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

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Date:	Sun, 1 Aug 2010 12:51:36 +0200
From:	Thomas Meyer <thomas@...3r.de>
To:	Stefan Richter <stefanr@...6.in-berlin.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" <dri-devel@...ts.freedesktop.org>
Subject: Re: 2.6.35-rc6+: i915: Bisected regression

Am 01.08.2010 um 13:42 schrieb Stefan Richter <stefanr@...6.in-berlin.de>:

> 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 a Intel mobile express gm45 chipset.

>  Is it suspend
> or resume that is unreliable?

suspend never finishes/hangs.

>  What are the particular symptoms --- does
> not suspend, crashes during suspend, crashes during resume...?

Does not suspend, backlight is on.

> -- 
> Stefan Richter
> -=====-==-=- =--- ----=
> http://arcgraph.de/sr/
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