First Commit

usr/lib/udev/rules.d/20-audio-pm.rules

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+# Disables power saving capabilities for snd-hda-intel when device is not
+# running on battery power. This is needed because it prevents audio cracks on
+# some hardware.
+ACTION=="add", SUBSYSTEM=="sound", KERNEL=="card*", DRIVERS=="snd_hda_intel", TEST!="/run/udev/snd-hda-intel-powersave", \
+    RUN+="/usr/bin/bash -c 'touch /run/udev/snd-hda-intel-powersave; \
+        [[ $$(cat /sys/class/power_supply/BAT0/status 2>/dev/null) != \"Discharging\" ]] && \
+        echo $$(cat /sys/module/snd_hda_intel/parameters/power_save) > /run/udev/snd-hda-intel-powersave && \
+        echo 0 > /sys/module/snd_hda_intel/parameters/power_save'"
+
+SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_ONLINE}=="0", TEST=="/sys/module/snd_hda_intel", \
+    RUN+="/usr/bin/bash -c 'echo $$(cat /run/udev/snd-hda-intel-powersave 2>/dev/null || \
+        echo 10) > /sys/module/snd_hda_intel/parameters/power_save'"
+
+SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_ONLINE}=="1", TEST=="/sys/module/snd_hda_intel", \
+    RUN+="/usr/bin/bash -c '[[ $$(cat /sys/module/snd_hda_intel/parameters/power_save) != 0 ]] && \
+        echo $$(cat /sys/module/snd_hda_intel/parameters/power_save) > /run/udev/snd-hda-intel-powersave; \
+        echo 0 > /sys/module/snd_hda_intel/parameters/power_save'"

usr/lib/udev/rules.d/30-zram.rules

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+# When used with ZRAM, it is better to prefer page out only anonymous pages,
+# because it ensures that they do not go out of memory, but will be just
+# compressed. If we do frequent flushing of file pages, that increases the
+# percentage of page cache misses, which in the long term gives additional
+# cycles to re-read the same data from disk that was previously in page cache.
+# This is the reason why it is recommended to use high values from 100 to keep
+# the page cache as hermetic as possible, because otherwise it is "expensive"
+# to read data from disk again. At the same time, uncompressing pages from ZRAM
+# is not as expensive and is usually very fast on modern CPUs.
+#
+# Also it's better to disable Zswap, as this may prevent ZRAM from working
+# properly or keeping a proper count of compressed pages via zramctl.
+ACTION=="change", KERNEL=="zram0", ATTR{initstate}=="1", SYSCTL{vm.swappiness}="150", \
+    RUN+="/bin/sh -c 'echo N > /sys/module/zswap/parameters/enabled'"

usr/lib/udev/rules.d/40-hpet-permissions.rules

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+KERNEL=="rtc0", GROUP="audio"
+KERNEL=="hpet", GROUP="audio"

usr/lib/udev/rules.d/50-sata.rules

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+# SATA Active Link Power Management
+ACTION=="add", SUBSYSTEM=="scsi_host", KERNEL=="host*", \
+    ATTR{link_power_management_policy}=="*", \
+    ATTR{link_power_management_policy}="max_performance"

usr/lib/udev/rules.d/60-ioschedulers.rules

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+# HDD
+ACTION=="add|change", KERNEL=="sd[a-z]*", ATTR{queue/rotational}=="1", \
+    ATTR{queue/scheduler}="bfq"
+
+# SSD
+ACTION=="add|change", KERNEL=="sd[a-z]*|mmcblk[0-9]*", ATTR{queue/rotational}=="0", \
+    ATTR{queue/scheduler}="mq-deadline"
+
+# NVMe SSD
+ACTION=="add|change", KERNEL=="nvme[0-9]*", ATTR{queue/rotational}=="0", \
+    ATTR{queue/scheduler}="none"

usr/lib/udev/rules.d/69-hdparm.rules

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+ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1", \
+    ATTRS{id/bus}=="ata", RUN+="/usr/bin/hdparm -B 254 -S 0 /dev/%k"

usr/lib/udev/rules.d/71-nvidia.rules

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+# Enable runtime PM for NVIDIA VGA/3D controller devices on driver bind
+ACTION=="add|bind", SUBSYSTEM=="pci", DRIVERS=="nvidia", \
+    ATTR{vendor}=="0x10de", ATTR{class}=="0x03[0-9]*", \
+    TEST=="power/control", ATTR{power/control}="auto"
+
+# Disable runtime PM for NVIDIA VGA/3D controller devices on driver unbind
+ACTION=="remove|unbind", SUBSYSTEM=="pci", DRIVERS=="nvidia", \
+    ATTR{vendor}=="0x10de", ATTR{class}=="0x03[0-9]*", \
+    TEST=="power/control", ATTR{power/control}="on"

usr/lib/udev/rules.d/99-cpu-dma-latency.rules

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+DEVPATH=="/devices/virtual/misc/cpu_dma_latency", OWNER="root", GROUP="audio", MODE="0660"