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Re: Flickering screen on a cinema display.

Le Fri, Apr 27, 2007 at 10:22:21PM -0400, Wakko Warner a écrit :
> Charles Plessy wrote:
> > I have just installed Etch on a powermac7,3 with a cinema display, but
> > very unfortunately, the screen flickers, making it difficult to work
> > with the computer.
> > 
> > I have found a hint on the fglrx page
> > (http://www.stanchina.net/~flavio/debian/fglrx-installer.html): it seems
> > necessary to reduce the refreshing frequency of the screen. However, in
> > /etc/X11/xorg, there are two ranges of, horizontal and vertical, so I
> > do not know how to tell xorg to refresh at 50 Hz.
> > 
> > Did anybody experience the same problem and found a solution ?
> Yes, I had this with a radeon 9200 on a PC and a 1600x1200 LCD connected via
> DVI (Did not occur with VGA).  I had to tell xorg to ignore edid and I
> modified each mode line's dot clock to the absolute lowest it would go (down
> to 2 decimal places).  I still had flickering at 1600x1200.  I've since
> replaced it with a Fire GL X1 card and the flicker is completely gone.
> It seems to be the fact there's not enough bandwidth on a single link DVI
> cable.  I didn't have a dual link to test with so I'm not sure if that helps
> or not.

As everything works OK on osX, I wonder what kind of black magick is
used by Apple... My problem is that I can not ask for a new graphical
card just because I can not install linux on my work computer: working
with linux is more comfortable in some cases, but as anyway osX is
required for many things (flash, MS office, ...) so I can not justify
such spending :(

How did you tell xorg to ignore "edid" ?

Have a nice day,

Charles Plessy
Wako, Saitama, Japan

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