I've just tried what you tell Ming and it seems I didn't do the things perfectly.
First I disabled lightdm, and not gdm: ok
After a reboot, once loged on my pc on the tty1, I try the command: sudo echo 9 > /proc/sys/kernel/printk
Here is the problem, it answers me: bash: /proc/sys/kernel/printk: Permission non accordée (not allowed)
I however tried a reboot and I attach the two syslog files I found in the folder /var/log/ to this message. Maybe useless, I don't know cause I don't understand everything I did.
I've just tried what you tell Ming and it seems I didn't do the things perfectly.
First I disabled lightdm, and not gdm: ok
After a reboot, once loged on my pc on the tty1, I try the command:
sudo echo 9 > /proc/sys/ kernel/ printk
bash: /proc/sys/ kernel/ printk: Permission non accordée (not allowed)
Here is the problem, it answers me:
I however tried a reboot and I attach the two syslog files I found in the folder /var/log/ to this message. Maybe useless, I don't know cause I don't understand everything I did.