Why is Gnome crashing?

[Linux for blind general discussion]

Hello everyone,

I recently installed Gnome 3. I am using a Braille display and brltty 5.6. on a Debian buster machine with 8 GB of RAM. Gnome runs on ttyh1 and tty2. I have 
ordinary logins on other consoles. When I switch to tty1 using Ctrl+Alt+F1 the display is completely inactive, not even spaces. When I switch back to another 
console I first see BRLTTY 5.6, then a pause and then the message "no irq handler for vector." What is causing this and what should I do about it?

Thanks,
John

-- 
John J. Boyer
Email: john.boyer at abilitiessoft.org
website: http://www.abilitiessoft.org
Status: Company dissolved but website and email addresses  live.
Location: Madison, Wisconsin, USA
Mission: developing assistive technology software and providing STEM services 
        that are available at no cost