粗体模模糊糊的怎么办？

neptune

gentoo升级到了xorg-x11-7.0.1, fontconfig-2.3.2, freetype-2.1.10
sans 粗体模糊，笔画密的会密得粘在一起,常规字体也发虚，怎么办？

我没有打任何补丁, /etc/fonts/local.conf主要部分如下 ：
[code:1]
<match target="font">

        <test name="family" qual="any">
<string>Tahoma</string>
<string>Verdana</string>
<string>Arial</string>
<string>Times</string>
<string>Times New Roman</string>
<string>Courier</string>
<string>Courier New</string>
<string>SimSun</string>
<string>MingLiU</string>
</test>

        <!--
                <edit mode="assign" name="antialias" >
                        <bool>true</bool>
                </edit>
                <edit mode="assign" name="hint">
                        <bool>true</bool>
                </edit>
                <edit mode="assign" name="autohint">
                        <bool>false</bool>
                </edit>
               
-->
</match>

        <match target="font">

        <edit name="spacing">
<const>proportional</const>
</edit>

        <edit name="globaladvance">
<bool>false</bool>
</edit>
</match>

        <match target="pattern">

        <test name="family">
<string>Tahoma</string>
</test>

        <edit name="family" mode="append" binding="strong">
<string>SimSun</string>
</edit>
</match>
[/code:1]

/etc/fonts/fonts.conf里面有这样一段话,是默认有的,是否这就是实现粗体的关键？
[code:1]
<!--

Synthetic emboldening for fonts that do not have bold face available

-->

        <match target="font">
<!-- check to see if the font is just regular -->

        <test name="weight" compare="less_eq">
<int>100</int>
</test>
<!-- check to see if the pattern requests bold -->

        <test target="pattern" name="weight" compare="more_eq">
<int>200</int>
</test>
<!-- set the embolden flag -->

        <edit name="embolden" mode="assign">
<bool>true</bool>
</edit>
</match>
[/code:1]