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notes:kernel_parameters [2023/02/22 15:41] – [Generate] Sean Rhonenotes:kernel_parameters [2024/04/29 17:12] (current) – Sean Rhone
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 +====== Information ======
 +
 +  * Various kernel options
 +  * https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html
 +
 ====== General ====== ====== 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 ====
 +
 +  * :!: 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 ((with ''dmesg'' Intel HID 5 button array seemingly isn't presented with Windows OSI))
 +
 +  acpi_osi='!' acpi_osi='Windows 2017'
 +
 +===== Reboot =====
 +
 +  * Does hard reboots
 +  * :!: ''reboot=efi'' causes a Dell Latitude 5591 to not reboot
 +
 +  reboot='pci'
 +
 +  reboot='efi'
  
 ===== Modern Standby ===== ===== Modern Standby =====
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   * https://fwupd.github.io/libfwupdplugin/hsi.html#org.fwupd.hsi.SuspendToIdle   * 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'
- +
-  mem_sleep_default=s2idle+
  
 ===== IOMMU ===== ===== 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]])   * :!: ''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'
- +
-  iommu=pt+
  
 ===== PCI ===== ===== 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+  pci='pcie_bus_perf,realloc,pcie_scan_all,big_root_window'
  
-===== NVMe =====+===== Interrupt Remapping =====
  
-  * :!: This may need adjusted for different CPU core counts +****
-  * :!: Using ''8'' when SMT is disabled with a 2700X does **not** work as-expected ((either don't use this with SMT off, or keep SMT on)) +
-  * This had no notable benefit in 2022 with a 2700x and SK hynix P31, and was shown in unrelated benchmarks in 2019 to lower performance+
  
-  sudo grubby --args='nvme.poll_queues=16' --update-kernel='ALL'+  intremap='off'
  
-  nvme.poll_queues=16+===== Custom Resolution =====
  
-==== Verify ====+  * https://docs.kernel.org/fb/modedb.html
  
-  dmesg | grep 'nvme'+  * 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?
  
-  cat '/proc/interrupts'+==== Acer S721HL ====
  
-===== Custom Resolution =====+  * Increase refresh rate for 1080p from default 60Hz to 75Hz
  
-  * 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 +  video='HDMI-A-1:1920x1080MR@75'
-  * This is necessary for Wayland, but also carries over to Xorg +
-  * :!: Refresh rate mismatch between Moonlight clients and Gamestream hosts computers introduces stuttering+
  
-  sudo grubby --args='video=HDMI-A-1:1920x1080@74' --update-kernel='ALL'+==== TCL 55S405 ====
  
-  video=HDMI-A-1:1920x1080@74+  * 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'
  
 ====== AMD ====== ====== AMD ======
  
-==== Memory Encryption ====+===== Memory Encryption =====
  
   * https://fwupd.github.io/libfwupdplugin/hsi.html#org.fwupd.hsi.EncryptedRam   * https://fwupd.github.io/libfwupdplugin/hsi.html#org.fwupd.hsi.EncryptedRam
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   * Disable TSME in BIOS if using this   * Disable TSME in BIOS if using this
  
-  sudo grubby --args='mem_encrypt=on' --update-kernel='ALL' +  mem_encrypt='on'
- +
-  mem_encrypt=on+
  
 ====== AMDGPU ====== ====== AMDGPU ======
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   * Allows use of Overdrive options for overclocking and increasing the Power Limit   * Allows use of Overdrive options for overclocking and increasing the Power Limit
- 
-==== Generate ==== 
- 
-  * https://wiki.archlinux.org/title/AMDGPU#Boot_parameter 
-  * :!: This requires ''amdgpu.ppfeaturemask'' to not already be set 
- 
-  printf 'amdgpu.ppfeaturemask=0x%x\n' "$(($(cat /sys/module/amdgpu/parameters/ppfeaturemask) | 0x4000))" 
- 
-==== Kernel Option ==== 
- 
   * 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   * 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   * :!: ''0xffffffff'' can be used to enable everything, but may cause issues with unstable features
  
