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<A HREF="SiS.html"><EM> Information for SiS Users</EM></A>
 <b>:</b> <EM>Modelines </EM><BR>
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  <H2><A NAME="4"></A>4. Modelines </H2>

<p>When constructing a modeline for use with the Sis
driver you'll need to consider several points:
<ul>
<li>H/W Acceleration.  The H/W cursor, and fill operations
currently allocate memory of the video ram for there own use.
If this is not available these functions will automatically be
disabled. Also, ext_eng_queue allocate 32k of Vram. </li>
<li>Dot Clock. SiS documents the following video modes to work with 
6326. The max dot clock allowable for your 6326 based board depends 
also on the memory installed on it. Option fast_vram can be needed 
for high dot clocks to work. Of course, the memory installed must
allow 1 cycle R/W. The server tries to avoid problems with high 
dotclocks, limiting the maximum based on estimated memory bandwidth.
Overriding the limits with dac_speed and modelines can damage the 
card if you exceed the card limits. Values between driver guess and
chipset limits are acceptable, but can cause bad image quality, noise 
or no image displayed. 
<ul>
<li>SiS recommended video modes for 6326: </li>
<li>   640x480  : 4, 8, 15, 16, 24 bpp at 85Hz Non-interlaced</li>
<li>   800x600  : 4, 8, 15, 16, 24 bpp at 85Hz Non-interlaced </li>
<li>  1024x768  : 4, 8, 15, 16, 24 bpp at 85Hz Non-interlaced</li>
<li> 1280x1024  : 4, 8, 15, 16, 24 bpp at 75Hz Non-interlaced</li>
<li> 1600x1200  : 4, 8  bpp at 65Hz Non-interlaced</li>
</ul>
	 </li>
</ul>
</p>

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<A HREF="SiS.html"><EM> Information for SiS Users</EM></A>
 <b>:</b> <EM>Modelines </EM><BR>
<b>Previous:</b> <A HREF="SiS3.html"><EM>XF86Config Options </EM></A><BR>
<b>Next:</b> <A HREF="SiS5.html"><EM>Troubleshooting </EM></A>



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