For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:RN:supergfxctl/openSUSE_Tumbleweed/home:RN:supergfxctl.repo
zypper refresh
zypper install supergfxctl
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:RN:supergfxctl/openSUSE_Slowroll/home:RN:supergfxctl.repo
zypper refresh
zypper install supergfxctl
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:RN:supergfxctl/15.6/home:RN:supergfxctl.repo
zypper refresh
zypper install supergfxctl