There are a few 'flags' parameters on VidMode calls, but none seem to
be defined in the headers.  For example, this is from the source to
xvidtune:

  /* Mode flags -- ignore flags not in V_FLAG_MASK */
  #define V_FLAG_MASK     0x1FF;
  #define V_PHSYNC        0x001 
  #define V_NHSYNC        0x002
  #define V_PVSYNC        0x004
  #define V_NVSYNC        0x008
  #define V_INTERLACE     0x010 
  #define V_DBLSCAN       0x020
  #define V_CSYNC         0x040
  #define V_PCSYNC        0x080
  #define V_NCSYNC        0x100

  These are the flags for the modeline calls.  Is this authoritative?
Shouldn't this be in the header?

  The call to retrieve the possible dot clocks also has a flags header,
but that whole call is completely undocumented.  By the source, it looks
like 1 means the dot clock is programmable.  It would be cool if these
were in xf86vmode.h.

  The maxclock value in the dot clock call, I'm not really sure what
that means.  It's defined to always return 128, and I'm kinda curious
what that really means.

  Thanks,
-- 
Billy Biggs
[EMAIL PROTECTED]
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