====== Information ======

  * Various kernel options
  * https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html

====== General ======

===== Low-Latency =====

****

  preempt='full' threadirqs nohz='off'

===== OSI =====

  * https://forum.manjaro.org/t/how-to-choose-the-proper-acpi-kernel-argument/1405
  * https://learn.microsoft.com/en-us/windows-hardware/drivers/acpi/winacpi-osi

  acpi_osi='Linux'

  acpi_osi='Windows 2017'

===== Modern Standby =====

  * https://fwupd.github.io/libfwupdplugin/hsi.html#org.fwupd.hsi.SuspendToIdle

  mem_sleep_default='s2idle'

===== IOMMU =====

  * :!: ''iommu=off'' should not be used ([[http://www.xillybus.com/tutorials/iommu-swiotlb-linux|source]])

  iommu='pt'

===== PCI =====

****

  pci='pcie_bus_perf,realloc,pcie_scan_all,big_root_window'

===== Interrupt Remapping =====

****

  intremap='off'

===== Custom Resolution =====

  * For an Acer S271H7 even though it can do 75Hz, this option sets one of the display timings too-high and 75Hz can't be reduced-blanked here; 74Hz is close enough
  * Necessary for Wayland, and also seemingly works as an alternative to ''xorg.conf'' on Xorg
  * ''HDMI-A-1'' is the same for an AMD 6600 XT and Intel UHD 630, it's possible this works for all GPUs?

  video='HDMI-A-1:1920x1080@74'

====== AMD ======

===== Memory Encryption =====

  * https://fwupd.github.io/libfwupdplugin/hsi.html#org.fwupd.hsi.EncryptedRam
  * :!: Requires CPU SVM to be enabled in BIOS ((AMDGPU will likely panic on-boot if ''mem_encrypt'' is enabled without SVM))
  * Disable TSME in BIOS if using this

  mem_encrypt='on'

====== AMDGPU ======

===== Overclocking =====

  * Allows use of Overdrive options for overclocking and increasing the Power Limit
  * See [[https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/amd/include/amd_shared.h#L203|amd_shared.h]] for more ''PP_FEATURE_MASK'' values
  * :!: ''0xffffffff'' can be used to enable everything, but may cause issues with unstable features

  sudo grubby --args='amdgpu.ppfeaturemask=0xfff7ffff' --update-kernel='ALL'

  amdgpu.ppfeaturemask=0xfff7ffff

==== Verify ====

****

  cat '/sys/module/amdgpu/parameters/ppfeaturemask'

====== Intel ======

===== i915 =====

****

  i915.enable_fbc='0' i915.enable_psr='0' i915.panel_use_ssc='0' i915.nuclear_pageflip='1' i915.edp_vswing='2'

===== IOMMU =====

  * TODO: HSI?

  intel_iommu='on'

===== Firmware =====

  * This enables GuC and HuC firmware loading ((do this even if unsure because seemingly not even Intel is aware of how certain hardware pre-12th-gen/AL loads the firmware; worst-case it just won't load))

  i915.enable_guc='3'

====== NVIDIA ======

===== Open Module =====

==== Blacklist nouveau ====

****

  modprobe.blacklist='nouveau'

==== Allow Unsupported GPUs ====

  * https://github.com/NVIDIA/open-gpu-kernel-modules#compatible-gpus

  nvidia.NVreg_OpenRmEnableUnsupportedGpus='1'

==== Enable nvidia-modeset ====

****

  nvidia-drm.modeset='1'

===== PAT =====

  * TODO: Find information about this

  nvidia.NVreg_UsePageAttributeTable='1'

===== GSP =====

  * https://us.download.nvidia.com/XFree86/Linux-x86_64/515.65.01/README/gsp.html
  * Allows loading of GSP firmware
  * This doesn't appear necessary for the open kernel module
  * :!: 2022/07/20 515.57: this caused AoE2:DE to crash GNOME on-startup

  nvidia.NVreg_EnableGpuFirmware='1'

==== Verify ====

****

  nvidia-smi -q | grep 'GSP'

====== CORSAIR ======

  * https://github.com/ckb-next/ckb-next/wiki/Troubleshooting#usbhid-quirks
  * :!: Seemingly only needed with the mouse plugged directly to the motherboard, and not through USB-C docks

  usbcore.quirks='1b1c:1b75:bgmn'

====== Coreboot ======

===== Flashing =====

  * This is needed to relax permissions for Coreboot firmware to be flashed internally
  * :!: This should be removed after flashing

  iomem='relaxed'