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Indeed.

The Intel Video Regression was an infamous problem in X11 with Intel on-board video cards. Eventually the problem went away only to be replaced by another series of bugs, at the time of writing X11 has not had good support for Intel video cards for more than two years.

A regression is a bug that is introduced in an upgrade, bugs are usually fixed by upgrades this is the opposite problem.

This problem could manifest in a number of ways.

1. Black screen with X cursor, locked keyboard movable mouse.
2. Black screen.
3. Garbled screen

In non-technical terms, what happened was that upon logging out or using the Display Manager "switch user" function the session does not properly hand the graphics card off to the new session.

It is also evident that the problem occasionally resulted in improper access to the video memory, as evidenced by the garbled screen (two separate instances of X11 are trying to write to the graphics memory at the same time and are overwriting each other's bits.)

When this occured, the only solution was to reset computer with the reset button. Normally this button should never be pressed, no other way to fix the problem was discovered.

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