refactor!: restructure and document configuration

shared/home-manager/dotfiles/gamemode.ini

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+[general]
+; The reaper thread will check every 5 seconds for exited clients, for config file changes, and for the CPU/iGPU power balance
+reaper_freq=5
+
+; The desired governor is used when entering GameMode instead of "performance"
+desiredgov=performance
+; The default governor is used when leaving GameMode instead of restoring the original value
+;defaultgov=powersave
+
+; GameMode can change the scheduler policy to SCHED_ISO on kernels which support it (currently
+; not supported by upstream kernels). Can be set to "auto", "on" or "off". "auto" will enable
+; with 4 or more CPU cores. "on" will always enable. Defaults to "off".
+softrealtime=off
+
+; GameMode can renice game processes. You can put any value between 0 and 20 here, the value
+; will be negated and applied as a nice value (0 means no change). Defaults to 0.
+renice=0
+
+; By default, GameMode adjusts the iopriority of clients to BE/0, you can put any value
+; between 0 and 7 here (with 0 being highest priority), or one of the special values
+; "off" (to disable) or "reset" (to restore Linux default behavior based on CPU priority),
+; currently, only the best-effort class is supported thus you cannot set it here
+ioprio=reset
+
+; Sets whether gamemode will inhibit the screensaver when active
+; Defaults to 1
+inhibit_screensaver=0
+
+[filter]
+; If "whitelist" entry has a value(s)
+; gamemode will reject anything not in the whitelist
+;whitelist=RiseOfTheTombRaider
+
+; Gamemode will always reject anything in the blacklist
+;blacklist=HalfLife3
+;    glxgears
+
+[gpu]
+; Here Be Dragons!
+; Warning: Use these settings at your own risk
+; Any damage to hardware incurred due to this feature is your responsibility and yours alone
+; It is also highly recommended you try these settings out first manually to find the sweet spots
+
+; Setting this to the keyphrase "accept-responsibility" will allow gamemode to apply GPU optimisations such as overclocks
+;apply_gpu_optimisations=accept-responsibility
+
+; The DRM device number on the system (usually 0), ie. the number in /sys/class/drm/card0/
+;gpu_device=1
+
+; AMD specific settings
+; Requires a relatively up to date AMDGPU kernel module
+; See: https://dri.freedesktop.org/docs/drm/gpu/amdgpu.html#gpu-power-thermal-controls-and-monitoring
+; It is also highly recommended you use lm-sensors (or other available tools) to verify card temperatures
+; This corresponds to power_dpm_force_performance_level, "manual" is not supported for now
+;amd_performance_level=auto
+
+[supervisor]
+; This section controls the new gamemode functions gamemode_request_start_for and gamemode_request_end_for
+; The whilelist and blacklist control which supervisor programs are allowed to make the above requests
+;supervisor_whitelist=
+;supervisor_blacklist=
+
+; In case you want to allow a supervisor to take full control of gamemode, this option can be set
+; This will only allow gamemode clients to be registered by using the above functions by a supervisor client
+;require_supervisor=0
+
+[custom]
+; Custom scripts (executed using the shell) when gamemode starts and ends
+;start=notify-send "GameMode started"
+;    /home/me/bin/stop_ethmining.sh
+
+;end=notify-send "GameMode ended"
+;    /home/me/bin/start_ethmining.sh
+
+; Timeout for scripts (seconds). Scripts will be killed if they do not complete within this time.
+;script_timeout=10