• Kernel parameters that were useful at some point in time

• Use grubby instead unless it doesn't exist by-default

sudo -e '/etc/default/grub' && sudo grub2-mkconfig -o '/boot/efi/EFI/fedora/grub.cfg'

sudo -e '/etc/default/grub' && sudo grub2-mkconfig -o '/boot/grub2/grub.cfg'

• 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

• https://github.com/ckb-next/ckb-next/wiki/Troubleshooting#usbhid-quirks

usbcore.quirks=1b1c:1b38:gn,1b1c:1b3c:gn

• 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

• https://access.redhat.com/articles/3311301
• This disables all protection

spectre_v2=off nopti

• 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

• KGPE-D16's Coreboot installation notes mention needing this for better power saving

nohz=on

intel_iommu=on

• GuC firmware loading/submission requires PAVP to be enabled in BIOS
• enable_guc nor enable_psr work on a Lenovo T500 ThinkPad

i915.enable_psr=1

i915.enable_guc=3

radeon.deep_color=1

• 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

systemd.restore_state=0

• This may make lower-end machines become very unresponsive; be prepared to have some safe way of rebooting

drm.debug=0xe

• 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

• 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