Re: [Linux-fbdev-devel] Fixed-frequency monitor, and G45 se

[Carlo E. P. <fl...@fl...>]

	Subject: Re: [Linux-fbdev-devel] Fixed-frequency monitor, and G45 se
	Date: Fri, Oct 26, 2001 at 12:52:13AM +0000

Quoting Petr Vandrovec (VAN...@vc...):

> Well, documentation says that it is possible, but I thought that nobody
> uses interlaced picture now... If you want to do some experiments, you
> can try:
> 
> (0) make sure that yres+upper+lower+vslen is odd
> (1) set bit 25 (0x02000000) in register 0x3C10 (== enable interlace)
> (2) program register 0x3C28 with start of even field (== leave current value)
> (3) program register 0x3C2C with start of odd field (== 0x3C28+vxres*bpp/8)
> (4) program register 0x3C40 with value twice as large as currently
>     (== line offset)
> 
> and you'll see. I'm not sure whether step (4) is needed or not, documentation
> is not clear on this.

First of all thanks. I won't be able to experiment on this for at
least 1 week. But I would like your advice about how best to
proceed. I mean, can these values be changed at will, or once at the
loading of the module? Is it wise to just set the second screen to
interlace at the beginning (possibly with a module parameter) or to
switch to/from interlace with some sort of ioctl?

> If you'll manage to create patch, please send it to me.

I will. 

Carlo

-- 
  *         Se la Strada e la sua Virtu' non fossero state messe da parte,
* K * Carlo E. Prelz - fl...@fl...             che bisogno ci sarebbe
  *               di parlare tanto di amore e di rettitudine? (Chuang-Tzu)