Booting with systemd-boot hangs on black screen with white caret
- 21 Feb 2019: Post was created (diff)
TL;DR: a black screen with a blank caret with systemd-boot is a symptom of a malformed mkinitcpio.conf file, resulting in an incomplete initramfs image.
I was updating my /etc/mkinitcpio.conf to enable resume from hibernation, when I noticed
there was a .pacnew version of the config file beside it. I went ahead and hand-edited the
new changes, added
resume to the list of
HOOKS, closed the file and ran
mkinitcpio -p linux.
Things seemed nice and dandy until I updated my kernel again. After a reboot, directly after UEFI POST sequence, I was dumped to a black screen with a single white caret, hanging indefinitely. No keyboard combinations worked, and even waiting two hours did nothing.
I booted the system up again with the Arch Linux installation medium and mounted my main disk.
I then ran a diff of the two mkinitcpio.conf versions to try and find the errors.
It appeared that in both my
MODULES and my
HOOKS section, I had surrounded the items in both
parentheses and a single pair of double quotes.
MODULES=("intel_agp i915") HOOKS=("base udev keyboard keymap consolefont autodetect modconf block efiverify encrypt lvm2 resume decryption-keys filesystems fsck")
The main upstream package change of the mkinitcpio.conf file was to switch from a single set of double quotes to signify lists, into using bash array notation.
# Old format list="a b c d e f g" # New format (bash array notation) list=(a b c d e f g) # What I did wrong in my mkinitcpio.conf file list=("a b c d e f g")
The last example resulted in the
list variable containing an array with a single item,
hence early boot process unable to load required modules and run initial hooks.
I suspect I must’ve missed some warnings from pacman hooks after the system upgrade when it generated the new initramfs images.
But the conclusion is that a black screen with a blank caret with
systemd-boot is a symptom
of a malformed mkinitcpio.conf file, resulting in an incomplete initramfs image.
- man mkinitcpio.conf