Dual Booting Slackware and Debian | Debian Keyboard and Mouse No Longer Work.
 

Below is what my lilo.conf looks like now. All was well
before I added Debian to the list. As in I installed
Debian, then Slack, modified lilo.conf, lilo update, now
the mouse and keyboard don't work at login screen
as if drivers were not loaded....

I also installed an Nvidia driver in Slackware before
reboot, and blacklisted nouveau.

***********************************************

# Slack bootable partition config begins

image = /boot/vmlinuz
root = /dev/sda3
label = Slack
read-only

# Slack bootable partition config ends
# Debian bootable partition config begins

image = /boot/vmlinuz
root = /dev/sdb1
label = Debian
read-only

# Debian bootable partition config ends

***********************************************

You are using the same kernel for both distros. If "/boot/vmlinuz" is the Slackware kernel then that will most certainly be a different kernel version than Debian would be running if you booted it properly.
The Slackware kernel will not be able to find any kernel modules in the Debian root filesystem. That is why your mouse and keyboard won't work.

Eric

Thanks Eric I noticed this as soon as I submitted my post. If your still there I'm curious as to if the line "vga=normal" (which I set mine vga value to 0x031b) will impact my framebuffer resolution when running Debian as well as Slack? If so could this be a problem (Do I have to find a compatible driver or setting for both)?

man 5 lilo.conf
 

I don't mean to butt in and respond when you directed the question to Eric, but you may find "man 5 lilo.conf" helpful. It shows an example of setting the vga parameter for a specific operating system instead of globally.