• Various kernel options
• https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html
• systemd-boot does not like apostrophes 'like this' , but GRUB handles it fine

preempt='full' threadirqs nohz='off'

• 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

idle=halt

• 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'

• 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 ¹⁾

acpi_osi='!' acpi_osi='Windows 2017'

• Does hard reboots
• reboot=efi causes a Dell Latitude 5591 to not reboot

reboot='pci'

reboot='efi'

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

mem_sleep_default='s2idle'

• iommu=off should not be used (source)

iommu='pt'

pci='pcie_bus_perf,realloc,pcie_scan_all,big_root_window'

intremap='off'

• https://docs.kernel.org/fb/modedb.html

• Necessary for Wayland, and also works on Xorg as an alternative to xorg.conf
• HDMI-A-1 is the same for an AMD 6600 XT and Intel UHD 630; it's possible this works for all GPUs or there's some standard?

• Increase refresh rate for 1080p from default 60Hz to 75Hz

video='HDMI-A-1:1920x1080MR@75'

• Solves instability on some AMD GPUs at 4K@60Hz on HDMI
• 2024/04/29: From old notes and untested

video='HDMI-A-1:3840x2160MR@60'

• https://fwupd.github.io/libfwupdplugin/hsi.html#org.fwupd.hsi.EncryptedRam
• Requires CPU SVM to be enabled in BIOS ²⁾
• Disable TSME in BIOS if using this

mem_encrypt='on'

• Allows use of Overdrive options for overclocking and increasing the Power Limit
• See 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

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

i915.enable_dc=0 i915.enable_fbc=0 i915.enable_psr=0 i915.enable_psr2_sel_fetch=0 i915.enable_hangcheck=0 i915.panel_use_ssc=0 i915.guc_log_level=0 i915.nuclear_pageflip=1 i915.request_timeout_ms=200000 i915.enable_guc=3

• TODO: HSI?

intel_iommu='on'

• This enables GuC and HuC firmware loading ³⁾

i915.enable_guc='3'

modprobe.blacklist='nouveau'

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

nvidia.NVreg_OpenRmEnableUnsupportedGpus='1'

nvidia-drm.modeset='1'

• TODO: Find information about this

nvidia.NVreg_UsePageAttributeTable='1'

• 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'

nvidia-smi -q | grep 'GSP'

• 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'

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

iomem='relaxed'