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--- notes:kernel_parameters [2024/04/29 13:35] – Sean Rhone
+++ notes:kernel_parameters [2024/08/13 18:46] (current) – removed Sean Rhone
@@ Line 1: / Line 1: @@
-====== 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'
-==== Spinesnap ====
-  * :?: 2024/04/29: With ''dmesg'', Intel HID seemingly isn't presented with Windows OSI on Dell Latitude 5591, but is with Linux OSI
-<code>
-[    9.929236] input: Intel HID events as /devices/platform/INT33D5:00/input/input21
-[    9.929687] intel-hid INT33D5:00: platform supports 5 button array
-[    9.929722] input: Intel HID 5 button array as /devices/platform/INT33D5:00/input/input22</code>
-===== 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'
-===== 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'