linux-kernel - Re: staging: udlfb -- staging version does not work, external does

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Message-ID: <20100411150718.GA1401@ucw.cz>
Date:	Sun, 11 Apr 2010 17:07:18 +0200
From:	Pavel Machek <pavel@....cz>
To:	Bernie Thompson <bernie@...gable.com>
Cc:	roberto@...it.it, gregkh@...e.de, Cyril Hrubis <metan@....cz>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: staging: udlfb -- staging version does not work, external does

Hi!

> Thanks for the bug report!

You are welcome :-).

> > I tried getting udlfb to work in 2.6.34-rc*, and could not.
> 
> What CPU arch are you on, and is it 32 or 64?

32bit Intel Core Duo.

> > 1) it hates vga console. If text-mode vga console is used (not
> > vesafb), system dies immeditaly during insmod or during boot if
> > monolithic kernel is used.
> 
> It is a kernel oops? Where does the crash happen?  Can you email any
> udlfb-specific output in logs (especially /var/log/kern.log)?

It just locks :-(.

> > 2) it does not display anything. With vesafb, it will not lockup the
> > system, and /dev/fb1 is created... Unfortunately, all I get is green
> > screen.
> 
> The green screen means udlfb has initialized device and started
> rendering.   So what this likely means is everything is fine -- just
> fbcon has matched against fb0, which is why it's not using the fb1
> udlfb screen.

Yep, but I still should be able to produce output on it.

> > (I tried testing with cat /bin/bash > /dev/fb1 and cat /dev/fb0 >
> > /dev/fb1).
> 
> I don't think redirects like that will work.  The fbcon module loads
> against one fb, and can only be switch with utilities like "fbset"

IMO they should work. First one should fill the screen with ~random
noise, and second should copy graphical representation on fb0 to
fb1. If they have same resolution and color depth, I should be looking
at copy of my console...

(And it does work with this driver:

> > So I tried
> >
> >    Roberto De Ioris roberto at unbit.it
> >    Wed Jun 10 08:00:07 PDT 2009 

).

								Pavel

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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