linux-kernel - Re: 2.6.35-rc6+: i915: Bisected regression

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Message-ID: <4C555DA0.6020109@s5r6.in-berlin.de>
Date:	Sun, 01 Aug 2010 13:42:24 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Thomas Meyer <thomas@...3r.de>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Zou Nan hai <nanhai.zou@...el.com>,
	Xiang Hai hao <haihao.xiang@...el.com>,
	Eric Anholt <eric@...olt.net>, David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org
Subject: Re: 2.6.35-rc6+: i915: Bisected regression

Thomas Meyer wrote:
> This commit makes suspend to ram unreliable for me:
> 
> commit d1b851fc0d105caa6b6e3e7c92d2987dfb52cbe0
> Author: Zou Nan hai <nanhai.zou@...el.com>
> Date:   Fri May 21 09:08:57 2010 +0800
> 
>     drm/i915: implement BSD ring buffer V2
>     
>     The BSD (bit stream decoder) ring is used for accessing the BSD engine
>     which decodes video bitstream for H.264 and VC1 on G45+.  It is
>     asynchronous with the render ring and has access to separate parts of
>     the GPU from it, though the render cache is coherent between the two.
>     
>     Signed-off-by: Zou Nan hai <nanhai.zou@...el.com>
>     Signed-off-by: Xiang Hai hao <haihao.xiang@...el.com>
>     Signed-off-by: Eric Anholt <eric@...olt.net>
> 
> git revert didn't work on 2.6.35-rc6 so I just changed the HAS_BSD thing to:
> 
> #define HAS_BSD(dev)            (0)
> 
> with this change applied suspend to ram is back to the reliability of 2.6.34.y
> 
> with kind regards
> thomas

Added CCs.

Thomas, on what hardware did you observe the regression?  Is it suspend
or resume that is unreliable?  What are the particular symptoms --- does
not suspend, crashes during suspend, crashes during resume...?
-- 
Stefan Richter
-=====-==-=- =--- ----=
http://arcgraph.de/sr/
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