linux-kernel - Re: [Intel-gfx] Linux 3.16-rc2

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Message-ID: <20140624115753.GD17674@nuc-i3427.alporthouse.com>
Date:	Tue, 24 Jun 2014 12:57:53 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Jani Nikula <jani.nikula@...ux.intel.com>
Cc:	Thomas Meyer <thomas@...3r.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-gfx] Linux 3.16-rc2

On Tue, Jun 24, 2014 at 02:06:24PM +0300, Jani Nikula wrote:
> On Tue, 24 Jun 2014, Thomas Meyer <thomas@...3r.de> wrote:
> > the i915 driver is still broken in 3.16-rc2. Resume from ram crashes the
> > X server.
> 
> This is not new to 3.16-rc2; apparently we've had it since v3.15-rc4
> [1]. Also related [2].
> 
> Chris, any fresh ideas?

Nope. The bug is https://bugs.freedesktop.org/show_bug.cgi?id=76554
everything we know and have tried is there. Which is not much more than
at time of the original incarnation:

commit 50aa253d820ad4577e2231202f2c8fd89f9dc4e6
Author: Keith Packard <keithp@...thp.com>
Date:   Tue Oct 14 17:20:35 2008 -0700

    i915: Fix up ring initialization to cover G45 oddities
    
    G45 appears quite sensitive to ring initialization register writes,
    sometimes leaving the HEAD register with the START register contents. Check
    to make sure HEAD is reset correctly when START is written, and fix it up,
    screaming loudly.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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