Re: 2.6.35-rc6+: i915: Bisected regression

From: Shuang He
Date: Thu Aug 05 2010 - 01:43:29 EST

On 2010-8-1 18:51, Thomas Meyer wrote:
Am 01.08.2010 um 13:42 schrieb Stefan Richter<stefanr@xxxxxxxxxxxxxxxxx>:

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
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.

Could you help report a bug for this issue by following


Stefan Richter
-=====-==-=- =--- ----=
dri-devel mailing list

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at