linux-kernel - Re: [REGRESSION] i915 KMS dual head broken on DELL latitude E6420 in 3.1-rc*

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Message-ID: <20110915081259.GB4877@type.bordeaux.inria.fr>
Date:	Thu, 15 Sep 2011 10:12:59 +0200
From:	Samuel Thibault <samuel.thibault@...-lyon.org>
To:	Keith Packard <keithp@...thp.com>, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] i915 KMS dual head broken on DELL latitude E6420 in
 3.1-rc*

Samuel Thibault, le Thu 15 Sep 2011 09:41:06 +0200, a écrit :
> Keith Packard, le Thu 15 Sep 2011 00:43:36 -0500, a écrit :
> > On Thu, 15 Sep 2011 01:27:17 +0200, Samuel Thibault <samuel.thibault@...-lyon.org> wrote:
> > Non-text part: multipart/mixed
> > > I'm trying to upgrade from 3.0 to 3.1-rcsomething on a DELL latitude
> > > E6420, but dual head is broken. Here is the scenario:
> > > 
> > > - Turn computer on with VGA1 connected. Both LVDS1 and VGA1 show the
> > >   text console fine.
> > > - Start X. VGA1 shows X fine, but LVDS1 (1600x900 resolution) shows an
> > >   odd screen: completely black on the left part (about 1060x900), sort
> > >   of gray on the right part (about 540x900). Playing with xrandr doesn't
> > >   help, I can at best make it completely black with --off, and not get
> > >   it back again with --auto or anything else.
> > 
> > Can you try disabling frame buffer compression?
> > 
> > i915.i915_enable-fbc=0
> > 
> > I'm about to send a patch to disable this by default; I've gotten two
> > people saying that this helps them already.
> 
> Absolutely. I have no issue any more, and the error messages are gone.

At home only. At work, with a different VGA screen, I'm still getting
the issue.

Samuel

View attachment "dmesg.bad" of type "text/plain" (62080 bytes)

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View attachment "Xorg.0.log.good" of type "text/plain" (39759 bytes)