I disable my framebuffer as explained at this page:
In the file "/etc/default/grub/grub", I add "nofb" to this line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nofb"
do a update-grub and I reboot the computer
At the reboot I still have framebuffer, to verify I'm using fbset:
# D: 176.429 MHz, H: 82.908 kHz, V: 77.196 Hz
geometry 1680 1050 1680 1050 32
timings 5668 208 32 16 4 208 4
I looked in my bios, there is no framebuffer option.
And in dmesg I have always the error message about vesafb.
And I still can not access to my TTY console.
another idea? Put "vga=" in the grub command line could disable framebuffer? I will get a try.