From: James Simmons <jsimmons@edgeglobal.com>
  To  : ggi-develop@eskimo.com
  Date: Sun, 20 Jun 1999 07:20:42 -0400 (EDT)

Re: beta2.0b2.1 fixes

> > Yes.  Our main problem is that the fbdev API has no notion of
> > "checkmode" like the LibGGI API does, so we have to do a lot of
> > guesswork, and until we set the mode we don't know for sure what 
> > it will be like.
> 
> Yes, I can't remember what the exact semantics of FB_ACTIVATE_TEST
> were supposed to be  but I would've liked them to be similar with 
> checkmode. As of now I don't think most of the drivers even check 
> that.

Actually FB_ACTIVATE_TEST is used to check a mode. All the drivers use
this. You create a fb_var_screeninfo struct and set var->activate to
FB_ACTIVATE_TEST. Then you use the FBIOPUT_VSCREENINFO with this value. It
will return a error if it didn't work. It always returns var back to the
user.