linux-kernel - Re: PROBLEM: Intel VGA output busticated on 4.3-rc2 (regression)

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Message-ID: <20151007190427.GQ26517@intel.com>
Date:	Wed, 7 Oct 2015 22:04:27 +0300
From:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:	Nick Bowler <nbowler@...conx.ca>
Cc:	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	intel-gfx@...ts.freedesktop.org
Subject: Re: PROBLEM: Intel VGA output busticated on 4.3-rc2 (regression)

On Wed, Oct 07, 2015 at 02:50:34PM -0400, Nick Bowler wrote:
> On 10/7/15, Ville Syrjälä <ville.syrjala@...ux.intel.com> wrote:
> > On Wed, Oct 07, 2015 at 10:29:22AM -0400, Nick Bowler wrote:
> >> On 10/7/15, Ville Syrjälä <ville.syrjala@...ux.intel.com> wrote:
> >> > On Tue, Oct 06, 2015 at 11:42:33AM -0400, Nick Bowler wrote:
> >> >> On 9/24/15, Nick Bowler <nbowler@...conx.ca> wrote:
> >> >> > Testing out 4.3-rc2, first thing I notice is that the VGA output is
> >> >> > not working.  Specifically, the display is continuously powering on
> >> >> > and off -- at no point is any image visible on the screen (I am
> >> >> > expecting to see the console output).  The display connected to the
> >> >> > HDMI output is working fine.
> >> [...]
> > I've attached two potential patches that might help. Can you give a try
> > to just patch 1, and if that alone doesn't help then both patches
> > together?
> 
> Patch #1: no change.
> Patch #1+#2: this works.

Cool. I can see similar effects when manually frobbing the register on
my 946GZ, except somehow it still manages to work without these
patches. Not quite sure why that is.

But anyway, I'll polish the patches a bit and send them out.

-- 
Ville Syrjälä
Intel OTC
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