linux-kernel - Re: [Linux-fbdev-devel] 2.6.19-rc4-mm2

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Message-ID: <Pine.LNX.4.62.0611080259340.28657@pademelon.sonytel.be>
Date:	Wed, 8 Nov 2006 03:01:34 +0100 (CET)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Linux Frame Buffer Device Development 
	<linux-fbdev-devel@...ts.sourceforge.net>
cc:	ajwade@...mni.uwaterloo.ca, Andrew Morton <akpm@...l.org>,
	Kimball Murray <kimball.murray@...il.com>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: Re: [Linux-fbdev-devel] 2.6.19-rc4-mm2

On Tue, 7 Nov 2006, Richardson, Charlotte wrote:
> If I can't repro it with this chip, if you want to mess around with it
> on yours, here's what I think we had to do... I believe the trick was
> to use 16bpp mode as far as what mode you write to the chip, and then
> double all the x coordinate values for things like offset, width, and
> pitch. You would have to do that to the accelerated routines also.

> > From: Andrew Wade [mailto:andrew.j.wade@...il.com]
> > On 11/6/06, Richardson, Charlotte <Charlotte.Richardson@...atus.com>
> > wrote:
> > ...
> > > How much is each line offset when you have the garbled stuff? I
> mean,
> > > is it a couple pixels, half the total width, something else? And is
> > > it always the same for each line (or can you tell)?
> > 
> > Each ghost is 1/3 of a screen horizontally from the other ghosts. I've
> > been looking carefully at test patterns to figure out what is going
> on.

Since the ghosts are 1/3 of a screen apart and not 1/2...

If this is similar to the old Mach64, for 24-bit you have to use 8-bit mode and
multiply all horizontal values by _3_.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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