Video Timing Method

If all of the previously described methods fail for your configuration, it is possible to specify the exact timing numbers for a particular resolution. The last method for setting the screen resolution also uses nvedit. This method is more involved and requires knowledge of all timing parameters for the desired resolution. Therefore, this method is only meant for monitors whose resolutions are not available in the Video-Mode Method. See "Using nvedit to Modify NVRAM" for a description of nvedit commands.

You should use this method only if the previous methods have been unsuccessful.

For example, to set the screen resolution to 1280 x 1024 at 76 Hz:

ok nvedit
 0: : video-timing " 1280, 384, 32, 64, \
		1024, 43, 3, 8, 135000000, 0" ;
 1:	<ctrl-c>
ok nvstore
ok setenv use-nvramrc? true
ok reset

The syntax is very important. The spaces must be present exactly as they appear in the example.

The last three commands enable the NVRAM. Without these lines, the changes you make with nvedit will be ignored.

Following is a brief description of the ten parameters used in this method.

• horizontal resolution (in pixels)

• horizontal blanking total

• horizontal front porch

• horizontal sync width

• vertical resolution (in lines)

• vertical blanking total

• vertical front porch

• vertical sync width

• dotclock in Hz

• sync value (see Table 6-4). Add the values together to select more than one.

To obtain the timing parameters required to use this method, contact SunService at 1-800-USA-4SUN with your monitor requirements.