Ubuntu 7.04/Issues/Screen goes blank when switching consoles
Description: On a fully booted system, switching from X (tty7) to any virtual console and then back to X causes the screen to go blank.
Systems Affected: Dimension E520n, XPS 410n
Impact: Unable to use X
Workaround: Reboot the system.
Fix: Install xserver-xorg-video-intel driver available in the Ubuntu 7.04 Universe repository. This driver that fixes the problem is already installed and should load by default if your system came pre-installed with the OS from Dell.
To install the xserver-xorg-video-intel driver:
$ sudo apt-get install xserver-xorg-video-intel
Then restart, or log out of, your X Window session