How to debug the console?

Good evening,

When I try to run the hurd console from the mach console with

# console -d vga -d pc_mouse --repeat=mouse -d pc_kbd --repeat=kbd -c /dev/vcs

on my Toshiba netbook I just get a black screen and I cannot interact with the
computer. I presume the console did not crash but I get nothing on the screen
and I'm unable to kill it.
If I try to run the console on gdb with the -d vga option the screen goes black
again.
Is there a way to collect information that would be useful for debugging?

Regards,
João