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

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

===== systemd-boot =====

  * :!: 2024: ''systemd-boot'' doesn't handle typewriter apostrophes '''like this' '', but GRUB handles it fine ((above kernel params page mentions double-quote usage))
  * :!: 2024/05/18: ''systemd-boot'' on [[linux;distros;opensuse_tumbleweed_gnome|oS TW]] doesn't delete old ''initrd''s automatically, doesn't handle typewriter apostrophes, doesn't support ''dracut.conf'' settings, and doesn't seem faster than GRUB

====== Resources ======

===== General =====

  * https://fwupd.github.io/libfwupdplugin/hsi.html#org.fwupd.hsi.SuspendToIdle
  * :!: ''iommu=off'' should not be used ([[http://www.xillybus.com/tutorials/iommu-swiotlb-linux|source]])
  * https://docs.kernel.org/fb/modedb.html
  * https://fwupd.github.io/libfwupdplugin/hsi.html#org.fwupd.hsi.EncryptedRam

===== CPU Idle =====

  * https://www.infradead.org/~mchehab/kernel_docs/admin-guide/pm/cpuidle.html#idle-states-control-via-kernel-command-line
  * https://docs.kernel.org/admin-guide/pm/cpuidle.html
  * https://community.intel.com/t5/Software-Tuning-Performance/Benchmark-performance-increases-with-deeper-C-states-linux/td-p/1051623

===== 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

==== Spinesnap ====

  * :!: Dell Latitude 5591 needs ''!'' also to force Windows OSI
  * :!: 2024/04/29: Forcing Windows OSI causes brightness buttons on the built-in keyboard to not function ((with ''dmesg'' Intel HID 5 button array seemingly isn't presented with Windows OSI))

  acpi_osi='!' acpi_osi='Windows 2017'

====== Spinesnap ======

===== General =====

****

<code>acpi_osi='Linux' reboot='pci' nohz='off' preempt='none' cpuidle.off='1'</code>

===== PCI =====

****

<code>enable_mtrr_cleanup iomem='relaxed' pcie_ports='native' pci='nocrs,pcie_bus_perf,realloc,pcie_scan_all,big_root_window'</code>

===== i915 =====

****

<code>i915.enable_fbc='0' i915.enable_psr='0' i915.panel_use_ssc='0' i915.enable_guc='3' i915.guc_log_level='0' i915.nuclear_pageflip='1' i915.enable_hangcheck='0'</code>

===== Mitigations =====

****

<code>mitigations='off' i915.mitigations='off'</code>

===== NVMe =====

****

<code>nvme.noacpi='1' nvme.poll_queues='4' nvme.use_threaded_interrupts='1'</code>

===== Power-saving =====

****

<code>nowatchdog modprobe.blacklist='iTCO_wdt' tsc='nowatchdog' ahci.mobile_lpm_policy='1' iwlmvm.power_scheme='1' nvme_core.default_ps_max_latency_us='0' pcie_aspm='off' pcie_port_pm='off' snd_hda_intel.power_save='0' usbcore.autosuspend='-1'</code>

===== Display =====

****

<code>video='HDMI-A-1:1920x1080MR@75'</code>

===== IOMMU =====

****

<code>swiotlb='noforce' iommu='force' intel_iommu='on'</code>

====== Other ======

<code>rootflags='data=writeback'</code>

<code>threadirqs</code>

<code>idle=halt</code>

<code>mem_sleep_default='s2idle'</code>

<code>intremap='off'</code>

<code>mem_encrypt='on'</code>

===== TPM Integrity =====

  * https://www.phoronix.com/news/Linux-TPM-Disable-PCR-Integrity
  * TODO: Option name (probably ''off'')

<code>tpm.disable_pcr_integrity=</code>

====== 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'

===== Disable PSR =====

  * :?: ''0x15'' was seen somewhere for something
  * 2025/03/04: Untested

  amdgpu.dcdebugmask=0x10

====== 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
  * :?: 2024/09/30: Without that quirk, mouse failed immediately after setting ''preempt=none'' from a USB-C dock

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