Vid wait

Name: vid_wait
Default value: "0"
Cvar flags: None
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   Type: Variable

   Default: 0

   Description: Sets the type of waiting for the video adapter signal.

   Values:

   0 - No waiting.

   1 - Wait for vertical sync active.

   2 - Wait for display enable active.

If Vertical Sync seems to have no effect for you, you might need to use the CVar is the See Also section.

If you have a ATi card, you might need to change OpenGL's
"Wait For Vertical Sync" option to either: Always Off or Default Off (that's if you want Vertical Sync off),
Default On or Always On (that's if you want Vertical Sync On). Using Default On or Default Off will allow you turn Vertical Sync on&off at will while inside games.

See Also:
_vid_wait_override