I'm seeing the issue with 1.5~git20190812-107d469-1.
I don't see a package in Experimental, for what it's worth. sudo apt-get -t experimental install gamemode Reading package lists... Done Building dependency tree Reading state information... Done gamemode is already the newest version (1.5~git20190812-107d469-1). That said, what I do see is this error message in syslog: gamemoded[27352]: Error accessing /usr/libexec/cpugovctl: No such file or directory libgamemode0 has the cpugovctl and gpuclockctl commands in /usr/bin. The gamemoded binary has hardcoded paths to cpugovctl and gpuclockctl. $ strings `which gamemoded` | grep -E '(cpugovctl|gpuclockctl)' /usr/libexec/cpugovctl /usr/libexec/cpugovctl ... <snip> ... /usr/libexec/gpuclockctl Placing cpugovctl and gpuclockctl in the PATH won't help (they're already in /usr/bin!) -- they have to match where the binary is hardcoded to expect them. Either the packaging needs to change to put the binaries in /usr/libexec, or the build needs to change the libexec path to /usr/bin. I'm less familiar with using meson to do builds, so I'd guess it'd be something like adding "--libexecdir /usr/bin" to the 'meson build' command.
