linux-kernel - Re: [PATCH] Intel FB pixel clock calculation fix

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Message-ID: <20071026175143.GB1573@elf.ucw.cz>
Date:	Fri, 26 Oct 2007 19:51:43 +0200
From:	Pavel Machek <pavel@....cz>
To:	Krzysztof Halasa <khc@...waw.pl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	sylvain.meyer@...ldonline.fr, linux-kernel@...r.kernel.org,
	"Antonino A. Daplas" <adaplas@....net>,
	linux-fbdev-devel@...ts.sourceforge.net
Subject: Re: [PATCH] Intel FB pixel clock calculation fix

On Tue 2007-09-11 14:18:57, Krzysztof Halasa wrote:
> Andrew Morton <akpm@...ux-foundation.org> writes:
> 
> >> Intel framebuffer mis-calculated pixel clocks.
> 
> > and... what are the consequences of this miscalculation?  I need to know
> > such things so that I can decide whether a change is needed in 2.6.23.  And
> > 2.6.22.
> 
> The pixel clock (and thus both H and V sync) will be slower than
> requested, so if you set the minimum allowed the display may not
> sync. In case of really old CRT display it could theoretically
> damage it.
> 
> I'm using it with PAL TV (using RGB input - SCART connector) and
> the bug prevented it from working at all (TV requirements are more
> strict and made the bug visible).
> 
> I think 2.6.22 would be overkill, .23 - not sure.

I don't think this is -stable kind of bug.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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