2.6.35-rc6+: i915: Bisected regression

Thomas Meyer thomas at m3y3r.de
Sun Aug 1 03:51:36 PDT 2010

Am 01.08.2010 um 13:42 schrieb Stefan Richter <stefanr at s5r6.in-berlin.de>:

> Thomas Meyer wrote:
>> This commit makes suspend to ram unreliable for me:
>> commit d1b851fc0d105caa6b6e3e7c92d2987dfb52cbe0
>> Author: Zou Nan hai <nanhai.zou at intel.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 at intel.com>
>>    Signed-off-by: Xiang Hai hao <haihao.xiang at intel.com>
>>    Signed-off-by: Eric Anholt <eric at anholt.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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