linux-kernel - Re: fb layer & ioremap

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Message-Id: <200806131842.16619.elendil@planet.nl>
Date:	Fri, 13 Jun 2008 18:42:15 +0200
From:	Frans Pop <elendil@...net.nl>
To:	Jesse Barnes <jesse.barnes@...el.com>
Cc:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	linux-kernel@...r.kernel.org, "Ingo Molnar" <mingo@...e.hu>,
	"Packard, Keith" <keith.packard@...el.com>,
	"Yinghai Lu" <yhlu.kernel@...il.com>,
	linux-fbdev-devel@...ts.sourceforge.net
Subject: Re: fb layer & ioremap_wc

On Monday 05 May 2008, Jesse Barnes wrote:
> On Monday, May 05, 2008 11:59 am Frans Pop wrote:
> > On Monday 05 May 2008, you wrote:
> > > On Monday, May 05, 2008 10:32 am Frans Pop wrote:
> > > > I suspect it could be vesafb/fbcon related instead. Normally I
> > > > boot my system with 'quiet vga=791', i.e. with vesafb. I then see
> > > > the artifacts.
> > > >
> > > > When I boot with 'video=vfb:off', I do _not_ get the artifacts
> > > > when X exits.
> > >
> > > Ahhh, I missed that part of your config.  That could definitely
> > > have an effect on things...  You'll probably want something like
> > > the attached
> >
> > Not sure what to make of this.
> > With your patch I still get the artifacts, but they are displayed a
> > lot shorter. I get only a flash instead of a-2 seconds.
>
> Hm, so I guess some other user is still using UC on the region.  [Note
> to fb list:  the patch just made vesafb use ioremap_wc instead of
> ioremap).

AFAIK there has been no progress on this issue, which is now listed on the 
regression list for .26 [1]. As there has been no response from any fb 
devs, is someone else maybe willing to have a closer look at this?

I'm still seeing the artifacts with -rc6 and the severity seems to depend 
on what was last displayed: sometimes the whole display is covered with 
colored nonsense, artistic maybe but not desired...

Cheers,
FJP

[1] http://bugzilla.kernel.org/show_bug.cgi?id=10843
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