Re: [Intel-gfx] [PATCH 1/2] drm/i915: Try to use fast+narrow link on eDP again and fall back to the old max strategy on failure

From: Albert Astals Cid <aacid@kde.org>
To: "Ville Syrjälä" <ville.syrjala@linux.intel.com>,
	"Emanuele Panigati" <ilpanich@gmail.com>
Cc: Matteo Iervasi <matteoiervasi@gmail.com>,
	Jani Nikula <jani.nikula@intel.com>,
	intel-gfx@lists.freedesktop.org,
	Kai-Heng Feng <kai.heng.feng@canonical.com>
Subject: Re: [Intel-gfx] [PATCH 1/2] drm/i915: Try to use fast+narrow link on eDP again and fall back to the old max strategy on failure
Date: Mon, 10 May 2021 20:06:40 +0200	[thread overview]
Message-ID: <3349345.6yYDney9BF@xps> (raw)
In-Reply-To: <CABpPkAEVbSUwoBqXDaKpckbfkq4-z=MWNC27JYOLki3FhN0PyA@mail.gmail.com>

Yes, I also have the same.

I git bisected that and found this to be the cause, i started a new email thread because i couldn't find this email ^_^

Cheers,
  Albert

El dilluns, 10 de maig de 2021, a les 10:07:33 (CEST), Emanuele Panigati va escriure:
> Hi,
>   on my Dell XPS 15 9570 laptop I might have a regression with Arch Linux
> (kernel 5.12.2-arch1-1: during boot the laptop monitor goes black while
> external monitors still works...
> 
> 
> Panich
> 
> 
> Il giorno lun 11 gen 2021 alle ore 19:28 Ville Syrjälä <
> ville.syrjala@linux.intel.com> ha scritto:
> 
> > On Thu, Jan 07, 2021 at 08:20:25PM +0200, Ville Syrjala wrote:
> > > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > >
> > > Some new eDP panels don't like to operate at the max parameters, and
> > > instead we need to go for an optimal confiugration. That unfortunately
> > > doesn't work with older eDP panels which are generally only guaranteed
> > > to work at the max parameters.
> > >
> > > To solve these two conflicting requirements let's start with the optimal
> > > setup, and if that fails we start again with the max parameters. The
> > > downside is probably an extra modeset when we switch strategies but
> > > I don't see a good way to avoid that.
> > >
> > > For a bit of history we first tried to go for the fast+narrow in
> > > commit 7769db588384 ("drm/i915/dp: optimize eDP 1.4+ link config
> > > fast and narrow"). but that had to be reverted due to regression
> > > on older panels in commit f11cb1c19ad0 ("drm/i915/dp: revert back
> > > to max link rate and lane count on eDP"). So now we try to get
> > > the best of both worlds by using both strategies.
> >
> > Pushed. Fingers crossed for no regressions...
> >
> > --
> > Ville Syrjälä
> > Intel
> >
> 

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