-  sudo grubby --args='amdgpu.ppfeaturemask=0xffffffff' --update-kernel='ALL'+  sudo grubby --args='amdgpu.ppfeaturemask=0xfff7ffff' --update-kernel='ALL'
  
-  amdgpu.ppfeaturemask=0xffffffff+  amdgpu.ppfeaturemask=0xfff7ffff
  
 ==== Verify ==== ==== Verify ====
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 ====== Intel ====== ====== Intel ======
  
-===== IOMMU =====+===== i915 =====
  
-  * TODO: HSI?+****
  
-  sudo grubby --update-kernel='ALL' --args='intel_iommu=on'+  i915.enable_fbc='0' i915.enable_psr='0' i915.panel_use_ssc='0' i915.nuclear_pageflip='1'
  
-  intel_iommu=on+===== IOMMU =====
  
-===== Optimizations ===== +  * TODO: HSI?
- +
-  * 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+  intel_iommu='on'
  
 ===== Firmware ===== ===== Firmware =====
  
-  * This enables GuC and HuC firmware loading if supported by the hardware+  * 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))
  
-  sudo grubby --update-kernel='ALL' --args='i915.enable_guc=3' +  i915.enable_guc='3'
- +
-  i915.enable_guc=3+
  
 ====== NVIDIA ====== ====== NVIDIA ======
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 ==== Blacklist nouveau ==== ==== Blacklist nouveau ====
  
-  sudo grubby --update-kernel='ALL' --args='modprobe.blacklist=nouveau'+****
  
-  modprobe.blacklist=nouveau+  modprobe.blacklist='nouveau'
  
 ==== Allow Unsupported GPUs ==== ==== Allow Unsupported GPUs ====
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   * https://github.com/NVIDIA/open-gpu-kernel-modules#compatible-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'
- +
-  nvidia.NVreg_OpenRmEnableUnsupportedGpus=1+
  
 ==== Enable nvidia-modeset ==== ==== Enable nvidia-modeset ====
  
-  sudo grubby --update-kernel='ALL' --args='nvidia-drm.modeset=1'+****
  
-  nvidia-drm.modeset=1+  nvidia-drm.modeset='1'
  
 ===== PAT ===== ===== PAT =====
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   * TODO: Find information about this   * TODO: Find information about this
  
-  sudo grubby --update-kernel='ALL' --args='nvidia.NVreg_UsePageAttributeTable=1' +  nvidia.NVreg_UsePageAttributeTable='1'
- +
-  nvidia.NVreg_UsePageAttributeTable=1+
  
 ===== GSP ===== ===== GSP =====
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   * Allows loading of GSP firmware   * Allows loading of GSP firmware
   * This doesn't appear necessary for the open kernel module   * This doesn't appear necessary for the open kernel module
-  * :!: 2022/07/20 515.57: this causes AoE2:DE to crash GNOME on-startup+  * :!: 2022/07/20 515.57: this caused AoE2:DE to crash GNOME on-startup
  
-  sudo grubby --update-kernel='ALL' --args='nvidia.NVreg_EnableGpuFirmware=1' +  nvidia.NVreg_EnableGpuFirmware='1'
- +
-  nvidia.NVreg_EnableGpuFirmware=1'+
  
 ==== Verify ==== ==== Verify ====
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   nvidia-smi -q | grep 'GSP'   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 ====== ====== Coreboot ======
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   * :!: This should be removed after flashing   * :!: This should be removed after flashing
  
-  sudo grubby --update-kernel='ALL' --args='iomem=relaxed' +  iomem='relaxed'
- +
-  iomem=relaxed+
  
/var/www/wiki/data/attic/notes/kernel_parameters.1677098478.txt.gz · Last modified: 2023/02/22 15:41 by Sean Rhone