Re: LCD sync rates
> Scraper wrote:
>
> > As far as I know all laptops use a 60 Hz refresh frequentie. At least
> > the ones I've seen so far.
>
>
> More to the point, all LCD displays use a 60 Hz refresh frequency. You
> should be able to create modelines for your screen using the modeline
> package (apt-get is your friend).
>
>
> LCD displays are extremely picky regarding the modelines you feed them,
It can also depend on the server you select. In my experience with the
Compal 30W (aka Dell Inspiron 5000, Tuxtops Premium, QLItech Emperor, etc)
it worked quite differently with SVGA server, vs. with ATI accelerated
server. (too bad I can't remember which way was which, but...) In one,
if you weren't as close as you could get to 64.14, tough cookies, no video.
(It was okay with 65 at least, so I could use calculators to get some decent
lines.) The other way, it seemed to work with a normal setup of items.
Perhaps there should be a DotclockRange widget to go in, optionally replacing
HorizSync and VertRefresh? Because I could use fairly insane Horiz and Vert
values as long as the Dotclock was met using that picky server.
> and the slightest variation can result in a black screen when your start
> the X server.
I recommend having your net connection live and be ssh'd in from another box.
That keeps you a visible text session.
You can sometimes use a different GUI utility (e.g. SVGAlib app, or vga_reset
or something) to reinit the video and keep working without having to reboot
to yank its chain.
> I had the problem with the 1400x1050 resolution on my Dell
> Latitude C800 until I found a working modeline on the web. Surprisingly
> enough, the modeline I'm now using isn't exactly the one calculated by
> the modeline package for a 60 Hz display, but corresponds more or less
> to 56-57 Hz. I'll have to make some more testing, I guess ...
It does sometimes happen that you get best behavior from something a shave
below the highest range.
* Heather Stern * star@ many places...
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