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Date:      Sun, 22 May 2016 17:44:03 +0200
From:      Baptiste Daroussin <bapt@FreeBSD.org>
To:        Neel Chauhan <neel@neelc.org>
Cc:        freebsd-x11@freebsd.org
Subject:   Re: 4.6 DRM/i915 update CFT (Sandy Bridge?)/IvyBridge/Haswell/Broadwell/SkyLake/KabyLakesupported
Message-ID:  <20160522154403.GB11189@ivaldir.etoilebsd.net>
In-Reply-To: <1463930362.997.1@mail.neelc.org>
References:  <1463930362.997.1@mail.neelc.org>

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On Sun, May 22, 2016 at 11:19:22AM -0400, Neel Chauhan wrote:
> UPDATE: Broadwell actually does work on my laptop, and quite well,=20
> provided that I don't use this line in the X.Org config:
> 	Option "AccelMethod" "sna"
>=20
> Probably this line in the X.Org config is causing issues.
>=20
> If I load i915kms and don't use xinit/startx, the console is still=20
> slow. But if I run xinit/startx, the performance is good. Also, if I=20
> leave X.Org and go back to the console, the slow console is not there.
>=20
Same here but if you look at top you will see xorg eating 100% CPU in fact =
this
is the module complaining about local_irq_enable/local_irq_disable all the =
time.

Removing the printf from UNIMPLEMENTED() in there (so the printf) fixes the
issue.

In my case everyting is working but xv extension

Considering xrandr I have small artefacts when using multiple screen, but s=
till
usable

if I activate sna, it is totally broken

if I use newer xorg along with newer xf86-video-intel from ports-graphics r=
epo
- with uxa: works but full of artefacts everywhere, unusable
- with sna: instant panic

concerning vt:
- it is always slow and not related to the debug option being on by default=
 in
  the driver
- multiple screens do work
- when using a secondary screen (DP in my case) the secondary screen is fas=
ter
  that the main screen

Thanks for the work, that said with current xorg and current xf86-video-int=
el
using uxa it is perfectly usable, thanks a lot!

Best regards,
Bapt

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