[Bug 63586] [HSW desktop] Resume from s4 causes call trace and system hang, with cool boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63586

--- Comment #13 from cancan,feng <cancan.feng at intel.com> ---
(In reply to comment #10)
> So just to check: This failure after 95 resume cycles was on a kernel
> previously considered good? I.e. do we need to assume that this bug has
> always been there and this is not a regression, just some timing changes
> made it more likely?

Hi, I have double checked this issue, and found it is a regression, and I have
bisected it. Here is bisect information:

88adfff1ad5019f65b9d0b4e1a4ac900fb065183 is the first bad commit
commit 88adfff1ad5019f65b9d0b4e1a4ac900fb065183
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Thu Mar 28 10:42:01 2013 +0100

    drm/i915: hw readout support for ->has_pch_encoders

    Now we can ditch the checks in the Haswell disable code.

    v2: add support for Haswell

    Reviewed-by: Jesse Barnes <jbarnes at virtuousgeek.org>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

:040000 040000 3680d704a4f13869e0e5094699a9c96dcf7dc45b
78d850e8e904670ad377fc92b75993dfec59933a M      drivers

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