Blank display when in initramfs making it impossible to see LUKS password prompt (solution included)
The screen turns black after u-boot loads the initramfs image. After typing the LUKS password blindly, the display switches on again and the boot proceeds as normal.
It turns out that a recent kernel change introduced a new module
panel_edp which is split off from the
panel_simple module. The manjaro-arm-installer adds the
panel_simple module to
/etc/mkinitcpio.conf for encrypted root. This was the module that enabled the video display during initial boot (i.e. initramfs). However, with recent kernels the
panel_edp module is required. If I add
panel_edp to the
MODULES then I see the LUKS prompt again.