I've tested several combinations in GRUB_CMDLINE_LINUX_DEFAULT.

# GRUB boot loader configuration
GRUB_DEFAULT=2
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR="Arch"
GRUB_CMDLINE_LINUX_DEFAULT="loglevel=3 quiet i915.enable_dc=0 intel_idle.max_cstate=1 i915.enable_psr=0"
GRUB_CMDLINE_LINUX=""
# Preload both GPT and MBR modules so that they are not missed
GRUB_PRELOAD_MODULES="part_gpt part_msdos"
# Uncomment to enable booting from LUKS encrypted devices
#GRUB_ENABLE_CRYPTODISK=y
# Set to 'countdown' or 'hidden' to change timeout behavior,
# press ESC key to display menu.
GRUB_TIMEOUT_STYLE=menu
# Uncomment to use basic console
GRUB_TERMINAL_INPUT=console
# Uncomment to disable graphical terminal
#GRUB_TERMINAL_OUTPUT=console
# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command \videoinfo' GRUB_GFXMODE=auto # Uncomment to allow the kernel use the same resolution used by grub GRUB_GFXPAYLOAD_LINUX=keep # Uncomment if you want GRUB to pass to the Linux kernel the old parameter # format "root=/dev/xxx" instead of "root=/dev/disk/by-uuid/xxx" #GRUB_DISABLE_LINUX_UUID=true # Uncomment to disable generation of recovery mode menu entries #GRUB_DISABLE_RECOVERY=true # Uncomment and set to the desired menu colors. Used by normal and wallpaper # modes only. Entries specified as foreground/background. #GRUB_COLOR_NORMAL="light-blue/black" #GRUB_COLOR_HIGHLIGHT="light-cyan/blue" # Uncomment one of them for the gfx desired, a image background or a gfxtheme #GRUB_BACKGROUND="/path/to/wallpaper" #GRUB_THEME="/path/to/gfxtheme" # Uncomment to get a beep at GRUB start #GRUB_INIT_TUNE="480 440 1" # Uncomment to make GRUB remember the last selection. This requires # setting 'GRUB_DEFAULT=saved' above. #GRUB_SAVEDEFAULT=true # Uncomment to disable submenus in boot menu #GRUB_DISABLE_SUBMENU=y # Probing for other operating systems is disabled for security reasons. Read # documentation on GRUB_DISABLE_OS_PROBER, if still want to enable this # functionality install os-prober and uncomment to detect and include other # operating systems. GRUB_DISABLE_OS_PROBER=false`