Comment 11 for bug 305394

(In reply to comment #10)
> Created an attachment (id=341895) [details]
> log file
>
> > fc-match -v sans-serif:bold:pixelsize=13.3:rgba=1 | grep rgba
>
> rgba: 5(i)(w)

Thank you. The problem is the same as reported here:

https://bugs.freedesktop.org/show_bug.cgi?id=17722

 "Add Subst match
  edit
          Edit rgba Assign none;"

A fontconfig setting is unconditionally disabling rgba antialiasing.
i.e. setting subpixel geometry to "none".

Do you have a link or file /etc/fonts/conf.d/10-no-sub-pixel.conf ?
This is not normally installed in an active directory but usually only exists
in /etc/fonts/conf.avail, in fontconfig versions that I've seen anyway.

If you don't have that file try

  grep -l rgba /etc/fonts/* /etc/fonts/conf.d/* ~/.fonts.conf

to find the file that has this setting.

If the file is in /etc/:

  Do you know if this file was installed by default?

  What distibution are you using?

  What fontconfig version? "pkg-config fontconfig --modversion" if you have
  dev packages installed, or better the distribution's fontconfig package
  version number.

If it is in ~/.fonts.conf

  Have you run a KDE session and set fonts from there?