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DateSun, 13 Nov 2005 11:23:21 +0100
FromMartin Mares <>
SubjectRe: [PATCH] vgacon: Workaround for resize bug in some chipsets
Hello!

> Reported from Redhat Bugzilla Bug 170450> > "I updated to the development kernel and now during boot only the top of the
> text is visable. For example the monitor screen the is the lines and I can
> only  see text in the asterik area.> ---------------------> | ****************  |> | *              *  |> | *              *  |> | ****************  |> |                   |
> |                   |
> |                   |> ---------------------> > I have a Silicon Graphics 1600sw LCD panel with a Number Nine Revolution 4
> video card."> > This bug seems to be a glitch in the VGA core of this chipset.  Resizing
> the screen triggers the mentioned bug.> > The workaround is to make vgacon avoid calling vgacon_doresize() if the
> display parameters did not change. It also has a nice side effect of faster
> console switches, but that will be barely noticeable.

This patch really deserves a comment in the code that such a broken hardware
exists.

Also, I don't see much reasons for introducing VGA_FONTWIDTH, it seems to only
complicate the code.

				Have a nice fortnight
-- 
Martin `MJ' Mares   <mj@ucw.cz>   http://atrey.karlin.mff.cuni.cz/~mj/
Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth
For every complex problem, there's a solution that is simple, neat and wrong.
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