From: Branden Robinson <branden@debian.org>
To: Sven Luther <sven.luther@wanadoo.fr>
Cc: Clint Adams <schizo@debian.org>,
226973@bugs.debian.org, Geert Uytterhoeven <geert@linux-m68k.org>,
Linux Frame Buffer Device Development
<linux-fbdev-devel@lists.sourceforge.net>
Subject: Re: Bug#226973: Re: Bug#226973: xserver-xfree86: [glint] second card at wrong resolution
Date: Thu, 1 Apr 2004 11:41:06 -0500 [thread overview]
Message-ID: <20040401164106.GB17894@deadbeast.net> (raw)
In-Reply-To: <20040401065102.GB637@lambda>
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On Thu, Apr 01, 2004 at 08:51:02AM +0200, Sven Luther wrote:
> On Thu, Apr 01, 2004 at 01:41:22AM -0500, Branden Robinson wrote:
> > On Wed, Mar 31, 2004 at 11:10:02AM -0500, Clint Adams wrote:
> > > > If your graphics controller is limited by memory bandwidth, the maximum pixel
> > > > clock depends on the number of bits per pixels, since larger pixels mean more
> > > > memory bandwidth.
> > >
> > > I'm unclear on the differences between 24 bpp and 32 bpp and how this
> > > relates to internal pixmap format.
> >
> > Some hardware uses a "packed-pixel format"; that is, 4 24-bit pixels are
> > encoded in 3 32-bit words (what Intel calls "DWORDS", I think).
>
> Yeah, DWORDS, because they are stil living in the era of 16bit hardware :)
>
> > Other hardware tosses in a zero byte with every 32-bit "DWORD" transfer.
>
> Well, the permedia2 should support both formats, depending on chosen
> mode.
Well, maybe this is what is going on. Maybe Solaris is using a
packed-pixel format, and XFree86 is using zero-padded format.
That is, assuming it's the RAMDAC's job to understand the pixel format,
and that some part isn't stuck in front of it to give it a standardized
format. I wouldn't know.
--
G. Branden Robinson | That's the saving grace of humor:
Debian GNU/Linux | if you fail, no one is laughing at
branden@debian.org | you.
http://people.debian.org/~branden/ | -- A. Whitney Brown
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prev parent reply other threads:[~2004-04-01 16:41 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20040109163119.GA10151@scowler.net>
[not found] ` <20040112121558.GA24511@iliana>
[not found] ` <20040112215543.GB2150@scowler.net>
2004-01-13 7:41 ` Bug#226973: xserver-xfree86: [glint] second card at wrong resolution Sven Luther
2004-01-13 15:40 ` Clint Adams
2004-01-13 16:02 ` Sven Luther
2004-01-14 21:06 ` Clint Adams
2004-01-14 21:12 ` Sven Luther
2004-01-14 21:17 ` Clint Adams
2004-01-14 21:12 ` Clint Adams
2004-01-14 21:16 ` Sven Luther
2004-01-15 21:55 ` Clint Adams
2004-01-15 22:47 ` Clint Adams
2004-03-30 15:32 ` Clint Adams
2004-03-30 16:57 ` Sven Luther
2004-03-30 23:02 ` Clint Adams
2004-03-30 23:08 ` Sven Luther
2004-03-31 8:12 ` Geert Uytterhoeven
2004-03-31 16:10 ` Clint Adams
2004-04-01 6:41 ` Bug#226973: " Branden Robinson
2004-04-01 6:51 ` Sven Luther
2004-04-01 16:41 ` Branden Robinson [this message]
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