No signal on display after booting from initial installation

[Aragorn]

I can give you the instructions on how to chroot into a stock btrfs install, but I have no idea with regard to the OP’s graphics problems.

@Aragorn

In the instructions below, I will for the sake of this tutorial assume that…

• your machine boots in native UEFI mode;
• your EFI system partition is on /dev/sda1; and…
• your root filesystem is on /dev/sda2 and uses the default subvolume layout as installed by calamares (i.e. the Manjaro installer).

It is of course important that you adapt the instructions below to your actual situation — i.e. you should use the actual block devices for the EFI partition and the btrfs volume on your machine — but with the default configuration in mind, here’s how you would chroot into your btrfs installation…

mount -t btrfs -o subvol=@ /dev/sda2 /mnt
mount -t btrfs -o subvol=@home /dev/sda2 /mnt/home
mount -t btrfs -o subvol=@log /dev/sda2 /mnt/var/log
mount -t btrfs -o subvol=@cache /dev/sda2 /mnt/var/cache
mount -t vfat  /dev/sda1 /mnt/boot/efi
mount --bind /dev /mnt/dev
mount -t proc proc /mnt/proc
mount -t sysfs sysfs /mnt/sys
mount -t efivarfs efivarfs /mnt/sys/firmware/efi/efivars
chroot /mnt /bin/bash