Helloo Everyone, I will first describe the problems and then ask some questions. I don't claim to be a Linux expert. My ignorance will be evident to the real experts. I have a Debian Buster system with 8 GB of memory. It is less than four years old. Recently I installed Gnome 3.3 with Orca. I use Braille only and no speech, since I am deaf-blind. The Braille display is a Focus 40 connected to a USB port. A technician from a local computer company installed TeamViewer so he could help with problems remotely, but he seems puzzled by the ones I am encountering. When the system boots the desktop comes up on tty1 and ty2. It appears to be functiooning fairly well. TeamViewer is running and asking for a partner. I can run Firefox and surf the web. However, eventually the Braille display becomes unresponsive. It keeps showing the same thing, no matter what I do on the keyboard. Sighted companions tell me the screen is responding appropriately. I can switch to other consoles using ctrl+Alt+Fn and run command-line programs. However, when I switch back to tty1 or tty2 the Braille display acts as if the USB port has been disabled. It appears to have been turned off. Switching to any other console produces the message "no irq handler for vector and BRLTTY5.6. After a while the console behaves normally for command-line use. The desktop seems to disappear completely. I can switch consoles with Alt+Fn. Except to tty1 and tty2, which hang up. Questions: 1. How is the desktop started at boot time? What script or program starts it and how is it called? 2. The problem with the Braille display becoming unresponsive and continuing to show the same thing must be a problem with Orca. It apears to work properly for the most part, but I can't use help mode. I have asked about these problems on the Orca list, but they were no help. 3. The desktop runs functions from several libraries. Which of those might be crashing? How is it possible for something not running as root to produce an interrupt with no handler? Thanks, John -- John J. Boyer Email: john.boyer@xxxxxxxxxxxxxxxxx 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 _______________________________________________ Blinux-list mailing list Blinux-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/blinux-list