *and* dracut to be fixed.

The dracut patch is in rhel since 7.1.

This seems to be working now. Just set (for el_GR) 
FONT="iso07u-16" in /etc/vconsole.conf

For QE I am not sure if this was broken before rebase, but it will be good to have a test for it.

(In reply to Lukáš Nykrýn from comment #4)
> This seems to be working now. Just set (for el_GR) 
> FONT="iso07u-16" in /etc/vconsole.conf
> 
> For QE I am not sure if this was broken before rebase, but it will be good
> to have a test for it.

I've tried it out on the RHEL-7.2-20150625.n.0 nightly, which has systemd 219-4. Right after installation I would still get the white rectangles in the Greek and Japanese locales. After changing the font to iso07u-16 in /etc/vconsole.conf and rebooting Greek seems to be working but Japanese is still busted:
https://m4rtink.fedorapeople.org/anaconda/screenshots/non-latin_console/console_non-latin_june29.png

Also if I understand it correctly, this fix does not address the fact that without changing the default console font non-latin characters will still be displayed as rectangles ?

This bug has been motivated by bug 1182562 - Anaconda & Initial Setup TUI showing as rectangles when the user selects a language with non-latin characters. It currently looks like this,
for Greek:
https://m4rtink.fedorapeople.org/anaconda/screenshots/non-latin_console/anaconda_tui_greek_june29.png

And for Japanese:
https://m4rtink.fedorapeople.org/anaconda/screenshots/non-latin_console/anaconda_tui_japanese_june29.png

Do I understand it correctly we would need to change the console font at runtime (and somehow map language codes to the proper console font name) to make it show up correctly ? Or is there some "universal" font or other mechanism that could do that (show proper characters instead of rectangles based on locale) automatically ?

(In reply to Martin Kolman from comment #7)
> Also if I understand it correctly, this fix does not address the fact that
> without changing the default console font non-latin characters will still be
> displayed as rectangles ?

How is the text supposed to be displayed correctly if the font is wrong? Merely changing the locale setting is not enough (in case of Greek or Japanese, that is).

> Do I understand it correctly we would need to change the console font at
> runtime (and somehow map language codes to the proper console font name) to
> make it show up correctly ?

Yes.

> Or is there some "universal" font or other
> mechanism that could do that (show proper characters instead of rectangles
> based on locale) automatically ?

AFAIK systemd uses it's own algorithm to approximate this.

Some notes here:

1) There is no 'universal' console font. AFAIK there's a limited number of characters you can include in any console font, and it's not enough to cover all scripts.

2) EL 7's default console font is still, I believe, latarcyrheb-sun16 . 'latarcyrheb' is a contract of 'latin arabic cyrillic hebrew' - i.e. those are the scripts it can render. Note that neither 'greek' nor 'japanese' is in that list. Fedora changed its default console font to 'eurlatgr' - 'european-latin-greek' - in F22: see https://fedoraproject.org/wiki/Changes/NewDefaultConsoleFont . That provides better coverage for European languages and includes Greek, but sacrifices Cyrillic, Arabic and Hebrew rendering.

3) systemd-vconsole-setup takes care of loading the 'default' console font during boot. The 'default' font is actually just what's listed in /etc/vconsole.conf : if that file contains a FONT= line, systemd-vconsole-setup will load it. It also looks for a 'vconsole.font' kernel parameter. If neither of those things is set, systemd-vconsole-setup will not load any font, and the console font provided by the system firmware will still be used.

Up till recently Fedora had a bug whereby there was no /etc/vconsole.conf in the anaconda environment, so the 'default' console font was not actually being loaded. Looking at EL 7, I believe it has the same bug: there is no /etc/vconsole.conf file, and Cyrillic characters are rendered as white boxes, even though latarcyrheb should be able to display them. As well as the fix from #1182562 , I think EL 7's lorax should be fixed to include /etc/vconsole.conf in the installer environment, as we did for Fedora 23: https://bugzilla.redhat.com/show_bug.cgi?id=1250260

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2092.html