linux-kernel - Re: Bad flicker on skylake HQD due to code in the 4.7 merge window

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Message-ID: <1466111747.2311.1.camel@HansenPartnership.com>
Date:	Thu, 16 Jun 2016 14:15:47 -0700
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Jani Nikula <jani.nikula@...ux.intel.com>,
	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>
Subject: Re: Bad flicker on skylake HQD due to code in the 4.7 merge window

On Mon, 2016-06-13 at 13:14 +0300, Jani Nikula wrote:
> On Tue, 31 May 2016, James Bottomley <
> James.Bottomley@...senPartnership.com> wrote:
> > On Tue, 2016-05-31 at 10:51 +0300, Jani Nikula wrote:
> > > On Mon, 30 May 2016, James Bottomley <
> > > James.Bottomley@...senPartnership.com> wrote:
> > > > I've tested a pristine 4.6.0 system, so it's definitely
> > > > something
> > > > that
> > > > went in during the merge window.  The flicker isn't continuous,
> > > > it's
> > > > periodic, with an interval of something like 2-5 seconds.  It
> > > > looks
> > > > like an old analogue TV going out of sync and then resyncing. 
> > > >  I've
> > > > attached the dmesg and X.org log below just in case they can
> > > > help. 
> > > >  I
> > > > might be able to bisect this next week, but, unfortunately,
> > > > this is
> > > > my
> > > > current laptop and I'm travelling this week.
> > > 
> > > Please try i915.enable_psr=0 module parameter.
> > 
> > Makes no discernable difference.  Current parameter settings are:
> 
> Sorry for the silence. Would you mind trying out drm-intel-nightly
> branch of [1]?
> 
> BR,
> Jani.
> 
> [1] http://cgit.freedesktop.org/drm-intel

No, flicker is still there (and in fact seems worse) with the tree with
this commit at the top:

commit 3eb202ecc3668583f9ff4338211dbab47d755d1c
Author: Daniel Vetter <daniel.vetter@...ll.ch>
Date:   Thu Jun 16 14:38:54 2016 +0200

    drm-intel-nightly: 2016y-06m-16d-12h-38m-37s UTC integration
manifest

James