The following will fix Calibri by disabling the use of the embedded bitmaps via fontconfig:
$ cd /etc/fonts/
$ cat conf.avail/75-fix-calibri.conf
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<!-- Use embedded bitmaps in fonts like Calibri? -->
<match target="font" >
<edit name="embeddedbitmap" mode="assign">
<bool>false</bool>
</edit>
</match>
</fontconfig>
$ ln -s conf.avail/75-fix-calibri.conf conf.d/75-fix-calibri.conf
$ ls -l conf.d/75-fix-calibri.conf
lrwxrwxrwx 1 root root 41 21. Nov 10:19 conf.d/75-fix-calibri.conf -> /etc/fonts/conf.avail/75-fix-calibri.conf
You don't actually need to restart X, for this to go into effect as the applications that use freetype2 and indirectly fontconfig only need to be restarted.
Note that restarting X closes all open windows. I tend to restart X with Alt-Control-Backspace. But pkill X
also works.
Source: bbs.archlinux.org
Tested by OP. Works. See image #3 on initial post.