</biblioentry>
 
   </bibliography>
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     <para>These ioctls are optional, drivers need not implement
 them. If so, they return the &EINVAL;.</para>
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 follow SGI's lead, and adopt a multimedia timestamping system like
 their UST (Unadjusted System Time). See
 http://web.archive.org/web/*/http://reality.sgi.com
-/cpirazzi_engr/lg/time/intro.html. 
+/cpirazzi_engr/lg/time/intro.html.
 UST uses timestamps that are 64-bit signed integers
 (not struct timeval's) and given in nanosecond units. The UST clock
 starts at zero when the system is booted and runs continuously and
       </itemizedlist>
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 linkend="userp">user pointer</link>) I/O. See <xref
 linkend="io" /> for details.</para>
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 I/O.</para>
 
   <para>[to do]</para>
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 functions, or through the streaming I/O mechanism.</para>
 
   <para>[to do]</para>
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 event you want to subscribe to whether this is applicable for that event or not.</para>
        </listitem>
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 however the framebuffer interface of the driver may support the
 <constant>FBIOBLANK</constant> ioctl.</para>
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 linkend="userp">user pointer</link>) I/O. See <xref
 linkend="io" /> for details.</para>
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     <para>To start or stop the frame buffer overlay applications call
 the &VIDIOC-OVERLAY; ioctl.</para>
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 &VIDIOC-G-MODULATOR; ioctl
 reports the supported frequency range.</para>
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 unavailable, for example the device is already in use by another
 process.</para>
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       </tgroup>
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   <para>Modern devices all use the <link linkend="raw-vbi">raw</link> or
 <link linkend="sliced">sliced</link> VBI API.</para>
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     <para>to do</para>
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     the parameter remains unmodified.</para>
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        </mediaobject>
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