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--- notes:kernel_parameters [2023/07/23 16:54] – Sean Rhone
+++ notes:kernel_parameters [2024/08/13 18:46] (current) – removed Sean Rhone
@@ Line 1: / Line 1: @@
-====== General ======
-===== Linux OSI =====
-  sudo grubby --args='acpi_osi=Linux' --update-kernel='ALL'
-  acpi_osi=Linux
-===== Modern Standby =====
-  * 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
-===== IOMMU =====
-  * If IOMMU is disabled in BIOS, this isn't needed
-  * :!: ''iommu=off'' should not be used ([[http://www.xillybus.com/tutorials/iommu-swiotlb-linux|source]])
-  sudo grubby --update-kernel='ALL' --args='iommu=pt'
-  iommu=pt
-===== PCI =====
-  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
-===== 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
-  * This is necessary for Wayland, but also carries over to Xorg
-  * ''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
-====== 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
-  sudo grubby --args='mem_encrypt=on' --update-kernel='ALL'
-  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 ======
-===== IOMMU =====
-  * TODO: HSI?
-  sudo grubby --update-kernel='ALL' --args='intel_iommu=on'
-  intel_iommu=on
-===== Firmware =====
-  * This enables GuC and HuC firmware loading ((do this even if unsure if the hardware will load it because seemingly not even Intel is aware of certain hardware pre-AL loading firmware; worst-case it just won't load))
-  sudo grubby --update-kernel='ALL' --args='i915.enable_guc=3'
-  i915.enable_guc=3
-===== Performance Test =====
-  * 2023/07/19: This improved ''glxgears'' slightly but made no notable difference anywhere else
-  * :!: ''idle=poll'' mentions it being undesired for HT/SMT, and also overheats a 5591 laptop instantly with TurboBoost enabled ((there's no benefit but if ''idle=poll'' must be tried: disable SST (speed shift tech), HT, TurboBoost, C-States, and SpeedStep))
-  mitigations=off idle=poll ahci.mobile_lpm_policy=1 i915.enable_fbc=0 i915.enable_psr=0 i915.mitigations=off i915.enable_dc=0 i915.panel_use_ssc=0 i915.nuclear_pageflip=1 i915.edp_vswing=2 i915.enable_ips=0 i915.disable_power_well=1
-====== NVIDIA ======
-===== Open Module =====
-==== Blacklist nouveau ====
-  sudo grubby --update-kernel='ALL' --args='modprobe.blacklist=nouveau'
-  modprobe.blacklist=nouveau
-==== Allow Unsupported GPUs ====
-  * https://github.com/NVIDIA/open-gpu-kernel-modules#compatible-gpus
-  sudo grubby --update-kernel='ALL' --args='nvidia.NVreg_OpenRmEnableUnsupportedGpus=1'
-  nvidia.NVreg_OpenRmEnableUnsupportedGpus=1
-==== Enable nvidia-modeset ====
-  sudo grubby --update-kernel='ALL' --args='nvidia-drm.modeset=1'
-  nvidia-drm.modeset=1
-===== PAT =====
-  * TODO: Find information about this
-  sudo grubby --update-kernel='ALL' --args='nvidia.NVreg_UsePageAttributeTable=1'
-  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 causes AoE2:DE to crash GNOME on-startup
-  sudo grubby --update-kernel='ALL' --args='nvidia.NVreg_EnableGpuFirmware=1'
-  nvidia.NVreg_EnableGpuFirmware=1'
-==== Verify ====
-****
-  nvidia-smi -q | grep 'GSP'
-====== Coreboot ======
-===== Flashing =====
-  * 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