* xfce 설치

기본 repository 에는 xfce가 없으므로.. 

yum install epel-release 

yum groupinstall xfce

* 스크린세이버

http://repo.openfusion.net/centos7-x86_64/

xscreensaver-5.29-1.of.el7.x86_64.rpm

xscreensaver-base-5.29-1.of.el7.x86_64.rpm

xscreensaver-common-5.29-1.of.el7.x86_64.rpm

xscreensaver-gl-5.29-1.of.el7.x86_64.rpm

* 볼륨조절

https://copr.fedoraproject.org/coprs/nonamedotc/xfce410_epel7_2/build/22018/

http://copr-be.cloud.fedoraproject.org/results/nonamedotc/xfce410_epel7_2/

여기에서

xfce4-mixer-4.10.0-6.el7.x86_64.rpm

xfce4-mixer-debuginfo-4.10.0-6.el7.x86_64.rpm

파일 다운로드

yum install  unique

rpm -Uvh xfce4-mixer*