sudo grubby --args='acpi_osi=Linux' --update-kernel='ALL'

acpi_osi=Linux

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

sudo grubby --args='mem_sleep_default=s2idle' --update-kernel='ALL'

mem_sleep_default=s2idle

• If IOMMU is disabled in BIOS, this isn't needed
• iommu=off should not be used (source)

sudo grubby --update-kernel='ALL' --args='iommu=pt'

iommu=pt

sudo grubby --args='pci=pcie_bus_perf,realloc,pcie_scan_all,big_root_window' --update-kernel='ALL'

pci=pcie_bus_perf,realloc,pcie_scan_all,big_root_window

• 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
• This is necessary for Wayland, but also carries over to Xorg
• Refresh rate mismatch between Moonlight clients and Gamestream hosts computers introduces stuttering
• HDMI-A-1 is the same for an AMD 6600 XT and Intel UHD 630, it's possible this works for all GPUs?

sudo grubby --args='video=HDMI-A-1:1920x1080@74' --update-kernel='ALL'

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

• https://fwupd.github.io/libfwupdplugin/hsi.html#org.fwupd.hsi.EncryptedRam
• Requires CPU SVM to be enabled in BIOS ¹⁾
• Disable TSME in BIOS if using this

sudo grubby --args='mem_encrypt=on' --update-kernel='ALL'

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'

• See laptop_power_management

sudo grubby --update-kernel='ALL' --args='intel_pstate=disable processor.ignore_ppc=1'

• https://wiki.archlinux.org/title/CPU_frequency_scaling#Intel_performance_and_energy_bias_hint

• 0 = Performance
• 15 = Power-saving

cat '/sys/devices/system/cpu/cpu'*'/power/energy_perf_bias'

• TODO: HSI?

sudo grubby --update-kernel='ALL' --args='intel_iommu=on'

intel_iommu=on

• This enables Framebuffer compression, Panel self-refresh, and i915 Fastboot

sudo grubby --update-kernel='ALL' --args='i915.enable_fbc=1 i915.enable_psr=1 i915.fastboot=1'

i915.enable_fbc=1 i915.enable_psr=1 i915.fastboot=1

• This enables GuC and HuC firmware loading if supported by the hardware

sudo grubby --update-kernel='ALL' --args='i915.enable_guc=3'

i915.enable_guc=3

sudo grubby --update-kernel='ALL' --args='modprobe.blacklist=nouveau'

modprobe.blacklist=nouveau

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

sudo grubby --update-kernel='ALL' --args='nvidia.NVreg_OpenRmEnableUnsupportedGpus=1'

nvidia.NVreg_OpenRmEnableUnsupportedGpus=1

sudo grubby --update-kernel='ALL' --args='nvidia-drm.modeset=1'

nvidia-drm.modeset=1

• TODO: Find information about this

sudo grubby --update-kernel='ALL' --args='nvidia.NVreg_UsePageAttributeTable=1'

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 causes AoE2:DE to crash GNOME on-startup

sudo grubby --update-kernel='ALL' --args='nvidia.NVreg_EnableGpuFirmware=1'

nvidia.NVreg_EnableGpuFirmware=1'

nvidia-smi -q | grep 'GSP'

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

sudo grubby --update-kernel='ALL' --args='iomem=relaxed'

iomem=relaxed