I just did a
apt update && apt full-upgrade and a new kernel was installed:
Taking backup of imx8mq-librem5-r4.dtb.
Installing new imx8mq-librem5-r4.dtb.
flash-kernel: installing version 6.4.0-1-librem5
Generating boot script u-boot image... done.
Taking backup of boot.scr.
Installing new boot.scr.
purism@pureos:~$ df -kh /boot
Filesystem Size Used Avail Use% Mounted on
/dev/mmcblk0p1 451M 217M 211M 51% /boot
purism@pureos:~$ sudo reboot
The system came up fine but with very reduced display brightness which makes it difficult to enter the disk encryption key and the PIN of the SIM. And only then you have access to the slider to update the brightness again to a normal value.
This is not the first time that this happened. Why modifies a kernel image this configuration? And, how it could be set by a command from a SSH session?