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--- notes:kernel_parameters [2019/04/23 14:08] – Sean Rhone
+++ notes:kernel_parameters [2024/01/24 11:07] (current) – Sean Rhone
@@ Line 1: / Line 1: @@
 ====== Information ======
-  * Kernel parameters that were useful at some point in time
+  * Various kernel options
+  * https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html
-====== Kernel Options ======
+====== General ======
-===== Microcode and Security Patches =====
+===== Low-Latency =====
-  * https://access.redhat.com/articles/3311301
+****
-  * :!: This disables all protection
-  spectre_v2=off nopti
+  preempt='full' threadirqs nohz='off'
-===== Corsair USB Quirks =====
+===== OSI =====
-  * https://github.com/ckb-next/ckb-next/wiki/Troubleshooting#usbhid-quirks
+  * 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
-  usbcore.quirks=1b1c:1b38:gn,1b1c:1b3c:gn
+  acpi_osi='Linux'
+  acpi_osi='Windows 2017'
 ===== Modern Standby =====
-  * Use ''S0'' to suspend and wake quickly on supported systems
+  * https://fwupd.github.io/libfwupdplugin/hsi.html#org.fwupd.hsi.SuspendToIdle
-  * On a Dell XPS 13 9360, this used to be required, but the default ''deep'' option also works
-  mem_sleep_default=s2idle
+  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 =====
-  * GuC firmware loading/submission **requires** PAVP to be enabled in BIOS
+****
-  * ''enable_guc'' nor ''enable_psr'' work on a Lenovo T500 ThinkPad
-  i915.enable_psr=1 i915.enable_guc=3
+  i915.enable_fbc='0' i915.enable_psr='0' i915.panel_use_ssc='0' i915.nuclear_pageflip='1' i915.edp_vswing='2'
-===== radeon =====
+===== 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 ====
 ****
-  radeon.deep_color=1
+  modprobe.blacklist='nouveau'
-===== Backlight =====
+==== Allow Unsupported GPUs ====
-  * https://www.freedesktop.org/software/systemd/man/kernel-command-line.html#systemd.restore_state=
+  * https://github.com/NVIDIA/open-gpu-kernel-modules#compatible-gpus
-  * This prevents systemd from restoring previous backlight value on reboot
-  * This is necessary for [[#power_management|Power Management]]
-  systemd.restore_state=0
+  nvidia.NVreg_OpenRmEnableUnsupportedGpus='1'
-===== DRM Debug =====
+==== Enable nvidia-modeset ====
-  * :!: This may make lower-end machines become very unresponsive; be prepared to have some safe way of rebooting
+****
-  drm.debug=0xe
+  nvidia-drm.modeset='1'
-===== Custom Resolution =====
+===== 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 =====
-  * https://wiki.archlinux.org/index.php/kernel_mode_setting#Forcing_modes
+  * This is needed to relax permissions for Coreboot firmware to be flashed internally
-  * :!: This seems to only work on Wayland
+  * :!: This should be removed after flashing
-  * :!: On Nightwane, using the refresh rate ''59'' in the below command works in Wayland, but not ''60''
-  for p in /sys/class/drm/*/status; do con=${p%/status}; echo -n "${con#*/card?-}: "; cat $p; done
+  iomem='relaxed'
-  video=HDMI-A-1:3840x2160MR@59