Linux puskom-ProLiant-DL385-Gen10 5.4.0-150-generic #167~18.04.1-Ubuntu SMP Wed May 24 00:51:42 UTC 2023 x86_64

//etc/fonts/conf.d/89-tlwg-laksaman-synthetic.conf

 <?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
	<!-- Synthesize TH Sarabun with scaled-down Laksaman -->
	<match target="pattern">
		<test qual="any" name="family" compare="contains">
			<string>TH Sarabun</string>
		</test>
		<edit name="family" mode="append" binding="same">
			<string>Laksaman</string>
		</edit>
	</match>
	<match target="font">
		<test name="family" compare="eq">
			<string>Laksaman</string>
		</test>
		<test target="pattern" qual="any" name="family" compare="contains">
			<string>TH Sarabun</string>
		</test>
		<edit name="matrix" mode="assign">
			<matrix>
				<double>0.66</double><double>0</double>
				<double>0</double><double>0.66</double>
			</matrix>
		</edit>
	</match>
</fontconfig>