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<A HREF="ark.html"><EM> Information for ARK Logic Chipset Users</EM></A>
 <b>:</b> <EM>Acceleration </EM><BR>
<b>Previous:</b> <A HREF="ark2.html"><EM>Supported RAMDACs </EM></A><BR>
<b>Next:</b> <A HREF="ark4.html"><EM>Basic configuration </EM></A>


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  <H2><A NAME="3"></A>3. Acceleration </H2>

<p>The driver takes full advantage of the new XAA (XFree86 Acceleration
Architecture) in the SVGA server. In fact the ARK driver was the
initial XAA development platform. Most common graphics operations are
accelerated, including most types of rectangular and non-rectangular
filling, screen-to-screen BitBLTs, line drawing, and text and bitmap
expansion. Expect over 300k xstones on a 2MB ARK2000PV/MT.</p>
<p>At 24bpp, acceleration is less complete, but curiously, greyscale colors
permit faster drawing. If you suspect a problem with acceleration, use
the "noaccel" option. If text or bitmaps do not seem to be rendered
correctly, you could try the "xaa_no_col_exp" option. To disable the
pixmap cache, use "no_pixmap_cache".</p>
<p>The hardware cursor is disabled by default. With unmodified mode timings,
there used to be two horizontal lines and a band following the mouse
pointer over the screen. The driver now automatically modifies the
mode timing to eliminate this effect; this has not been tested on
all possible configurations. Use the "hw_cursor" option to enable the
hardware cursor.</p>
<p>Linear addressing is the default mode of operation. If the server
does not start correctly, you may want to try the "no_linear" option.</p>
<p>The older ARK1000VL is probably not compatible with acceleration. Use
the "noaccel" and "no_linear" options.</p>

 <HR NOSHADE>
<A HREF="ark.html"><EM> Information for ARK Logic Chipset Users</EM></A>
 <b>:</b> <EM>Acceleration </EM><BR>
<b>Previous:</b> <A HREF="ark2.html"><EM>Supported RAMDACs </EM></A><BR>
<b>Next:</b> <A HREF="ark4.html"><EM>Basic configuration </EM></A>



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