Re: XF86Config-4 for 266 MHz iMac
On Sun, Apr 28, 2002 at 07:03:42PM -0500, Branden Robinson wrote:
> On Sun, Apr 28, 2002 at 12:55:52PM -0700, Chris Tillman wrote:
> > I just submitted a bug to xserver-xfree86 regarding this. The xserver's
> > calculations seem to be at odds with the iMac's philosophy.
> >
> > Anyway, what I've found and waht has worked for people on the list, is
> > that the hsync has to be right around 60. So make the hsync 59-63,
> > that should get something going.
>
> Yes, but there are two VESA standard modelines with an hsync of 60.0kHz:
>
> # 1024x768 @ 75Hz (VESA) hsync: 60.0kHz
> ModeLine "1024x768" 78.8 1024 1040 1136 1312 768 769 772 800 +hsync +vsync
>
> # 1280x960 @ 60Hz (VESA) hsync: 60.0kHz
> ModeLine "1280x960" 108.0 1280 1376 1488 1800 960 961 964 1000 +hsync +vsync
>
> Why don't these work?
>
> (I have only skimmed your very long bug report so far, sorry.)
>
> --
> G. Branden Robinson | Convictions are more dangerous
> Debian GNU/Linux | enemies of truth than lies.
> branden@debian.org | -- Friedrich Nietzsche
> http://people.debian.org/~branden/ |
That explains it. The xserver is looking for VESA modes, and apparently
the iMac is non-VESA for 640x480 and 800x600.
Here's the modeline that works for 800x600 (has to be specified
as a modeline AFAICT, xserver won't pick it):
(**) R128(0): Mode "800x600": 63.0 MHz, 60.1 kHz, 95.3 Hz
(II) R128(0): Modeline "800x600" 63.00 800 832 896 1048 600 601 604 631 +hsync +vsync
I _do_ get 1024x768 and 1280x960 OK, but only if I restrict the hsync.
If I leave the range open more than a couple kHz around 60, xserver
picks another (non-60kHz) mode. Here's one from the bug report you
mentioned, that xserver picks but doesn't work:
(**) R128(0): Default mode "1024x768": 94.5 MHz, 68.7 kHz, 85.0 Hz
(II) R128(0): Modeline "1024x768" 94.50 1024 1072 1168 1376 768 769 772 808 +hsync +vsync
The xserver seems to prefer keeping the vsync around 75-85, while
the Mac demands the hsync be kept constant at 60.
--
*------v--------- Installing Debian GNU/Linux 3.0 --------v------*
| <http://www.debian.org/releases/woody/installmanual> |
| debian-imac (potato): <http://debian-imac.sourceforge.net> |
| Chris Tillman tillman@voicetrak.com |
| May the Source be with you |
*----------------------------------------------------------------*
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