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--- notes:kernel_parameters [2019/11/30 22:02] – Sean Rhone
+++ notes:kernel_parameters [2021/06/18 02:36] – removed Sean Rhone
@@ Line 1: / Line 1: @@
-====== Information ======
-  * Kernel parameters that were useful at some point in time
-====== Kernel Options ======
-===== blk_mq =====
-  * I think the kernel at some point removed non-blk schedulers, so this isn't necessary
-  scsi_mod.use_blk_mq=y dm_mod.use_blk_mq=y
-===== Corsair USB Quirks =====
-  * https://github.com/ckb-next/ckb-next/wiki/Troubleshooting#usbhid-quirks
-  usbcore.quirks=1b1c:1b38:gn,1b1c:1b3c:gn
-===== Blacklist Watchdogs =====
-  * ''iTCO_wdt'' controls watchdog on some Intel platforms
-  * ''sp5100_tco'' controls watchdog on some AMD platforms
-  * ''nowatchdog'' disables both soft and hard generic watchdogs
-  * Apparently this reduces power usage slightly
-  modprobe.blacklist=iTCO_wdt,sp5100_tco nowatchdog
-===== Microcode and Security Patches =====
-  * :!: This disables all protection
-  mitigations=off
-===== Modern Standby =====
-  * Use ''S0'' to suspend and wake quickly on supported systems
-  * On a Dell XPS 13 9360, this used to be required, but the default ''deep'' option also works
-  mem_sleep_default=s2idle
-===== dyntick-idle Disable =====
-  * KGPE-D16's [[https://www.coreboot.org/Board:asus/kgpe-d16#Installation_Notes|Coreboot installation notes]] mention needing this for better power saving
-  nohz=on
-===== intel_iommu =====
-  * :!: Check ''dmesg'' for any DMAR-related errors
-  intel_iommu=on
-===== i915 =====
-==== Safe ====
-  i915.enable_fbc=1
-  i915.fastboot=1
-==== Hardware-specific ====
-  * GuC firmware loading/submission **requires** PAVP to be enabled in BIOS
-  * :!: TODO: Figure out how to test PSR
-  i915.enable_psr=1
-  i915.enable_guc=3
-===== radeon =====
-****
-  radeon.deep_color=1
-===== Backlight =====
-  * https://www.freedesktop.org/software/systemd/man/kernel-command-line.html#systemd.restore_state=
-  * This prevents systemd from restoring previous backlight value on reboot
-  * This is necessary for [[#power_management|Power Management]]
-  systemd.restore_state=0
-===== DRM Debug =====
-  * :!: This may make lower-end machines become very unresponsive; be prepared to have some safe way of rebooting
-  drm.debug=0xe
-===== amdgpu =====
-  * Allows use of Overdrive options for overclocking
-  amdgpu.ppfeaturemask=0xffffffff
-==== Verify ====
-****
-  cat '/sys/module/amdgpu/parameters/ppfeaturemask' | grep '4294967295'
-===== PCI =====
-  * May be useful for eGPU and Thunderbolt limits on Macs
-  pci=nocrs,pcie_bus_perf
-===== Reboot =====
-  * ''efi'' is for UEFI systems
-  * ''pci'' is for Legacy systems and Coreboot with SeaBIOS payload
-  * There are other values possible should either of those not work
-  reboot=pci
-  reboot=efi
-===== Custom Resolution =====
-  * https://wiki.archlinux.org/index.php/kernel_mode_setting#Forcing_modes
-  * :!: This seems to only work on Wayland
-  * :!: 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
-  video=HDMI-A-1:3840x2160MR@59