Re: 2.6.35-rc6+: i915: Bisected regression

From: Stefan Richter
Date: Sun Aug 01 2010 - 07:43:11 EST

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