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Hello everyone.
In short: I would like to boot using the linux-rt kernel. But GRUB only lets me boot Arch with no further options (vanilla kernel). I don't know what I have to do to be able to use the linux-rt kernel on this computer.
More info: I used the archinstall command to install Arch on this computer. It's installed on an encrypted M.2 Btrfs SSD. There are no other OSes on this machine. I installed GRUB retroactively after the rest of the installation was already done.
I made changes to /etc/default/grub and I also tried editing GRUB with the GUI tool GRUB Customizer. But both the changes I made in the config file and the ones I made with the tool were to no avail. When I enter GRUB on boot, I get exactly two options: "Arch Linux" and rebooting into UEFI firmware. The "Arch Linux" option boots using the vanilla kernel. There are no other options or sub-menus available in GRUB.
There must be something I'm missing here. Is there anything else I have to configure or change in regards to GRUB? I would be very grateful for any help with this issue.
Further possibly relevant information is attached to the rest of this post. Thanks in advance for your help.
linux 5.12.3.arch1-1
linux-rt 5.11.4.11.arch1-1
# GRUB boot loader configuration
GRUB_DEFAULT="saved"
GRUB_TIMEOUT="5"
GRUB_DISTRIBUTOR="Arch"
GRUB_CMDLINE_LINUX_DEFAULT="loglevel=3 quiet"
GRUB_CMDLINE_LINUX="cryptdevice=/dev/nvme0n1p2:cryptroot:allow-discards"# 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 `vbeinfo'
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="/boot/grub/themes/starfield/theme.txt"# 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"
Generating grub configuration file ...
Found theme: /boot/grub/themes/starfield/theme.txt
Found linux image: /boot/vmlinuz-linux-rt
Found initrd image: /boot/initramfs-linux-rt.img
Found fallback initrd image(s) in /boot: initramfs-linux-rt-fallback.img
Found linux image: /boot/vmlinuz-linux
Found initrd image: /boot/initramfs-linux.img
Found fallback initrd image(s) in /boot: initramfs-linux-fallback.img
Found linux image: /boot/vmlinuz-linux-rt
Found initrd image: /boot/initramfs-linux-rt.img
Found fallback initrd image(s) in /boot: initramfs-linux-rt-fallback.img
Found linux image: /boot/vmlinuz-linux
Found initrd image: /boot/initramfs-linux.img
Found fallback initrd image(s) in /boot: initramfs-linux-fallback.img
Detecting snapshots ...
Info: Separate boot partition detected
Warning: snapper detected but config 'root' does not exist
No snapshots found.
If you think an error has occurred , please file a bug report at " https://github.com/Antynea/grub-btrfs "
Nothing to do. Abort.
done
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