按下Alt+Ctrl+F1后屏幕显示^@^@^@，操作陷入循环求助

Hey there, let’s work through this frustrating issue where your tty fills up with ^@ characters (those are null bytes, by the way) and locks into an infinite loop when you try to do anything. This usually boils down to a misconfiguration between your system’s text console and hardware/drivers. Here’s how to fix it:

• Escape the stuck tty first
  Press Alt+Ctrl+F7 (or F8, depending on your Linux distro) to switch back to your graphical desktop. If that works, we can troubleshoot from there without being trapped in the loop.

• Reset the tty service
  Open a terminal on your desktop and run this command to restart the tty1 service—it often resets wonky console settings:

  sudo systemctl restart getty@tty1.service
  

• Fix console character and font settings
  Those null bytes might be coming from a mismatched character map. Edit /etc/default/console-setup and make sure:

  • CHARMAP is set to UTF-8
  • FONTFACE uses a supported font like Terminus
    Then run this to apply the changes:

  sudo dpkg-reconfigure console-setup
  

• Check graphics driver conflicts
  Proprietary graphics drivers (especially NVIDIA) are a common culprit here. If you’re using NVIDIA, try switching temporarily to the open-source nouveau driver to see if the issue clears up. For AMD users, update your Mesa drivers with:

  sudo apt update && sudo apt upgrade mesa-*
  

  (Adjust the command for your package manager if you’re on Fedora, Arch, etc.)

• Disable framebuffer console
  Some systems struggle with the framebuffer console. Edit /etc/default/grub and add nomodeset to the GRUB_CMDLINE_LINUX_DEFAULT line, so it looks something like:

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"
  

  Then run sudo update-grub and reboot—this forces the system to use a basic text console instead.

• Rule out hardware issues
  Try using a different wired keyboard to eliminate the chance your current keyboard is sending stray null signals. You can also check system logs for tty-related errors with:

  journalctl -b | grep tty
  

If none of these steps fix the loop, share more details like your Linux distro, graphics card model, and any recent system updates you installed—those will help pinpoint the exact cause.

内容的提问来源于stack exchange，提问作者vishnusait