Grub
Speculation protection disable
GRUB_CMDLINE_LINUX="mitigations=off"
older then5.1.13
GRUB_CMDLINE_LINUX="PR_SPEC_DISABLE_NOEXEC nospectre_v2 nospectre_v1"
No sound after upgrading to linux 5.4.1
GRUB_CMDLINE_LINUX="snd_hda_intel.dmic_detect=0"